diff --git a/src/Controller/CommunityController.php b/src/Controller/CommunityController.php
index 39ffa82..84735b3 100644
--- a/src/Controller/CommunityController.php
+++ b/src/Controller/CommunityController.php
@@ -49,7 +49,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function getCommunityHome(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), false, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), false, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -87,7 +87,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function getCommunitySettings(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), false, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), false, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -106,7 +106,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function getCommunityEdit(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -124,9 +124,9 @@ class CommunityController implements IAuthenticationRequired
             ]);
         }
 
-        $communityId = \Container::$request->query('communityId');
-        if ($communityId){
-            if (!$this->checkPermission($communityId, true, $community, $ownCommunityMember)) {
+        $communitySlug = \Container::$request->query('communitySlug');
+        if ($communitySlug){
+            if (!$this->checkPermission($communitySlug, true, $community, $ownCommunityMember)) {
                 return null;
             }
         } else {
@@ -145,7 +145,7 @@ class CommunityController implements IAuthenticationRequired
         $community->setName($name);
         \Container::$persistentDataManager->saveToDb($community);
 
-        if (!$communityId) {
+        if (!$communitySlug) {
             /**
             * @var User $user
             */
@@ -168,13 +168,13 @@ class CommunityController implements IAuthenticationRequired
         }
 
         return new JsonContent([
-            'redirect' => ['target' => \Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()])]
+            'redirect' => ['target' => \Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()])]
         ]);
     }
 
     public function getMembersEdit(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -186,7 +186,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function saveMember(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -225,7 +225,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function deleteMember(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -250,7 +250,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function getCurrenciesEdit(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -262,7 +262,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function saveCurrency(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -298,7 +298,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function deleteCurrency(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -324,7 +324,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function getCurrencyExchangeRates(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -345,7 +345,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function saveCurrencyExchangeRate(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -378,7 +378,7 @@ class CommunityController implements IAuthenticationRequired
 
     public function deleteCurrencyExchangeRate(): ?IContent
     {
-        if (!$this->checkPermission(\Container::$request->query('communityId'), true, $community, $ownCommunityMember)) {
+        if (!$this->checkPermission(\Container::$request->query('communitySlug'), true, $community, $ownCommunityMember)) {
             return null;
         }
 
@@ -415,12 +415,12 @@ class CommunityController implements IAuthenticationRequired
     }
 
     private function checkPermission(
-        int $communityId,
+        string $communitySlug,
         bool $needToBeOwner,
         ?Community &$community,
         ?CommunityMember &$ownCommunityMember): bool
     {
-        $community = $this->communityRepository->getById($communityId);
+        $community = $this->communityRepository->getBySlug($communitySlug);
         if ($community === null) {
             return false;
         }
diff --git a/src/Controller/TransactionController.php b/src/Controller/TransactionController.php
index 3f075c9..aafbea0 100644
--- a/src/Controller/TransactionController.php
+++ b/src/Controller/TransactionController.php
@@ -46,8 +46,8 @@ class TransactionController implements IAuthenticationRequired, ISecured
 
     public function authorize(): bool
     {
-        $communityId = \Container::$request->query('communityId');
-        $this->community = $this->communityRepository->getById($communityId);
+        $communitySlug = \Container::$request->query('communitySlug');
+        $this->community = $this->communityRepository->getBySlug($communitySlug);
         if ($this->community === null) {
             return false;
         }
diff --git a/src/Repository/CommunityRepository.php b/src/Repository/CommunityRepository.php
index a1b4c96..49f0568 100644
--- a/src/Repository/CommunityRepository.php
+++ b/src/Repository/CommunityRepository.php
@@ -8,4 +8,9 @@ class CommunityRepository
     {
         return \Container::$persistentDataManager->selectFromDbById($id, Community::class);
     }
+
+    public function getBySlug(string $slug): ?Community
+    {
+        return \Container::$persistentDataManager->selectFromDbBySlug($slug, Community::class);
+    }
 }
diff --git a/views/communities/community.php b/views/communities/community.php
index 8055113..b401d27 100644
--- a/views/communities/community.php
+++ b/views/communities/community.php
@@ -4,11 +4,11 @@
     <h2>
         <?= $community->getName() ?>
         <?php if ($editPermission): ?>
-            <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.edit')->generateLink(['communityId' => $community->getId()]) ?>">edit</a>]</span>
+            <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.edit')->generateLink(['communitySlug' => $community->getSlug()]) ?>">edit</a>]</span>
         <?php endif; ?>
     </h2>
 
