diff --git a/packages/backend/src/misc/password.ts b/packages/backend/src/misc/password.ts
new file mode 100644
index 000000000..4e5a3d1be
--- /dev/null
+++ b/packages/backend/src/misc/password.ts
@@ -0,0 +1,10 @@
+import bcrypt from 'bcryptjs';
+
+export async function hashPassword(password: string): Promise<string> {
+	const salt = await bcrypt.genSalt(8);
+	return await bcrypt.hash(password, salt);
+}
+
+export async function comparePassword(password: string, hash: string): Promise<boolean> {
+	return await bcrypt.compare(password, hash);
+}
diff --git a/packages/backend/src/server/api/common/signup.ts b/packages/backend/src/server/api/common/signup.ts
index 150d27218..7ae1c09b0 100644
--- a/packages/backend/src/server/api/common/signup.ts
+++ b/packages/backend/src/server/api/common/signup.ts
@@ -1,11 +1,11 @@
 import { generateKeyPair } from 'node:crypto';
-import bcrypt from 'bcryptjs';
 import { IsNull } from 'typeorm';
 import { User } from '@/models/entities/user.js';
 import { Users, UsedUsernames } from '@/models/index.js';
 import { UserProfile } from '@/models/entities/user-profile.js';
 import { genId } from '@/misc/gen-id.js';
 import { toPunyNullable } from '@/misc/convert-host.js';
+import { hashPassword } from '@/misc/password.js';
 import { UserKeypair } from '@/models/entities/user-keypair.js';
 import { usersChart } from '@/services/chart/index.js';
 import { UsedUsername } from '@/models/entities/used-username.js';
@@ -33,9 +33,7 @@ export async function signup(opts: {
 			throw new ApiError('INVALID_PASSWORD');
 		}
 
-		// Generate hash of password
-		const salt = await bcrypt.genSalt(8);
-		hash = await bcrypt.hash(password, salt);
+		hash = await hashPassword(password);
 	}
 
 	// Generate secret
diff --git a/packages/backend/src/server/api/endpoints/admin/reset-password.ts b/packages/backend/src/server/api/endpoints/admin/reset-password.ts
index 4a54a96e3..5561b1507 100644
--- a/packages/backend/src/server/api/endpoints/admin/reset-password.ts
+++ b/packages/backend/src/server/api/endpoints/admin/reset-password.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { hashPassword } from '@/misc/password.js';
 import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { Users, UserProfiles } from '@/models/index.js';
 import { ApiError } from '@/server/api/error.js';
@@ -17,8 +17,6 @@ export const meta = {
 			password: {
 				type: 'string',
 				optional: false, nullable: false,
-				minLength: 8,
-				maxLength: 8,
 			},
 		},
 	},
@@ -46,18 +44,15 @@ export default define(meta, paramDef, async (ps) => {
 		throw new ApiError('IS_ADMIN');
 	}
 
-	const passwd = secureRndstr(8, true);
-
-	// Generate hash of password
-	const hash = bcrypt.hashSync(passwd);
+	const password = secureRndstr(8, true);
 
 	await UserProfiles.update({
 		userId: user.id,
 	}, {
-		password: hash,
+		password: await hashPassword(password),
 	});
 
