ChronoCode: TOTP Generator

Lexeri

Mit der Lexeri-Chrome-Extension wird der Terminologie-Check so einfach wie eine Rechtschreibprüfung. Mit ihr prüfen Sie Texte direkt in Chrome gegen eine in Lexeri gepflegte Termdatenbank und hilft Ihnen dabei sich an Ihre Corporate Language zu halten.

TOTP Authenticator - 2FA OTP Code Generator

Secure and fast TOTP authenticator for 2FA login. Generate OTP codes offline and manage multiple accounts easily. TOTP Generator — Secure 2FA OTP Authenticator A lightweight, offline‑first browser extension for generating Time‑based One‑Time Passwords (TOTP). Built for websites and apps that support Two‑Factor Authentication (2FA), it delivers a simple, fast, and reliable way to protect your accounts—right inside your browser. - Generate TOTP codes that follow RFC 6238, with a live 30‑second countdown - Add accounts via QR image upload, image paste, otpauth:// URI paste, or image drag‑and‑drop - One‑click Auto‑Fill into web pages; auto‑copy as a fallback when fill isn’t supported - Manage multiple accounts with duplicate detection, quick delete, and clean UI - Optional cross‑device sync via your browser (Chrome) account; automatic local fallback - Import/Export JSON for backup and migration; duplicates are skipped on import Privacy & Security - Works offline with no third‑party network requests; all processing happens locally - Secrets are stored in browser storage; when Chrome Sync is enabled, they can sync across devices - For stronger privacy, enable Chrome’s Sync encryption passphrase (end‑to‑end encryption) - Exports contain plaintext secrets—store backups securely Why Choose TOTP Generator - A reliable 2FA authenticator that runs directly in your browser—no phone required - Lightweight, fast, and easy for both beginners and power users - Polished interface (shadcn/ui + Radix) with multilingual support (English/Chinese) - Ideal for personal and team security workflows Use Cases - Protect logins for Google, GitHub, Microsoft, AWS, Dropbox, and more - Add an extra layer of security with 2FA, or complement existing MFA setups - Replace or augment mobile authenticator apps for browser‑centric workflows Sync & Backup Notes - Cross‑device sync uses chrome.storage.sync; sign in to the same Chrome account and install the same store version of the extension (same ID) to sync - If Sync is off or unavailable, data remains local to the device - Chrome Sync has quotas (~8 KB per key, ~10 MB total); first sync may take time - Unpacked developer builds use a different extension ID and won’t share data with the store version With TOTP Generator, you can strengthen account security, streamline logins, and enjoy a convenient authenticator experience—secure, fast, and privacy‑friendly inside your browser.

mini authenticator

minimal open source authenticator that never store your secret keys - no special permission need: we don't read / write your web pages - simple, single-purpose: just paste your key and we generate the time-base onetime password(TOTP) for two factor aurthentication(2FA) - secure: we do **NOT** store your keys in any places (cookies, chrome storage, cloud ... etc) - offline: no sensitive data transmitted over the internet - open source: everyone can check the source code integrity 1. click on the extension button 2. paste your secret key 3. get your 2FA passcode 🎉 I've used authenticators that are packed with features. They allow you to save your secret keys, sync them across different devices through the internet, also import/export the keys by QRCode. If you are looking for tools like that, I recommend https://authenticator.cc , it's handy, open source and well documented 👍 However, password managers such as Bitwarden, Apple Keychain ... etc already did a very good job in storing and syncing keys across devices. I want to rely on them in secret key management, and let the authenticator extension do only one thing - generate TOTP for 2FA, nothing more. This is where Mini Authenticator comes in. It designed with a "less is more" philosophy in mind. I cut all functionalities that already handled by password managers, and only perform the pure mathematical calculation of TOTP. So it doesn't require storage, read/write your web pages, internet access, special permissions... etc. And most importantly, it's open source, so everyone can inspect and help improving it in future. I agree that this extension is not for everyone, but only those already using password mangers to manage their secret keys, also those who concern about chrome extension permissions and abilities. Visit the project repository: for technicial details. You may also open issues in the project repo, or ping me on Twitter https://twitter.com/hoishing

Neptun TOTP

TOTP Code generation and autofill for Neptun. Developed by S.Tamerlan, Design by B.Feyruz Web extension that generates TOTP codes based on provided ID/Key. Automatically fills the code field of Neptun. Extension by Tamerlan Samat and Feyruz Baghirov.