diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71dc2b032..cf41c076e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 
 ### Improved
 - Bangumi search now shows the score and summary of a search result ([@MajorTanya](https://github.com/MajorTanya)) ([#1396](https://github.com/mihonapp/mihon/pull/1396))
+- Extension repo URLs are now auto-formatted ([@AntsyLich](https://github.com/AntsyLich), [@MajorTanya](https://github.com/MajorTanya))
 
 ## [v0.17.0] - 2024-10-26
 ### Added
diff --git a/domain/src/main/java/mihon/domain/extensionrepo/interactor/CreateExtensionRepo.kt b/domain/src/main/java/mihon/domain/extensionrepo/interactor/CreateExtensionRepo.kt
index c44006970..02623d8af 100644
--- a/domain/src/main/java/mihon/domain/extensionrepo/interactor/CreateExtensionRepo.kt
+++ b/domain/src/main/java/mihon/domain/extensionrepo/interactor/CreateExtensionRepo.kt
@@ -5,6 +5,7 @@ import mihon.domain.extensionrepo.exception.SaveExtensionRepoException
 import mihon.domain.extensionrepo.model.ExtensionRepo
 import mihon.domain.extensionrepo.repository.ExtensionRepoRepository
 import mihon.domain.extensionrepo.service.ExtensionRepoService
+import okhttp3.HttpUrl.Companion.toHttpUrlOrNull
 import tachiyomi.core.common.util.system.logcat
 
 class CreateExtensionRepo(
@@ -13,12 +14,13 @@ class CreateExtensionRepo(
 ) {
     private val repoRegex = """^https://.*/index\.min\.json$""".toRegex()
 
-    suspend fun await(repoUrl: String): Result {
-        if (!repoUrl.matches(repoRegex)) {
-            return Result.InvalidUrl
-        }
+    suspend fun await(indexUrl: String): Result {
+        val formattedIndexUrl = indexUrl.toHttpUrlOrNull()
+            ?.toString()
+            ?.takeIf { it.matches(repoRegex) }
+            ?: return Result.InvalidUrl
 
-        val baseUrl = repoUrl.removeSuffix("/index.min.json")
+        val baseUrl = formattedIndexUrl.removeSuffix("/index.min.json")
         return service.fetchRepoDetails(baseUrl)?.let { insert(it) } ?: Result.InvalidUrl
     }
 
diff --git a/domain/src/main/java/mihon/domain/extensionrepo/service/ExtensionRepoService.kt b/domain/src/main/java/mihon/domain/extensionrepo/service/ExtensionRepoService.kt
index 27e00f3a2..2d86b89d1 100644
--- a/domain/src/main/java/mihon/domain/extensionrepo/service/ExtensionRepoService.kt
+++ b/domain/src/main/java/mihon/domain/extensionrepo/service/ExtensionRepoService.kt
@@ -1,6 +1,5 @@
 package mihon.domain.extensionrepo.service
 
-import androidx.core.net.toUri
 import eu.kanade.tachiyomi.network.GET
 import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.awaitSuccess
@@ -21,11 +20,9 @@ class ExtensionRepoService(
         repo: String,
     ): ExtensionRepo? {
         return withIOContext {
-            val url = "$repo/repo.json".toUri()
-
             try {
                 with(json) {
-                    client.newCall(GET(url.toString()))
+                    client.newCall(GET("$repo/repo.json"))
                         .awaitSuccess()
                         .parseAs<ExtensionRepoMetaDto>()
                         .toExtensionRepo(baseUrl = repo)