diff --git a/src/config.ts b/src/config.ts
index 68175a46..68bf3ed8 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -350,6 +350,17 @@ class Conf {
       };
     },
   };
+  static profileFields = {
+    get maxFields(): number {
+      return Number(Deno.env.get('PROFILE_FIELDS_MAX_FIELDS') || 10);
+    },
+    get nameLength(): number {
+      return Number(Deno.env.get('PROFILE_FIELDS_NAME_LENGTH') || 255);
+    },
+    get valueLength(): number {
+      return Number(Deno.env.get('PROFILE_FIELDS_VALUE_LENGTH') || 2047);
+    },
+  };
 }
 
 const optionalBooleanSchema = z
diff --git a/src/controllers/api/instance.ts b/src/controllers/api/instance.ts
index fe8f76ae..92e517c3 100644
--- a/src/controllers/api/instance.ts
+++ b/src/controllers/api/instance.ts
@@ -50,7 +50,9 @@ const instanceV1Controller: AppController = async (c) => {
       metadata: {
         features,
         fields_limits: {
-          max_fields: 10,
+          max_fields: Conf.profileFields.maxFields,
+          name_length: Conf.profileFields.nameLength,
+          value_length: Conf.profileFields.valueLength,
         },
       },
     },
@@ -145,7 +147,9 @@ const instanceV2Controller: AppController = async (c) => {
       metadata: {
         features,
         fields_limits: {
-          max_fields: 10,
+          max_fields: Conf.profileFields.maxFields,
+          name_length: Conf.profileFields.nameLength,
+          value_length: Conf.profileFields.valueLength,
         },
       },
     },
diff --git a/src/views/mastodon/accounts.ts b/src/views/mastodon/accounts.ts
index 4845304e..9b13efbf 100644
--- a/src/views/mastodon/accounts.ts
+++ b/src/views/mastodon/accounts.ts
@@ -60,7 +60,14 @@ async function renderAccount(
     }
   }
   const { html } = parseNoteContent(about || '', []);
-  const fields = _fields?.slice(0, 10).map(([name, value]) => ({ name, value, verified_at: null })) ?? [];
+
+  const fields = _fields
+    ?.slice(0, Conf.profileFields.maxFields)
+    .map(([name, value]) => ({
+      name: name.slice(0, Conf.profileFields.nameLength),
+      value: value.slice(0, Conf.profileFields.valueLength),
+      verified_at: null,
+    })) ?? [];
 
   return {
     id: pubkey,