Generate cryptographically random recovery codes for two-factor authentication — locally, with no server involved.
Print these codes and store them somewhere safe — they're the only way back into your account if you lose your 2FA device.
Was this tool helpful?
90% · 70 people found this tool helpful
If you lose your phone or hardware token, 2FA backup codes are the only way back into your accounts. This generator produces cryptographically strong recovery codes using your browser's Web Crypto API — never a math-class random number — and lets you tune the count, length and grouping to match what each service expects. Codes are generated locally and can be copied or downloaded as a text file you can print and store offline.
Adjust the settings that shape your 2fa backup code — length, style, character sets, or any format flags shown above the preview.
Click the generate button to produce a fresh, unique 2fa backup code using your browser's cryptographic random source.
If the first result doesn't fit, regenerate as many times as you like — each output is independent.
Copy the value to your clipboard or export it as a file for use in your project, config, or account.
2FA Backup Code Generator solves the problem of producing high-entropy, correctly-formatted values on demand without opening a terminal or hunting for a snippet on Stack Overflow. Whether you need a value for a config file, a test fixture, a demo, or a production credential, having a trustworthy generator one click away removes friction from a dozen tiny workflows a week. Toolzer's design philosophy is simple: privacy-first (no tracking, no accounts), performance-first (the page is interactive in under a second on a 3G connection), and honesty-first (no fake ratings, no dark patterns, no upsells). 2FA Backup Code Generator follows the same rules as every other utility on the site. You can bookmark this page, share the URL with a colleague, or pin it to your browser's toolbar — the experience will be identical every visit, and it will keep working even if you're on airplane Wi-Fi. Real people use this tool for real work — freelancers cleaning up client deliverables, sysadmins triaging tickets, students finishing assignments — and it is tuned for those workflows, not for demo videos.
Print them and keep the paper in a safe place — a locked drawer, a fireproof safe, or with your other ID documents. Treat them like spare house keys.
We use window.crypto.getRandomValues, which the browser fills from the operating system's cryptographic RNG. It's the same source TLS uses.
No. These are one-time recovery codes. The 2FA secret itself is issued by each service when you enable 2FA and must come from them, not from us.
We exclude 0/O/1/I to make printed codes unambiguous when you type them back in under stress.
No. Every utility on Toolzer is free, anonymous, and works in any modern browser without registration.
Yes. Whenever the tool can produce an answer entirely in the browser, the data never leaves your device.
Yes. The interface is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser.
Yes. Every Toolzer page has a clean permanent URL you can bookmark or share.
Weak passwords are still the number-one cause of account compromise.
A strong password isn't just one with a symbol bolted onto the end — it's one with enough entropy that no o…
Even a long, complex password is useless once it appears in a public data breach — credential-stuffing bots…
HTTP security headers are the cheapest, highest-leverage defence a website has: a single response header ca…
Malicious links are the number-one way malware, phishing kits and credential stealers reach victims.