TOTP / 2FA Code Generator Online — Free & Private
Generate live 6-digit authenticator codes from a 2FA secret key. Free, private, and processed entirely in your browser — no upload, no account, no file ever leaves your device.
How to use TOTP / 2FA Code Generator
Generate live 6-digit authenticator codes from a 2FA secret key. Everything runs in this tab — nothing is uploaded for the core job.
- Enter your content — Type or paste what you want to work with — TOTP / 2FA Code Generator runs immediately in your browser.
- Choose your options — Set any options TOTP / 2FA Code Generator offers.
- Get your result — Copy or download the result \u{2014} done entirely on your device, nothing uploaded.
Privacy proof for TOTP / 2FA Code Generator
This tool processes files in your browser. Open DevTools → Network while you run it: your document is not uploaded. After one online visit, many tools keep working with Airplane Mode on (libraries cached locally).
Popular tools
The highest-demand tools with full options — browse by category below for the rest.
Star any tool — it appears under Favorites on this device.
How this actually works
Each tool runs entirely with JavaScript already loaded in this page — PDF tools via pdf-lib and pdf.js, image tools via the browser's native Canvas API, and everything else with plain JavaScript. Your files or input are read into browser memory, processed, and handed back as a download or copyable result. This page itself is served by a small Laravel route; Laravel never sees your files either. The only backend in use is Supabase, and only for two optional things: signing in with a magic link, and — only if you're signed in — a log of which tool you ran and when. Honest limits worth knowing: Compress PDF flattens each page to a re-encoded image (great for scans, not ideal if you need selectable text after); HEIC conversion uses a small on-demand converter when the browser cannot decode HEIC natively (Safari often works without it); Fill PDF Form is best-effort for simple AcroForm fields, not a full Adobe Forms replacement; and Word/Excel/PowerPoint ⇄ PDF genuinely needs a server-side engine, so it isn't included — this build only ships tools that can honestly run client-side.
Questions people actually ask
What algorithm does this use?
Standard TOTP (RFC 6238) — the same time-based one-time-password algorithm used by Google Authenticator, Authy, and virtually every 2FA app, computed with HMAC-SHA1 by default.
What format does the secret need to be in?
Base32 (letters A-Z and digits 2-7) — the format nearly every 2FA setup screen provides as a manual entry code alongside its QR code.
Does the code refresh automatically?
Yes — a live 6-digit code updates every 30 seconds by default, with a visual countdown ring showing how much time is left.
Why doesn't my code match my authenticator app?
The most common cause is a device clock that's out of sync — TOTP is time-based, so both sides need to agree closely on the current time. Check your device's clock is accurate.
Can I change the digit count or time step?
Yes — 6 or 8 digits and a custom time step are both adjustable, though 6 digits / 30 seconds (the default) matches virtually every real-world 2FA implementation.
Should I use this as my primary authenticator app?
It's meant for testing or verifying a 2FA secret, not as a daily-driver authenticator — a dedicated app is built to store secrets persistently and securely offline, which this browser tool doesn't attempt to do.
Can I use this to set up 2FA on an account?
No — this generates codes from a secret you already have. To enable 2FA on an account, use that service's own setup flow, which issues you a new secret/QR code to scan into a real authenticator app.
Is my secret sent anywhere?
No — the HMAC computation runs entirely in your browser using the Web Crypto API; the secret never leaves your device.
Is this really free, and is there a file size limit?
Yes — no account, no paywall. Since processing happens in your browser's memory rather than uploading anywhere, the practical limit is your device's available RAM, not a server quota. Very large files (500+ pages) may run slower, especially for Compress and PDF→JPG.
Does anything about my file get sent anywhere?
No. Every tool runs with pdf-lib/pdf.js loaded in this page; your file is read into browser memory and never leaves it. The only network call this app makes for your account is Supabase auth — and that only stores which tool you ran and when, never file content.
Why isn't Word/Excel/PowerPoint → PDF included?
