Online 2FA Code Generator

Free browser-based TOTP authenticator — no app install needed

Works offline | 100% client-side

Quick Tips

  • Paste a key to instantly generate a code
  • Click the code to copy it instantly
  • Codes auto-refresh every 30 seconds
  • Tokens saved in your browser only
  • Keep your device clock in sync for accuracy

Shortcuts

  • Add new token
    Ctrl N
  • Confirm / Save Enter
  • Cancel / Close Esc
  • Copy 1st code
    Ctrl 1

Bookmark This Page

Press Ctrl+D to bookmark and access your codes anytime.

What Is Two-Factor Authentication (2FA)?

Understanding the security layer that protects your online accounts

Two-factor authentication (2FA), also known as two-step verification or multi-factor authentication (MFA), is a security process that requires users to provide two different authentication factors to verify their identity before gaining access to an account or system.

The two factors typically involve:

Something You Know

Your password, PIN, or security question answer. This is the first layer of protection, but passwords alone can be stolen through phishing, data breaches, or brute-force attacks.

Something You Have

A time-based one-time password (TOTP) from an authenticator app, a hardware security key, or an SMS code. This second factor ensures that even if your password is compromised, your account remains secure.

With 2FA enabled, even if an attacker obtains your password, they still cannot access your account without the second factor — the verification code that changes every 30 seconds. This makes two-factor authentication one of the most effective and widely recommended security measures for protecting email, banking, social media, and cryptocurrency accounts.

What Is TOTP? How Time-Based One-Time Passwords Work

The algorithm behind authenticator apps and this 2FA code generator

TOTP (Time-Based One-Time Password) is an algorithm defined in RFC 6238 that generates temporary verification codes using two inputs: a shared secret key and the current time.

1

Secret Key

A Base32-encoded shared secret (e.g., JBSWY3DPEHPK3PXP) is generated when you enable 2FA on a service.

2

Time Counter

The current Unix timestamp is divided into 30-second intervals, creating a time counter that both the server and client agree on.

3

HMAC-SHA1

The secret and time counter are fed into the HMAC-SHA1 hash function, producing a unique 6-digit code that is valid for exactly 30 seconds.

Why Time Sync Matters

Because TOTP relies on the current time, both your device and the server must agree on what time it is. If your device clock is off by more than 30 seconds, the generated codes may not match. Always ensure your device is set to automatic time synchronization (NTP) for accurate code generation.

How to Use This Online 2FA Code Generator

Generate verification codes from your secret key in three simple steps

1

Paste Your Secret Key

Paste your Base32-encoded secret key into the input field at the top. This is the key you received when you first set up 2FA on a service — it's usually shown alongside a QR code. Your 6-digit TOTP code is generated instantly as soon as you paste.

2

Copy and Authenticate

Click anywhere on the code to copy it to your clipboard. The circular timer shows how many seconds remain before the code refreshes. Green means plenty of time, yellow means it's running low, and red means a new code is about to generate. Paste the code into the verification field on the service you're logging into.

3

Save for Quick Access (Optional)

Click "Save This Token" to add a label and store the token in your browser for future visits. Saved tokens appear below and generate codes automatically every time you open the page. You can save multiple tokens for all your accounts — Gmail, GitHub, Binance, and more.

Is This Online 2FA Generator Safe?

Your security and privacy are our top priority

100% Client-Side Processing

All TOTP code generation happens entirely in your browser using the Web Crypto API. Your secret keys are never sent to any server. You can verify this by disconnecting from the internet — the tool continues to work.

Local Storage Only

Your tokens and secret keys are stored exclusively in your browser's localStorage. They never leave your device, are not synced to any cloud, and are not accessible to us or any third party.

Standards Compliant

This tool implements the TOTP algorithm exactly as specified in RFC 6238 using HMAC-SHA1, 30-second time steps, and 6-digit codes — the same standard used by Google Authenticator, Authy, and Microsoft Authenticator.

Works Offline

Once the page is loaded, you can disconnect from the internet and the 2FA code generator will continue to work perfectly. This proves that no data is being transmitted to any external server.

TOTP vs HOTP: What's the Difference?

Understanding the two main one-time password algorithms

Feature TOTP (Time-Based) HOTP (Counter-Based)
Based On Current time (30-second intervals) Incrementing counter value
Code Validity Expires after 30 seconds Valid until used
Security Higher (codes expire automatically) Lower (codes don't expire)
Sync Requirement Accurate device clock Counter sync between client/server
Used By Google, GitHub, Facebook, Discord Some banking systems, YubiKey
RFC RFC 6238 RFC 4226

This tool uses TOTP — the same time-based algorithm used by Google Authenticator, Authy, Microsoft Authenticator, 1Password, and virtually all modern 2FA implementations. TOTP is considered more secure because codes expire automatically, reducing the window for interception attacks.

