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2FA Code Generator

Generate one or up to 50 TOTP codes in your browser.

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Description

Generate one or up to 50 TOTP codes in your browser. No uploads, account, or secret storage. Paste a Base32 key or otpauth URI and copy instantly.

About 2FA Code Generator

What is 2FA Code Generator?

2FA Code Generator is a browser-only utility that calculates RFC 6238 TOTP two-factor authentication codes from Base32 secrets or otpauth URIs without server uploads.

What 2FA Code Generator does

2FA Code Generator calculates time-based one-time password (TOTP) codes locally within the browser tab following the RFC 6238 standard. It accepts single or batch inputs up to 50 lines using Base32 secret keys or otpauth://totp URIs, supporting custom labels, algorithms like SHA-256 and SHA-512, and custom periods. The tool features countdown timers, refreshes codes automatically, and decodes QR screenshots in the browser without calling an API or saving authentication data to browser storage.

Who 2FA Code Generator is for

Users and developers who need to generate temporary two-factor authentication codes or test TOTP keys in a web browser without installing an app or storing credentials.

Key features

  • Calculates standards-based TOTP codes in the browser tab using Base32 keys or otpauth URIs under RFC 6238.
  • Supports batch processing of up to 50 labeled entries simultaneously with individual status reporting.
  • Automatically refreshes active codes and displays countdown timers for remaining validity periods.
  • Operates without sending secrets to a server API or persisting keys in browser storage.
  • Allows uploading QR screenshots that decode only in this browser to read setup secrets.
  • Reads supported settings from otpauth URIs including SHA-256, SHA-512, seven or eight digits, and alternative periods.

Facts from 2facode.im, checked 8 November 2026

  • Generates codes entirely on-device using bundled browser cryptography including Web Crypto and otplib.
  • Operates under the RFC 6238 TOTP standard with default 30-second time steps.
  • Processes up to 50 secret entries in a single batch without persistent storage.
  • Free to use without an account or advertising scripts.

Written from 2FA Code Generator's own website (Homepage, About). The maker can claim this listing to edit it.

Categories

Security & Privacy

Frequently asked questions

Is 2FA Code Generator free to use?

Yes, it is free to use online with no account required and no paid generation limits.

Are secret keys or generated codes sent to a server?

No, all code calculations run inside the browser tab and no secret keys or codes are transmitted to servers or saved in storage.

How many secret keys can be processed at once?

The batch generator accepts up to 50 lines in a single batch with support for custom labels.

Which TOTP standards and algorithms are supported?

It follows RFC 6238, supporting the default 30-second HMAC-SHA-1 format as well as SHA-256, SHA-512, and custom periods via otpauth URIs.

Can 2FA Code Generator recover a lost secret or bypass 2FA?

No, it cannot recover missing secrets or bypass two-factor authentication; the original shared secret key is required.

Does the tool store secrets after closing the tab?

No, entries exist only in temporary page memory and disappear when you clear the workspace, reload, or close the browser tab.

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