diff --git a/.config/example.yml b/.config/example.yml
index 3b35778fae..ba53bde43a 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -93,20 +93,17 @@ redis:
 #   ┌───────────────┐
 #───┘ ID generation └───────────────────────────────────────────
 
-# You can select the ID generation method.
-# You don't usually need to change this setting, but you can
-# change it according to your preferences.
+# No need to uncomment in most cases, but you may want to change
+# these settings if you plan to run a large and/or distributed server.
 
-# Available methods:
-# aid ... Short, Millisecond accuracy
-# meid ... Similar to ObjectID, Millisecond accuracy
-# ulid ... Millisecond accuracy
-# objectid ... This is left for backward compatibility
+# cuid:
+#   # Min 16, Max 24
+#   length: 16
+#
+#   # Set this to a unique string across workers (e.g., machine's hostname)
+#   # if your workers are running in multiple hosts.
+#   fingerprint: my-fingerprint
 
-# ONCE YOU HAVE STARTED THE INSTANCE, DO NOT CHANGE THE
-# ID SETTINGS AFTER THAT!
-
-id: 'aid'
 
 #   ┌─────────────────────┐
 #───┘ Other configuration └─────────────────────────────────────
diff --git a/packages/backend/native-utils/__test__/index.spec.mjs b/packages/backend/native-utils/__test__/index.spec.mjs
index 0d41e012dd..7d68d6ac36 100644
--- a/packages/backend/native-utils/__test__/index.spec.mjs
+++ b/packages/backend/native-utils/__test__/index.spec.mjs
@@ -1,7 +1,9 @@
 import test from "ava";
 
-import { sum } from "../index.js";
+import { convertId, IdConvertType } from "../built/index.js";
 
-test("sum from native", (t) => {
-	t.is(sum(1, 2), 3);
+test("convert to mastodon id", (t) => {
+	t.is(convertId("9gf61ehcxv", IdConvertType.MastodonId), "960365976481219");
+	t.is(convertId("9fbr9z0wbrjqyd3u", IdConvertType.MastodonId), "3954607381600562394");
+	t.is(convertId("9fbs680oyviiqrol9md73p8g", IdConvertType.MastodonId), "3494513243013053824")
 });
diff --git a/packages/backend/package.json b/packages/backend/package.json
index 10153116f3..bffa42c495 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -32,6 +32,7 @@
 		"@koa/cors": "3.4.3",
 		"@koa/multer": "3.0.0",
 		"@koa/router": "9.0.1",
+		"@paralleldrive/cuid2": "2.2.0",
 		"@peertube/http-signature": "1.7.0",
 		"@redocly/openapi-core": "1.0.0-beta.120",
 		"@sinonjs/fake-timers": "9.1.2",
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index da0f5571ec..54332c9932 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -60,7 +60,10 @@ export type Source = {
 
 	onlyQueueProcessor?: boolean;
 
-	id: string;
+	cuid?: {
+		length?: number;
+		fingerprint?: string;
+	};
 
 	outgoingAddressFamily?: "ipv4" | "ipv6" | "dual";
 
diff --git a/packages/backend/src/misc/gen-id.ts b/packages/backend/src/misc/gen-id.ts
index b7cc0965a1..fb92dd808c 100644
--- a/packages/backend/src/misc/gen-id.ts
+++ b/packages/backend/src/misc/gen-id.ts
@@ -1,27 +1,27 @@
-import { ulid } from "ulid";
-import { genAid } from "./id/aid.js";
-import { genMeid } from "./id/meid.js";
-import { genMeidg } from "./id/meidg.js";
-import { genObjectId } from "./id/object-id.js";
+import { init, createId } from "@paralleldrive/cuid2";
 import config from "@/config/index.js";
 
-const metohd = config.id.toLowerCase();
+const TIME2000 = 946684800000;
+const TIMESTAMP_LENGTH = 8;
 
+const length =
+	Math.min(Math.max(config.cuid?.length ?? 16, 16), 24) - TIMESTAMP_LENGTH;
+const fingerprint = `${config.cuid?.fingerprint ?? ""}${createId()}`;
+
+const genCuid2 = init({ length, fingerprint });
+
+/**
+ * The generated ID results in the form of `[8 chars timestamp] + [cuid2]`.
+ * The minimum and maximum lengths are 16 and 24, respectively.
+ * With the length of 16, namely 8 for cuid2, roughly 1427399 IDs are needed
+ * in the same millisecond to reach 50% chance of collision.
+ *
+ * Ref: https://github.com/paralleldrive/cuid2#parameterized-length
+ */
 export function genId(date?: Date): string {
-	if (!date || date > new Date()) date = new Date();
+	const now = (date ?? new Date()).getTime();
+	const time = Math.max(now - TIME2000, 0);
+	const timestamp = time.toString(36).padStart(TIMESTAMP_LENGTH, "0");
 
-	switch (metohd) {
-		case "aid":
-			return genAid(date);
-		case "meid":
-			return genMeid(date);
-		case "meidg":
-			return genMeidg(date);
-		case "ulid":
-			return ulid(date.getTime());
-		case "objectid":
-			return genObjectId(date);
-		default:
-			throw new Error("unrecognized id generation method");
-	}
+	return `${timestamp}${genCuid2()}`;
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index abf12b62e3..4c9b786737 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -108,6 +108,9 @@ importers:
       '@koa/router':
         specifier: 9.0.1
         version: 9.0.1
+      '@paralleldrive/cuid2':
+        specifier: 2.2.0
+        version: 2.2.0
       '@peertube/http-signature':
         specifier: 1.7.0
         version: 1.7.0
@@ -2310,6 +2313,10 @@ packages:
     hasBin: true
     dev: false
 
+  /@noble/hashes@1.3.0:
+    resolution: {integrity: sha512-ilHEACi9DwqJB0pw7kv+Apvh50jiiSyR/cQ3y4W7lOR5mhvn/50FLUfsnfJz0BDZtl/RR16kXvptiv6q1msYZg==}
+    dev: false
+
   /@nodelib/fs.scandir@2.1.5:
     resolution: {integrity: sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==}
     engines: {node: '>= 8'}
@@ -2363,6 +2370,12 @@ packages:
       through: 2.3.4
     dev: false
 
+  /@paralleldrive/cuid2@2.2.0:
+    resolution: {integrity: sha512-CVQDpPIUHrUGGLdrMGz1NmqZvqmsB2j2rCIQEu1EvxWjlFh4fhvEGmgR409cY20/67/WlJsggenq0no3p3kYsw==}
+    dependencies:
+      '@noble/hashes': 1.3.0
+    dev: false
+
   /@peertube/http-signature@1.7.0:
     resolution: {integrity: sha512-aGQIwo6/sWtyyqhVK4e1MtxYz4N1X8CNt6SOtCc+Wnczs5S5ONaLHDDR8LYaGn0MgOwvGgXyuZ5sJIfd7iyoUw==}
     engines: {node: '>=0.10'}