diff --git a/src/main/kotlin/dev/usbharu/hideout/config/Config.kt b/src/main/kotlin/dev/usbharu/hideout/config/Config.kt
index 1623ff25..45023914 100644
--- a/src/main/kotlin/dev/usbharu/hideout/config/Config.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/config/Config.kt
@@ -15,50 +15,3 @@ data class ConfigData(
     val objectMapper: ObjectMapper = jacksonObjectMapper(),
     val characterLimit: CharacterLimit = CharacterLimit()
 )
-
-@Deprecated("Config is deprecated")
-data class CharacterLimit(
-    val general: General = General.of(),
-    val post: Post = Post(),
-    val account: Account = Account(),
-    val instance: Instance = Instance()
-) {
-    @Deprecated("Config is deprecated")
-    data class General private constructor(
-        val url: Int,
-        val domain: Int,
-        val publicKey: Int,
-        val privateKey: Int
-    ) {
-        companion object {
-            @Suppress("FunctionMinLength")
-            fun of(url: Int? = null, domain: Int? = null, publicKey: Int? = null, privateKey: Int? = null): General {
-                return General(
-                    url ?: 1000,
-                    domain ?: 1000,
-                    publicKey ?: 10000,
-                    privateKey ?: 10000
-                )
-            }
-        }
-    }
-
-    @Deprecated("Config is deprecated")
-    data class Post(
-        val text: Int = 3000,
-        val overview: Int = 3000
-    )
-
-    @Deprecated("Config is deprecated")
-    data class Account(
-        val id: Int = 300,
-        val name: Int = 300,
-        val description: Int = 10000
-    )
-
-    @Deprecated("Config is deprecated")
-    data class Instance(
-        val name: Int = 600,
-        val description: Int = 10000
-    )
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/config/SpringConfig.kt b/src/main/kotlin/dev/usbharu/hideout/config/SpringConfig.kt
index 18ee3845..237b2c6c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/config/SpringConfig.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/config/SpringConfig.kt
@@ -28,6 +28,7 @@ class SpringConfig {
     }
 }
 
+
 @ConfigurationProperties("hideout")
 data class ApplicationConfig(
     val url: URL
@@ -43,3 +44,35 @@ data class StorageConfig(
     val accessKey: String,
     val secretKey: String
 )
+
+@ConfigurationProperties("hideout.character-limit")
+data class CharacterLimit(
+    val general: General = General(),
+    val post: Post = Post(),
+    val account: Account = Account(),
+    val instance: Instance = Instance()
+) {
+
+    data class General(
+        val url: Int = 1000,
+        val domain: Int = 1000,
+        val publicKey: Int = 10000,
+        val privateKey: Int = 10000
+    )
+
+    data class Post(
+        val text: Int = 3000,
+        val overview: Int = 3000
+    )
+
+    data class Account(
+        val id: Int = 300,
+        val name: Int = 300,
+        val description: Int = 10000
+    )
+
+    data class Instance(
+        val name: Int = 600,
+        val description: Int = 10000
+    )
+}
diff --git a/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Post.kt b/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Post.kt
index afe45261..d500c2cd 100644
--- a/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Post.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/domain/model/hideout/entity/Post.kt
@@ -1,6 +1,8 @@
 package dev.usbharu.hideout.domain.model.hideout.entity
 
+import dev.usbharu.hideout.config.CharacterLimit
 import dev.usbharu.hideout.config.Config
+import org.springframework.stereotype.Component
 
 data class Post private constructor(
     val id: Long,
@@ -18,6 +20,7 @@ data class Post private constructor(
 ) {
     companion object {
         @Suppress("FunctionMinLength", "LongParameterList")
+        @Deprecated("Static builder is deprecated")
         fun of(
             id: Long,
             userId: Long,
@@ -74,4 +77,62 @@ data class Post private constructor(
             )
         }
     }
+
+    @Component
+    class PostBuilder(private val characterLimit: CharacterLimit) {
+        @Suppress("FunctionMinLength", "LongParameterList")
+        fun of(
+            id: Long,
+            userId: Long,
+            overview: String? = null,
+            text: String,
+            createdAt: Long,
+            visibility: Visibility,
+            url: String,
+            repostId: Long? = null,
+            replyId: Long? = null,
+            sensitive: Boolean = false,
+            apId: String = url,
+            mediaIds: List<Long> = emptyList()
+        ): Post {
+            require(id >= 0) { "id must be greater than or equal to 0." }
+
+            require(userId >= 0) { "userId must be greater than or equal to 0." }
+
+            val limitedOverview = if ((overview?.length ?: 0) >= characterLimit.post.overview) {
+                overview?.substring(0, characterLimit.post.overview)
+            } else {
+                overview
+            }
+
+            val limitedText = if (text.length >= characterLimit.post.text) {
+                text.substring(0, characterLimit.post.text)
+            } else {
+                text
+            }
+
+            require(url.isNotBlank()) { "url must contain non-blank characters" }
+            require(url.length <= characterLimit.general.url) {
+                "url must not exceed ${characterLimit.general.url} characters."
+            }
+
+            require((repostId ?: 0) >= 0) { "repostId must be greater then or equal to 0." }
+            require((replyId ?: 0) >= 0) { "replyId must be greater then or equal to 0." }
+
+            return Post(
+                id = id,
+                userId = userId,
+                overview = limitedOverview,
+                text = limitedText,
+                createdAt = createdAt,
+                visibility = visibility,
+                url = url,
+                repostId = repostId,
+                replyId = replyId,
+                sensitive = sensitive,
+                apId = apId,
+                mediaIds = mediaIds
+            )
+        }
+    }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt b/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
index 8a7b1a95..26a6306b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/ap/APNoteService.kt
@@ -69,6 +69,7 @@ class APNoteServiceImpl(
     private val postService: PostService,
     private val apResourceResolveService: APResourceResolveService,
     private val apRequestService: APRequestService,
+    private val postBuilder: Post.PostBuilder,
     private val transaction: Transaction
 
 ) : APNoteService, PostCreateInterceptor {
@@ -224,7 +225,7 @@ class APNoteServiceImpl(
 
         // TODO: リモートのメディア処理を追加
         postService.createRemote(
-            Post.of(
+            postBuilder.of(
                 id = postRepository.generateId(),
                 userId = person.second.id,
                 text = note.content.orEmpty(),
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/post/PostServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/service/post/PostServiceImpl.kt
index ac5e54c6..c98ee233 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/post/PostServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/post/PostServiceImpl.kt
@@ -16,7 +16,8 @@ class PostServiceImpl(
     private val postRepository: PostRepository,
     private val userRepository: UserRepository,
     private val timelineService: TimelineService,
-    private val postQueryService: PostQueryService
+    private val postQueryService: PostQueryService,
+    private val postBuilder: Post.PostBuilder
 ) : PostService {
     private val interceptors = Collections.synchronizedList(mutableListOf<PostCreateInterceptor>())
 
@@ -45,7 +46,7 @@ class PostServiceImpl(
     private suspend fun internalCreate(post: PostCreateDto, isLocal: Boolean): Post {
         val user = userRepository.findById(post.userId) ?: throw UserNotFoundException("${post.userId} was not found")
         val id = postRepository.generateId()
-        val createPost = Post.of(
+        val createPost = postBuilder.of(
             id = id,
             userId = post.userId,
             overview = post.overview,