-    <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communityId' => $community->getId()]) ?>">Settings</a></p>
+    <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Settings</a></p>
 
     <div class="gridContainer marginTop">
         <div>
@@ -27,7 +27,7 @@
             $mainCurrencyRoundDigits = $community->getMainCurrency()->getRoundDigits();
             ?>
             <h3 class="marginBottom">Finances</h3>
-            <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId()]) ?>">Transactions</a>
+            <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Transactions</a>
             <table class="fullWidth marginTop">
                 <tr>
                     <td class="bold">You owe</td>
diff --git a/views/communities/community_currencies.php b/views/communities/community_currencies.php
index 2dc9dfa..7c09dbf 100644
--- a/views/communities/community_currencies.php
+++ b/views/communities/community_currencies.php
@@ -2,8 +2,8 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
-        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communityId' => $community->getId()]) ?>">Settings</a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Settings</a> »
         Edit currencies
     </h2>
     <div class="box compactBox">
@@ -18,8 +18,8 @@
             <?php foreach ($currencies as $currency): ?>
                 <tr>
                     <td>
-                        <form id="editCurrency_<?= $currency->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencies.edit-action')->generateLink(['communityId' => $community->getId(), 'currency_id' => $currency->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="code,round_digits"></form>
-                        <form id="deleteCurrency_<?= $currency->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencies.delete-action')->generateLink(['communityId' => $community->getId(), 'currency_id' => $currency->getId()]) ?>" method="post" data-reload-on-success="true"></form>
+                        <form id="editCurrency_<?= $currency->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencies.edit-action')->generateLink(['communitySlug' => $community->getSlug(), 'currency_id' => $currency->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="code,round_digits"></form>
+                        <form id="deleteCurrency_<?= $currency->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencies.delete-action')->generateLink(['communitySlug' => $community->getSlug(), 'currency_id' => $currency->getId()]) ?>" method="post" data-reload-on-success="true"></form>
                         <input type="text" form="editCurrency_<?= $currency->getId() ?>" class="text fullWidth" name="code" value="<?= $currency->getCode() ?>" maxlength="3" required>
                     </td>
                     <td>
@@ -35,7 +35,7 @@
             <?php endforeach; ?>
             <tr>
                 <td>
-                    <form id="newCurrency" action="<?= Container::$routeCollection->getRoute('community.currencies.new-action')->generateLink(['communityId' => $community->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="code,round_digits"></form>
+                    <form id="newCurrency" action="<?= Container::$routeCollection->getRoute('community.currencies.new-action')->generateLink(['communitySlug' => $community->getSlug()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="code,round_digits"></form>
                     <input type="text" form="newCurrency" class="text fullWidth" name="code" maxlength="3" required>
                 </td>
                 <td>
diff --git a/views/communities/community_edit.php b/views/communities/community_edit.php
index 9655d66..2f6f5bd 100644
--- a/views/communities/community_edit.php
+++ b/views/communities/community_edit.php
@@ -3,7 +3,7 @@
 @section(main)
     <h2>
         <?php if (isset($community)): ?>
-            <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
+            <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
             Edit
         <?php else: ?>
             New community
@@ -12,7 +12,7 @@
     <div class="box compactBox">
         <?php
         $formAction = isset($community) ?
-            Container::$routeCollection->getRoute('community.edit-action')->generateLink(['communityId' => $community->getId()]) :
+            Container::$routeCollection->getRoute('community.edit-action')->generateLink(['communitySlug' => $community->getSlug()]) :
             Container::$routeCollection->getRoute('community.new-action')->generateLink();
         ?>
         <form id="communityForm" action="<?= $formAction ?>" method="post" data-redirect-on-success="true">
diff --git a/views/communities/community_members.php b/views/communities/community_members.php
index 1bdbccc..0fcc42d 100644
--- a/views/communities/community_members.php
+++ b/views/communities/community_members.php
@@ -6,8 +6,8 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
-        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communityId' => $community->getId()]) ?>">Settings</a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Settings</a> »
         Edit members
     </h2>
     <div class="box compactBox">
@@ -23,8 +23,8 @@
                 <?php $editable = $member->getUserId() !== Container::$request->user()->getUniqueId(); ?>
                 <tr>
                     <td>
-                        <form id="editMember_<?= $member->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.members.edit-action')->generateLink(['communityId' => $community->getId(), 'community_member_id' => $member->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="owner"></form>
-                        <form id="deleteMember_<?= $member->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.members.delete-action')->generateLink(['communityId' => $community->getId(), 'community_member_id' => $member->getId()]) ?>" method="post" data-reload-on-success="true"></form>
+                        <form id="editMember_<?= $member->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.members.edit-action')->generateLink(['communitySlug' => $community->getSlug(), 'community_member_id' => $member->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="owner"></form>
+                        <form id="deleteMember_<?= $member->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.members.delete-action')->generateLink(['communitySlug' => $community->getSlug(), 'community_member_id' => $member->getId()]) ?>" method="post" data-reload-on-success="true"></form>
                         <?= $member->getUser()->getDisplayName() ?>
                     </td>
                     <td style="text-align: center;">
@@ -40,7 +40,7 @@
             <?php endforeach; ?>
             <tr>
                 <td>
-                    <form id="newMember" action="<?= Container::$routeCollection->getRoute('community.members.new-action')->generateLink(['communityId' => $community->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="user_id"></form>
+                    <form id="newMember" action="<?= Container::$routeCollection->getRoute('community.members.new-action')->generateLink(['communitySlug' => $community->getSlug()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="user_id"></form>
                     <select type="text" form="newMember" name="user_id">
                 </td>
                 <td style="text-align: center;">
diff --git a/views/communities/community_settings.php b/views/communities/community_settings.php
index 1708d67..bf1f49b 100644
--- a/views/communities/community_settings.php
+++ b/views/communities/community_settings.php
@@ -2,7 +2,7 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
         Settings
     </h2>
 
