diff --git a/src/main/java/de/financer/controller/AccountController.java b/src/main/java/de/financer/controller/AccountController.java
index 9cff5f9..12e318f 100644
--- a/src/main/java/de/financer/controller/AccountController.java
+++ b/src/main/java/de/financer/controller/AccountController.java
@@ -10,6 +10,9 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+
 @RestController
 @RequestMapping("accounts")
 public class AccountController {
@@ -21,7 +24,13 @@ public class AccountController {
 
     @RequestMapping("getByKey")
     public Account getAccountByKey(String key) {
-        return this.accountService.getAccountByKey(key);
+        final String decoded = URLDecoder.decode(key, StandardCharsets.UTF_8);
+
+        if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug(String.format("/accounts/getAccountByKey got parameter: %s", decoded));
+        }
+
+        return this.accountService.getAccountByKey(decoded);
     }
 
     @RequestMapping("getAll")
@@ -31,11 +40,13 @@ public class AccountController {
 
     @RequestMapping("createAccount")
     public ResponseEntity createAccount(String key, String type) {
+        final String decoded = URLDecoder.decode(key, StandardCharsets.UTF_8);
+
         if (LOGGER.isDebugEnabled()) {
-            LOGGER.debug(String.format("/accounts/createAccount got parameters: %s, %s", key, type));
+            LOGGER.debug(String.format("/accounts/createAccount got parameters: %s, %s", decoded, type));
         }
 
-        final ResponseReason responseReason = this.accountService.createAccount(key, type);
+        final ResponseReason responseReason = this.accountService.createAccount(decoded, type);
 
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String.format("/accounts/createAccount returns with %s", responseReason.name()));
@@ -46,11 +57,13 @@ public class AccountController {
 
     @RequestMapping("closeAccount")
     public ResponseEntity closeAccount(String key) {
+        final String decoded = URLDecoder.decode(key, StandardCharsets.UTF_8);
+
         if (LOGGER.isDebugEnabled()) {
-            LOGGER.debug(String.format("/accounts/closeAccount got parameters: %s", key));
+            LOGGER.debug(String.format("/accounts/closeAccount got parameters: %s", decoded));
         }
 
-        final ResponseReason responseReason = this.accountService.closeAccount(key);
+        final ResponseReason responseReason = this.accountService.closeAccount(decoded);
 
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String.format("/accounts/closeAccount returns with %s", responseReason.name()));
@@ -61,11 +74,13 @@ public class AccountController {
 
     @RequestMapping("openAccount")
     public ResponseEntity openAccount(String key) {
+        final String decoded = URLDecoder.decode(key, StandardCharsets.UTF_8);
+
         if (LOGGER.isDebugEnabled()) {
-            LOGGER.debug(String.format("/accounts/openAccount got parameters: %s", key));
+            LOGGER.debug(String.format("/accounts/openAccount got parameters: %s", decoded));
         }
 
-        final ResponseReason responseReason = this.accountService.openAccount(key);
+        final ResponseReason responseReason = this.accountService.openAccount(decoded);
 
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String.format("/accounts/openAccount returns with %s", responseReason.name()));
diff --git a/src/main/java/de/financer/controller/RecurringTransactionController.java b/src/main/java/de/financer/controller/RecurringTransactionController.java
index 2d495d8..dc8ba26 100644
--- a/src/main/java/de/financer/controller/RecurringTransactionController.java
+++ b/src/main/java/de/financer/controller/RecurringTransactionController.java
@@ -10,6 +10,8 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.util.Optional;
 
 @RestController
@@ -33,7 +35,13 @@ public class RecurringTransactionController {
 
     @RequestMapping("getAllForAccount")
     public Iterable<RecurringTransaction> getAllForAccount(String accountKey) {
-        return this.recurringTransactionService.getAllForAccount(accountKey);
+        final String decoded = URLDecoder.decode(accountKey, StandardCharsets.UTF_8);
+
+        if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug(String.format("/recurringTransactions/getAllForAccount got parameter: %s", decoded));
+        }
+
+        return this.recurringTransactionService.getAllForAccount(decoded);
     }
 
     @RequestMapping("getAllDueToday")
@@ -47,15 +55,18 @@ public class RecurringTransactionController {
                                                      String intervalType, String firstOccurrence,
                                                      String lastOccurrence
     ) {
+        final String decodedFrom = URLDecoder.decode(fromAccountKey, StandardCharsets.UTF_8);
+        final String decodedTo = URLDecoder.decode(toAccountKey, StandardCharsets.UTF_8);
+
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String
                     .format("/recurringTransactions/createRecurringTransaction got parameters: %s, %s, %s, %s, %s, " +
-                                    "%s, %s, %s", fromAccountKey, toAccountKey, amount, description, holidayWeekendType,
+                                    "%s, %s, %s", decodedFrom, decodedTo, amount, description, holidayWeekendType,
                             intervalType, firstOccurrence, lastOccurrence));
         }
 
         final ResponseReason responseReason = this.recurringTransactionService
-                .createRecurringTransaction(fromAccountKey, toAccountKey, amount, description, holidayWeekendType,
+                .createRecurringTransaction(decodedFrom, decodedTo, amount, description, holidayWeekendType,
                         intervalType, firstOccurrence, lastOccurrence);
 
         if (LOGGER.isDebugEnabled()) {
diff --git a/src/main/java/de/financer/controller/TransactionController.java b/src/main/java/de/financer/controller/TransactionController.java
index 276a3f4..bce51d3 100644
--- a/src/main/java/de/financer/controller/TransactionController.java
+++ b/src/main/java/de/financer/controller/TransactionController.java
@@ -10,6 +10,9 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+
 @RestController
 @RequestMapping("transactions")
 public class TransactionController {
@@ -25,21 +28,30 @@ public class TransactionController {
 
     @RequestMapping("getAllForAccount")
     public Iterable<Transaction> getAllForAccount(String accountKey) {
-        return this.transactionService.getAllForAccount(accountKey);
+        final String decoded = URLDecoder.decode(accountKey, StandardCharsets.UTF_8);
+
+        if (LOGGER.isDebugEnabled()) {
+            LOGGER.debug(String.format("/transactions/getAllForAccount got parameter: %s", decoded));
+        }
+
+        return this.transactionService.getAllForAccount(decoded);
     }
 
     @RequestMapping(value = "createTransaction")
     public ResponseEntity createTransaction(String fromAccountKey, String toAccountKey, Long amount, String date,
                                             String description
     ) {
+        final String decodedFrom = URLDecoder.decode(fromAccountKey, StandardCharsets.UTF_8);
+        final String decodedTo = URLDecoder.decode(toAccountKey, StandardCharsets.UTF_8);
+
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String
                     .format("/transactions/createTransaction got parameters: %s, %s, %s, %s, %s",
-                            fromAccountKey, toAccountKey, amount, date, description));
+                            decodedFrom, decodedTo, amount, date, description));
         }
 
         final ResponseReason responseReason = this.transactionService
-                .createTransaction(fromAccountKey, toAccountKey, amount, date, description);
+                .createTransaction(decodedFrom, decodedTo, amount, date, description);
 
         if (LOGGER.isDebugEnabled()) {
             LOGGER.debug(String.format("/transactions/createTransaction returns with %s", responseReason.name()));