Why Use a Browser-Based 2FA Authenticator?

Generate 2FA codes without installing an app

Desktop Access Without Phone

Access your 2FA codes directly from your computer when your phone is unavailable, out of battery, or lost. No need to switch between devices.

No App Installation Required

No need to install Google Authenticator, Authy, or any mobile app. Works in any modern browser on desktop, laptop, tablet, or phone.

Emergency Backup

Use this tool as an emergency backup for your 2FA codes. If you saved your secret keys, you can regenerate codes from any device with a browser.

Instant & Free

No account creation, no sign-up, no cost. Just paste your secret key and get your verification code instantly. Bookmark the page for quick access.

Compatible With All Major Services

Works with any service that uses TOTP-based two-factor authentication

Google / Gmail
GitHub
Facebook
Discord
Instagram
Twitter / X
Amazon / AWS
Microsoft
Binance
Coinbase
Dropbox
LinkedIn
Reddit
Twitch
WordPress
1000+ More

This tool works with any service that uses TOTP-based two-factor authentication (RFC 6238), including all services compatible with Google Authenticator.

Why Authenticator Apps Are More Secure Than SMS

SMS-based 2FA has known vulnerabilities that authenticator-based codes avoid

SMS Verification

  • Vulnerable to SIM swapping attacks
  • Can be intercepted via SS7 protocol exploits
  • Requires cellular signal to receive codes
  • Delayed delivery in some regions

TOTP Authenticator

  • Not affected by SIM swapping
  • Codes generated locally, can't be intercepted
  • Works completely offline
  • Instant code generation, no delays

Frequently Asked Questions

Everything you need to know about using our free online 2FA code generator

A 2FA secret key is a Base32-encoded string (like JBSWY3DPEHPK3PXP) that a service generates when you enable two-factor authentication. You'll find it during the 2FA setup process, usually displayed as a text string below or alongside a QR code. It's often labeled "Secret Key", "Setup Key", "Manual Entry Key", or "Can't scan the QR code?". Always save this key securely as a backup — you'll need it to recover your 2FA if you lose access to your authenticator device.
Yes. This tool generates the exact same TOTP codes as Google Authenticator, Authy, Microsoft Authenticator, 1Password, and any other authenticator app that follows the RFC 6238 standard. If a service works with Google Authenticator, it works with this tool. The underlying algorithm (HMAC-SHA1 with 30-second time steps and 6-digit codes) is identical.
Your secret keys are completely safe. All code generation happens 100% client-side in your browser using JavaScript and the Web Crypto API. Your keys are stored only in your browser's localStorage on your device. They are never transmitted to our servers or any third party. You can verify this by opening your browser's Developer Tools (Network tab) — no requests are made when generating codes. The tool even works offline.
The most common cause is a time synchronization issue. TOTP codes depend on your device's clock being accurate to within 30 seconds of the server's time. Go to your device's Date & Time settings and enable "Set time automatically" or "Sync with internet time". Other causes include: using the wrong secret key, having extra spaces in the key, or the service using a non-standard time step or hash algorithm.
Yes, that's exactly what this tool is for. You don't need a phone, Google Authenticator, or any mobile app. Just open this page in any modern web browser on your desktop, laptop, or tablet, paste your 2FA secret key, and get your verification code. It's perfect for users who prefer not to use a mobile app or need 2FA access from their computer.
Since tokens are stored in your browser's localStorage, clearing your browser data, cookies, or site data will remove your saved tokens. We recommend keeping a secure backup of your 2FA secret keys in a password manager or encrypted storage. If you clear your browser data, you'll need to re-add your tokens using the secret keys.
Yes. You can add as many tokens as you need. Each token has its own label and secret key, so you can easily manage 2FA for multiple services (Gmail, GitHub, Discord, Binance, etc.) all in one place. All tokens generate codes simultaneously and auto-refresh every 30 seconds.
The easiest way is to save your 2FA secret keys somewhere secure (like a password manager). Then, on your new device or browser, simply visit this page and add your tokens using those secret keys. Since the secret key is all that's needed to generate codes, the same key will produce the same codes on any device at the same time.
Yes. Cryptocurrency exchanges like Binance, Coinbase, Kraken, and KuCoin all use standard TOTP-based 2FA. Simply copy the secret key provided during 2FA setup on the exchange, add it as a token here, and use the generated codes to authenticate. This tool is fully compatible with all TOTP-based 2FA implementations.