@@ -11,7 +11,7 @@
             <h3 class="marginBottom">
                 Members
                 <?php if ($editPermission): ?>
-                    <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.members')->generateLink(['communityId' => $community->getId()]) ?>">edit</a>]</span>
+                    <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.members')->generateLink(['communitySlug' => $community->getSlug()]) ?>">edit</a>]</span>
                 <?php endif; ?>
             </h3>
             <?php foreach ($members as $member): ?>
@@ -22,7 +22,7 @@
             <h3 class="marginBottom">
                 Currencies
                 <?php if ($editPermission): ?>
-                    <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.currencies')->generateLink(['communityId' => $community->getId()]) ?>">edit</a>]</span>
+                    <span class="small">[<a href="<?= Container::$routeCollection->getRoute('community.currencies')->generateLink(['communitySlug' => $community->getSlug()]) ?>">edit</a>]</span>
                 <?php endif; ?>
             </h3>
             <?php foreach ($currencies as $currency): ?>
@@ -30,7 +30,7 @@
                     <?php if ($currency->getId() === $community->getMainCurrencyId()): ?>
                         <b><?= $currency->getCode() ?></b>
                     <?php else: ?>
-                        <a href="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates')->generateLink(['communityId' => $community->getId(), 'code' => $currency->getCode()]) ?>"><?= $currency->getCode() ?></a>
+                        <a href="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates')->generateLink(['communitySlug' => $community->getSlug(), 'code' => $currency->getCode()]) ?>"><?= $currency->getCode() ?></a>
                     <?php endif; ?>
                 </p>
             <?php endforeach; ?>
diff --git a/views/communities/currency_exchange_rates.php b/views/communities/currency_exchange_rates.php
index 0fc62b9..abd5cb4 100644
--- a/views/communities/currency_exchange_rates.php
+++ b/views/communities/currency_exchange_rates.php
@@ -2,8 +2,8 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
-        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communityId' => $community->getId()]) ?>">Settings</a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community.settings')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Settings</a> »
         Exchange rates for <?= $currency->getCode() ?>
     </h2>
     <div class="box compactBox">
@@ -24,8 +24,8 @@
                 <tr>
                     <?php if ($editPermission): ?>
                         <td>
-                            <form id="editExchangeRate_<?= $currencyExchangeRate->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.edit-action')->generateLink(['communityId' => $community->getId(), 'code' => $currency->getCode(), 'currency_exchange_rate_id' => $currencyExchangeRate->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="exchange_rate,valid_from"></form>
-                            <form id="deleteCurrency_<?= $currencyExchangeRate->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.delete-action')->generateLink(['communityId' => $community->getId(), 'code' => $currency->getCode(), 'currency_exchange_rate_id' => $currencyExchangeRate->getId()]) ?>" method="post" data-reload-on-success="true"></form>
+                            <form id="editExchangeRate_<?= $currencyExchangeRate->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.edit-action')->generateLink(['communitySlug' => $community->getSlug(), 'code' => $currency->getCode(), 'currency_exchange_rate_id' => $currencyExchangeRate->getId()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="exchange_rate,valid_from"></form>
+                            <form id="deleteCurrency_<?= $currencyExchangeRate->getId() ?>" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.delete-action')->generateLink(['communitySlug' => $community->getSlug(), 'code' => $currency->getCode(), 'currency_exchange_rate_id' => $currencyExchangeRate->getId()]) ?>" method="post" data-reload-on-success="true"></form>