 	return {
-		password: passwd,
+		password,
 	};
 });
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts b/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
index 809efe814..73773c8c5 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/key-done.ts
@@ -1,7 +1,7 @@
 import { promisify } from 'node:util';
-import bcrypt from 'bcryptjs';
 import * as cbor from 'cbor';
 import { MINUTE } from '@/const.js';
+import { comparePassword } from '@/misc/password.js';
 import {
 	UserProfiles,
 	UserSecurityKeys,
@@ -41,10 +41,7 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts b/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
index 65dd4804f..32e85463c 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/register-key.ts
@@ -1,8 +1,8 @@
 import { promisify } from 'node:util';
 import * as crypto from 'node:crypto';
-import bcrypt from 'bcryptjs';
 import { UserProfiles, AttestationChallenges } from '@/models/index.js';
 import { genId } from '@/misc/gen-id.js';
+import { comparePassword } from '@/misc/password.js';
 import { ApiError } from '@/server/api/error.js';
 import define from '../../../define.js';
 import { hash } from '../../../2fa.js';
@@ -29,10 +29,7 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/register.ts b/packages/backend/src/server/api/endpoints/i/2fa/register.ts
index db80a850f..59a7f5d8b 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/register.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/register.ts
@@ -1,7 +1,7 @@
-import bcrypt from 'bcryptjs';
 import * as speakeasy from 'speakeasy';
 import * as QRCode from 'qrcode';
 import config from '@/config/index.js';
+import { comparePassword } from '@/misc/password.js';
 import { UserProfiles } from '@/models/index.js';
 import { ApiError } from '@/server/api/error.js';
 import define from '../../../define.js';
@@ -26,10 +26,7 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts b/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
index 4e704ab63..4164e114c 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/remove-key.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { comparePassword } from '@/misc/password.js';
 import { UserProfiles, UserSecurityKeys, Users } from '@/models/index.js';
 import { publishMainStream } from '@/services/stream.js';
 import { ApiError } from '@/server/api/error.js';
@@ -25,10 +25,7 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts b/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
index d9730bde9..c82fde0b3 100644
--- a/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
+++ b/packages/backend/src/server/api/endpoints/i/2fa/unregister.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { comparePassword } from '@/misc/password.js';
 import { UserProfiles } from '@/models/index.js';
 import { ApiError } from '@/server/api/error.js';
 import define from '../../../define.js';
@@ -23,10 +23,7 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/change-password.ts b/packages/backend/src/server/api/endpoints/i/change-password.ts
index 3df7b0237..e7fd70391 100644
--- a/packages/backend/src/server/api/endpoints/i/change-password.ts
+++ b/packages/backend/src/server/api/endpoints/i/change-password.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { comparePassword, hashPassword } from '@/misc/password.js';
 import { UserProfiles } from '@/models/index.js';
 import { ApiError } from '@/server/api/error.js';
 import define from '../../define.js';
@@ -24,18 +24,11 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.currentPassword, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.currentPassword, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
-	// Generate hash of password
-	const salt = await bcrypt.genSalt(8);
-	const hash = await bcrypt.hash(ps.newPassword, salt);
-
 	await UserProfiles.update(user.id, {
-		password: hash,
+		password: await hashPassword(ps.newPassword),
 	});
 });
diff --git a/packages/backend/src/server/api/endpoints/i/delete-account.ts b/packages/backend/src/server/api/endpoints/i/delete-account.ts
index 01268373d..8db1455e5 100644
--- a/packages/backend/src/server/api/endpoints/i/delete-account.ts
+++ b/packages/backend/src/server/api/endpoints/i/delete-account.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { comparePassword } from '@/misc/password.js';
 import { UserProfiles, Users } from '@/models/index.js';
 import { deleteAccount } from '@/services/delete-account.js';
 import { ApiError } from '@/server/api/error.js';
@@ -28,10 +28,7 @@ export default define(meta, paramDef, async (ps, user) => {
 		return;
 	}
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/regenerate-token.ts b/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
index 50bd73f4a..2bec1ed17 100644
--- a/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
+++ b/packages/backend/src/server/api/endpoints/i/regenerate-token.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { comparePassword } from '@/misc/password.js';
 import { publishInternalEvent, publishMainStream, publishUserEvent } from '@/services/stream.js';
 import { Users, UserProfiles } from '@/models/index.js';
 import generateUserToken from '../../common/generate-native-user-token.js';
@@ -28,10 +28,7 @@ export default define(meta, paramDef, async (ps, user) => {
 
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) {
+	if (!(await comparePassword(ps.password, profile.password!))) {
 		throw new ApiError('ACCESS_DENIED');
 	}
 
diff --git a/packages/backend/src/server/api/endpoints/i/update-email.ts b/packages/backend/src/server/api/endpoints/i/update-email.ts
index 057ad5cf3..2a2413730 100644
--- a/packages/backend/src/server/api/endpoints/i/update-email.ts
+++ b/packages/backend/src/server/api/endpoints/i/update-email.ts
@@ -1,6 +1,6 @@
-import bcrypt from 'bcryptjs';
 import { publishMainStream } from '@/services/stream.js';
 import config from '@/config/index.js';
+import { comparePassword } from '@/misc/password.js';
 import { secureRndstr } from '@/misc/secure-rndstr.js';
 import { Users, UserProfiles } from '@/models/index.js';
 import { sendEmail } from '@/services/send-email.js';
@@ -37,10 +37,9 @@ export const paramDef = {
 export default define(meta, paramDef, async (ps, user) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
-	// Compare password
-	const same = await bcrypt.compare(ps.password, profile.password!);
-
-	if (!same) throw new ApiError('ACCESS_DENIED');
+	if (!(await comparePassword(ps.password, profile.password!))) {
+		throw new ApiError('ACCESS_DENIED');
+	}
 
 	if (ps.email != null) {
 		const available = await validateEmailForAccount(ps.email);
diff --git a/packages/backend/src/server/api/endpoints/reset-password.ts b/packages/backend/src/server/api/endpoints/reset-password.ts
index 51b26a2b0..c46fcb6fd 100644
--- a/packages/backend/src/server/api/endpoints/reset-password.ts
+++ b/packages/backend/src/server/api/endpoints/reset-password.ts
@@ -1,4 +1,4 @@
-import bcrypt from 'bcryptjs';
+import { hashPassword } from '@/misc/password.js';
 import { UserProfiles, PasswordResetRequests } from '@/models/index.js';
 import { DAY, MINUTE } from '@/const.js';
 import define from '../define.js';
@@ -43,12 +43,8 @@ export default define(meta, paramDef, async (ps, user) => {
 		throw new ApiError('NO_SUCH_RESET_REQUEST');
 	}
 
