Free TOTP Generator Online

What is the TOTP generator?

The TOTP generator is a free, secure online tool that computes Time-based One-Time Passwords (TOTP) for two-factor authentication (2FA). TOTP codes are commonly used to secure logins across platforms like GitHub, Google, AWS, and other services. The code acts as a second layer of security alongside your password.

Our browser-based authenticator tool generates 2FA verification codes fully client-side. It parses your Base32 shared secret key and uses HMAC hashing algorithms to compute the matching 6-digit or 8-digit token locally, so code generation never sends your secret over the internet. Only the optional QR code preview is rendered through a TestMu AI backend service.

How to use the TOTP generator?

Generating dynamic 2FA verification codes takes only a few simple steps. Follow these instructions to get your current code:

• Enter the Secret Key: Paste your Base32 shared secret key (provided by your service provider during 2FA setup) into the secret input panel.
• Configure Your Parameters: Select the HMAC hashing algorithm (typically SHA-1, but SHA-256 and SHA-512 are also supported), the token length (6 or 8 digits), and the step period (typically 30 seconds).
• Add Account Profile: Provide an optional issuer name (e.g. GitHub) and account label to save the credential locally for future sessions.
• Copy the Verification Code: Retrieve your code from the active countdown card. Use the copy button to transfer the code to your login screen.

Features of the TOTP generator

Our authenticator utility offers advanced options for developers and administrators managing multi-account credentials. The features of our generator include:

• Multi-Profile Account Manager: Save multiple accounts to your local storage to generate distinct 2FA tokens concurrently on a single screen.
• Backup Import and Export: Download your configured profiles as a plain JSON backup file and restore them anytime. Store it safely, since it contains your secret keys.
• Custom Step Periods: Adjust step intervals to support custom security configurations (e.g. 15-second or 60-second windows).
• Visual Circular Timer: Displays a dynamic SVG circular countdown that indicates exactly how many seconds remain before the active code expires.
• Client-Side Execution: Cryptographic operations run in javascript, meaning you can load the page and generate tokens offline.

Use cases of the TOTP generator

Time-based OTP generators are essential during development, testing, and operations. The primary use cases include:

• Automated Testing Workflows: Generate 2FA codes programmatically or fetch them visually to log into test environments. Sibling utilities like the Token Generator or HMAC Generator can be used alongside to construct secure payloads.
• Multi-Factor Authentication Setup: Validate secret keys and scan generated QR codes to sync your mobile authenticator apps.
• Shared Team Access: Store shared operations keys securely, allowing multiple engineers to generate tokens without sharing physical devices. Combine with our Password Strength Checker to maintain strong corporate guidelines.
• Backup Access Keys: Keep a visual backup of Base32 keys in an offline-ready environment to recover accounts if a primary device is lost.

This utility is maintained by TestMu AI, creators of a comprehensive automated testing platform. Our focus on secure, client-side tools ensures developers can debug APIs and manage logins with complete confidence.

Frequently Asked Questions (FAQs)

What is a TOTP generator?

A Time-based One-Time Password (TOTP) generator computes temporary 6-digit or 8-digit verification codes using a shared Base32 secret key and the current Unix time. It is commonly used for two-factor authentication (2FA).

Is it secure to use this TOTP generator online?

Yes, all TOTP code calculations run locally in your browser using JavaScript, so code generation never sends your secret key to any server. Note that the optional QR code preview is rendered by a TestMu AI backend service, which receives your otpauth URI including the secret.

What parameters are customizable in this tool?

You can customize the hashing algorithm (SHA-1, SHA-256, SHA-512), the token code length (6 or 8 digits), and the time step interval (typically 30 seconds, but 15 or 60 seconds are also supported).

How do I import or export saved accounts?

You can save accounts locally, then use the backup settings to download a backup file in plain JSON format. This backup can be restored at any time. Keep the file safe, because it contains your secret keys in readable form.

Can I use this tool offline?

Mostly, yes. Once the page is loaded, all hashing and token calculations run locally in JavaScript, so codes keep refreshing without a connection. Only the QR code preview requires the network, since it is generated through a backend service.

What is the difference between TOTP and HOTP?

TOTP relies on the current timestamp as the moving factor, generating new codes automatically. HOTP uses an incrementing counter that advances each time a user requests a code, requiring manual sync.

Why does the verification code change every 30 seconds?

The 30-second window is the standard step period. It balances accessibility for typing with high security, ensuring that leaked codes expire rapidly and cannot be reused.