                             <input type="number" form="editExchangeRate_<?= $currencyExchangeRate->getId() ?>" class="text fullWidth" name="exchange_rate" value="<?= $currencyExchangeRate->getExchangeRate() ?>" min="0" step="0.000000001" required>
                         </td>
                         <td>
@@ -44,7 +44,7 @@
             <?php if ($editPermission): ?>
                 <tr>
                     <td>
-                        <form id="newExchangeRate" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.new-action')->generateLink(['communityId' => $community->getId(), 'code' => $currency->getCode()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="exchange_rate,valid_from"></form>
+                        <form id="newExchangeRate" action="<?= Container::$routeCollection->getRoute('community.currencyExchangeRates.new-action')->generateLink(['communitySlug' => $community->getSlug(), 'code' => $currency->getCode()]) ?>" method="post" data-reload-on-success="true" data-observe-inputs="exchange_rate,valid_from"></form>
                         <input type="number" form="newExchangeRate" class="text fullWidth" name="exchange_rate" min="0" step="0.000000001" required>
                     </td>
                     <td>
diff --git a/views/communities/transaction_edit.php b/views/communities/transaction_edit.php
index 1bbbb6e..76c3392 100644
--- a/views/communities/transaction_edit.php
+++ b/views/communities/transaction_edit.php
@@ -2,8 +2,8 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
-        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId()]) ?>">Transactions</a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug()]) ?>">Transactions</a> »
         <?php if (isset($transaction)): ?>
             Edit transaction
         <?php else: ?>
@@ -13,10 +13,10 @@
     <div class="box compactBox">
         <?php
         $formAction = isset($transaction) ?
-            Container::$routeCollection->getRoute('community.transactions.edit-action')->generateLink(['communityId' => $community->getId(), 'transactionId' => $transaction->getId()]) :
-            Container::$routeCollection->getRoute('community.transactions.new-action')->generateLink(['communityId' => $community->getId()]);
+            Container::$routeCollection->getRoute('community.transactions.edit-action')->generateLink(['communitySlug' => $community->getSlug(), 'transactionId' => $transaction->getId()]) :
+            Container::$routeCollection->getRoute('community.transactions.new-action')->generateLink(['communitySlug' => $community->getSlug()]);
         ?>
-        <form id="transactionForm" action="<?= $formAction ?>" method="post" data-redirect-on-success="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId()]) ?>">
+        <form id="transactionForm" action="<?= $formAction ?>" method="post" data-redirect-on-success="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug()]) ?>">
             <p class="formLabel">Payer</p>
             <select class="big fullWidth" name="payer_user_id" required>
                 <option value="" hidden></option>
@@ -53,7 +53,7 @@
             </div>
         </form>
         <?php if (isset($transaction)): ?>
-            <form id="deleteTransaction" action="<?= Container::$routeCollection->getRoute('community.transactions.delete-action')->generateLink(['communityId' => $community->getId(), 'transactionId' => $transaction->getId()]) ?>" method="post" data-redirect-on-success="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId()]) ?>"></form>
+            <form id="deleteTransaction" action="<?= Container::$routeCollection->getRoute('community.transactions.delete-action')->generateLink(['communitySlug' => $community->getSlug(), 'transactionId' => $transaction->getId()]) ?>" method="post" data-redirect-on-success="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug()]) ?>"></form>
         <?php endif; ?>
     </div>
 @endsection
diff --git a/views/communities/transactions.php b/views/communities/transactions.php
index e9b44df..e16e65e 100644
--- a/views/communities/transactions.php
+++ b/views/communities/transactions.php
@@ -2,31 +2,31 @@
 