-	// Generate hash of password
-	const salt = await bcrypt.genSalt(8);
-	const hash = await bcrypt.hash(ps.password, salt);
-
 	await UserProfiles.update(req.userId, {
-		password: hash,
+		password: await hashPassword(ps.password),
 	});
 
 	await PasswordResetRequests.delete(req.id);
diff --git a/packages/backend/src/server/api/private/signin.ts b/packages/backend/src/server/api/private/signin.ts
index f5cc7af08..6ca957056 100644
--- a/packages/backend/src/server/api/private/signin.ts
+++ b/packages/backend/src/server/api/private/signin.ts
@@ -1,7 +1,6 @@
 import { randomBytes } from 'node:crypto';
 import { IsNull } from 'typeorm';
 import Koa from 'koa';
-import bcrypt from 'bcryptjs';
 import * as speakeasy from 'speakeasy';
 import { SECOND, MINUTE, HOUR } from '@/const.js';
 import config from '@/config/index.js';
@@ -9,6 +8,7 @@ import { Users, Signins, UserProfiles, UserSecurityKeys, AttestationChallenges }
 import { ILocalUser } from '@/models/entities/user.js';
 import { genId } from '@/misc/gen-id.js';
 import { getIpHash } from '@/misc/get-ip-hash.js';
+import { comparePassword } from '@/misc/password.js';
 import signin from '../common/signin.js';
 import { verifyLogin, hash } from '../2fa.js';
 import { limiter } from '../limiter.js';
@@ -67,7 +67,7 @@ export default async (ctx: Koa.Context) => {
 	const profile = await UserProfiles.findOneByOrFail({ userId: user.id });
 
 	// Compare password
-	const same = await bcrypt.compare(password, profile.password!);
+	const same = await comparePassword(password, profile.password!);
 
 	async function fail(): void {
 		// Append signin history
diff --git a/packages/backend/src/server/api/private/signup.ts b/packages/backend/src/server/api/private/signup.ts
index e20fb9abb..fafa96362 100644
--- a/packages/backend/src/server/api/private/signup.ts
+++ b/packages/backend/src/server/api/private/signup.ts
@@ -1,7 +1,7 @@
 import Koa from 'koa';
-import bcrypt from 'bcryptjs';
 import { fetchMeta } from '@/misc/fetch-meta.js';
 import { verifyHcaptcha, verifyRecaptcha } from '@/misc/captcha.js';
+import { hashPassword } from '@/misc/password.js';
 import { Users, RegistrationTickets, UserPendings } from '@/models/index.js';
 import config from '@/config/index.js';
 import { sendEmail } from '@/services/send-email.js';
@@ -71,17 +71,13 @@ export default async (ctx: Koa.Context) => {
 	if (instance.emailRequiredForSignup) {
 		const code = secureRndstr(16);
 
-		// Generate hash of password
-		const salt = await bcrypt.genSalt(8);
-		const hash = await bcrypt.hash(password, salt);
-
 		await UserPendings.insert({
 			id: genId(),
 			createdAt: new Date(),
 			code,
 			email: emailAddress,
 			username,
-			password: hash,
+			password: await hashPassword(password),
 		});
 
 		const link = `${config.url}/signup-complete/${code}`;
diff --git a/packages/backend/src/services/create-system-user.ts b/packages/backend/src/services/create-system-user.ts
index 2285f1586..f965e82d7 100644
--- a/packages/backend/src/services/create-system-user.ts
+++ b/packages/backend/src/services/create-system-user.ts
@@ -1,7 +1,7 @@
-import bcrypt from 'bcryptjs';
 import { v4 as uuid } from 'uuid';
 import { IsNull } from 'typeorm';
 import { genRsaKeyPair } from '@/misc/gen-key-pair.js';
+import { hashPassword } from '@/misc/password.js';
 import { User } from '@/models/entities/user.js';
 import { UserProfile } from '@/models/entities/user-profile.js';
 import { genId } from '@/misc/gen-id.js';
@@ -11,11 +11,7 @@ import { db } from '@/db/postgre.js';
 import generateNativeUserToken from '@/server/api/common/generate-native-user-token.js';
 
 export async function createSystemUser(username: string): Promise<User> {
-	const password = uuid();
-
-	// Generate hash of password
-	const salt = await bcrypt.genSalt(8);
-	const hash = await bcrypt.hash(password, salt);
+	const password = await hashPassword(uuid());
 
 	// Generate secret
 	const secret = generateNativeUserToken();
@@ -55,7 +51,7 @@ export async function createSystemUser(username: string): Promise<User> {
 		await transactionalEntityManager.insert(UserProfile, {
 			userId: account.id,
 			autoAcceptFollowed: false,
-			password: hash,
+			password,
 		});
 
 		await transactionalEntityManager.insert(UsedUsername, {