 @section(main)
     <h2>
-        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a> »
+        <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a> »
         Transactions
     </h2>
 
-    <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.transactions.new')->generateLink(['communityId' => $community->getId()]) ?>">New transaction</a></p>
+    <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.transactions.new')->generateLink(['communitySlug' => $community->getSlug()]) ?>">New transaction</a></p>
 
     <?php if ($numberOfTransactions > 0): ?>
         <?php if ($pages > 1): ?>
             <p class="paginateContainer marginTop">
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => 0]) ?>">«</a>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => max(0, $currentPage - 1)]) ?>">‹</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => 0]) ?>">«</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => max(0, $currentPage - 1)]) ?>">‹</a>
                 <?php for ($i = 0; $i < $pages; $i++): ?>
                     <?php if ($currentPage == $i): ?>
                         <span class="selected"><?= $i + 1 ?></span>
                     <?php else: ?>
-                        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => $i]) ?>"><?= $i + 1 ?></a>
+                        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => $i]) ?>"><?= $i + 1 ?></a>
                     <?php endif; ?>
                 <?php endfor; ?>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => min($pages - 1, $currentPage + 1)]) ?>">›</a>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => $pages - 1]) ?>">»</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => min($pages - 1, $currentPage + 1)]) ?>">›</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => $pages - 1]) ?>">»</a>
             </p>
         <?php endif; ?>
 
         <?php foreach ($transactions as $transaction): ?>
-            <a class="block" href="<?= Container::$routeCollection->getRoute('community.transactions.edit')->generateLink(['communityId' => $community->getId(), 'transactionId' => $transaction->getId()]) ?>">
+            <a class="block" href="<?= Container::$routeCollection->getRoute('community.transactions.edit')->generateLink(['communitySlug' => $community->getSlug(), 'transactionId' => $transaction->getId()]) ?>">
             <div class="box transaction">
                 <div>
                     <p style="font-weight: bold;"><?= $transaction->getDescription() ?></p>
@@ -45,21 +45,21 @@
 
         <?php if ($pages > 1): ?>
             <p class="paginateContainer marginTop">
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => 0]) ?>">«</a>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => max(0, $currentPage - 1)]) ?>">‹</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => 0]) ?>">«</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => max(0, $currentPage - 1)]) ?>">‹</a>
                 <?php for ($i = 0; $i < $pages; $i++): ?>
                     <?php if ($currentPage == $i): ?>
                         <span class="selected"><?= $i + 1 ?></span>
                     <?php else: ?>
-                        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => $i]) ?>"><?= $i + 1 ?></a>
+                        <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => $i]) ?>"><?= $i + 1 ?></a>
                     <?php endif; ?>
                 <?php endfor; ?>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => min($pages - 1, $currentPage + 1)]) ?>">›</a>
-                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId(), 'page' => $pages - 1]) ?>">»</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => min($pages - 1, $currentPage + 1)]) ?>">›</a>
+                <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communitySlug' => $community->getSlug(), 'page' => $pages - 1]) ?>">»</a>
             </p>
         <?php endif; ?>
 
-        <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.transactions.new')->generateLink(['communityId' => $community->getId()]) ?>">New transaction</a></p>
+        <p class="marginTop"><a href="<?= Container::$routeCollection->getRoute('community.transactions.new')->generateLink(['communitySlug' => $community->getSlug()]) ?>">New transaction</a></p>
     <?php else: ?>
         <div class="box">
             <p>There are no transactions yet.</p>
diff --git a/views/home.php b/views/home.php
index e2e81a9..67a997d 100644
--- a/views/home.php
+++ b/views/home.php
@@ -9,7 +9,7 @@
             </h3>
             <?php if (count($communities) > 0): ?>
                 <?php foreach ($communities as $community): ?>
-                    <p><a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communityId' => $community->getId()]) ?>"><?= $community->getName() ?></a></p>
+                    <p><a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>"><?= $community->getName() ?></a></p>
                 <?php endforeach; ?>
             <?php else: ?>
                 <p>You have no community.</p>
diff --git a/web.php b/web.php
index 68e0c31..81aac81 100644
--- a/web.php
+++ b/web.php
@@ -64,7 +64,7 @@ Container::$routeCollection->get('searchUser', 'searchUser', [UserSearchControll
 Container::$routeCollection->group('communities', function (RouteCollection $routeCollection) {
     $routeCollection->get('community.new', 'new', [CommunityController::class, 'getCommunityNew']);
     $routeCollection->post('community.new-action', 'new', [CommunityController::class, 'saveCommunity']);
-    $routeCollection->group('{communityId}', function (RouteCollection $routeCollection) {
+    $routeCollection->group('{communitySlug}', function (RouteCollection $routeCollection) {
         $routeCollection->get('community', '', [CommunityController::class, 'getCommunityHome']);
         $routeCollection->get('community.settings', 'settings', [CommunityController::class, 'getCommunitySettings']);
         $routeCollection->get('community.edit', 'edit', [CommunityController::class, 'getCommunityEdit']);