Converting Office formats accurately needs a real rendering engine (what Word or LibreOffice use internally) — no browser library does this reliably. Rather than ship a broken version, it's left out.
Does TechDriven Tools have OCR (text recognition)?
Yes — OCR PDF recognizes text in scanned or photographed pages using Tesseract.js, running entirely on your device, and gives you a searchable PDF or a plain text file. Nothing is uploaded for this either.
Can I use this without an internet connection?
Once the page and its libraries have loaded once, yes — the tools themselves need no network access. Signing in and viewing history do require a connection, since those talk to Supabase.
What happens to the "history" if I sign in?
Only a row per tool run — the tool's name and a timestamp. No filename, no file content, ever. You can see the full list any time via the History button.
Are the non-PDF utilities (password generator, JSON formatter, etc.) private too?
Yes — same rule as the PDF tools. Word Counter, Case Converter, Password Generator, UUID Generator, Base64, Hash Generator, JSON Formatter and JWT Decoder all run with plain JavaScript already loaded in this page; nothing you type or paste is sent anywhere.
TOTP / 2FA Code Generator, in depth
Generate live 6-digit authenticator codes from a 2FA secret key — the same algorithm every real authenticator app uses.
Features
Live Refreshing Code
Updates every 30 seconds with a countdown, same as a real authenticator.
Adjustable Digits & Period
6 or 8 digits, custom time steps if needed.
Multiple Algorithms
SHA-1 (the default virtually everyone uses), SHA-256, or SHA-512.
Private
Your secret never leaves your browser.
Why use TOTP / 2FA Code Generator
- Test or verify your own 2FA setup during development.
- Understand how TOTP codes are actually generated by seeing the real algorithm run.
- Generate a code when you have the secret but not your usual authenticator app handy.
- Debug a 2FA integration against known, real codes.
How it works
This implements RFC 6238 (TOTP) directly: your Base32 secret is decoded, combined with the current 30-second time window, and run through HMAC (via the Web Crypto API) to produce a 6-digit code — the exact algorithm Google Authenticator, Authy, and every standards-compliant authenticator app uses internally.
Not a replacement for a real authenticator app
This is meant for testing and verification, not as a daily-driver authenticator — a dedicated app is built to store secrets persistently and securely offline, which this browser tool doesn't attempt to do. If your code doesn't match your phone's app, the most common cause is a device clock that's out of sync, since TOTP is time-based and both sides need to agree closely on the current time.
Why people search for TOTP / 2FA Code Generator
Generate live 6-digit authenticator codes from a 2FA secret key. Searchers looking for “TOTP / 2FA Code Generator free” or “TOTP / 2FA Code Generator no upload” usually want speed plus privacy — that is exactly the TechDriven Tools model.
TOTP / 2FA Code Generator sits in our Security Tools group. The page is built so you can finish the job without creating an account, installing a desktop pack, or sending the payload to an unknown converter API.
Who TOTP / 2FA Code Generator is for
- You need a result now and do not want another account wall.
- The file or text is sensitive enough that uploading feels wrong.
- A desktop suite is overkill for a one-page or one-photo job.
- You want a second opinion after another converter produced a weird output.
Recommended workflow
Generate or check locally → store results in a password manager — not in chat screenshots.
- Open TOTP / 2FA Code Generator (also available from category hubs and ⌘K).
- Use the labeled fields or dropzone — options match what TOTP / 2FA Code Generator actually does.
- Run the tool and wait for local progress to finish.
- Download or copy the result, then verify on the device where you will share it.
Tips that improve results
- Change one setting at a time when you are comparing quality or layout.
- Keep the original until stakeholders accept the download.
- Rename the output with date + purpose before you attach it to email.
- On phones, plug in power for large PDFs, videos, or spreadsheets.
- Prefer UTF-8 text for developer converters; weird encodings cause most “broken” results.
- Start with a non-sensitive sample so you learn the options before the real file.
Common mistakes with TOTP / 2FA Code Generator
- Expecting TOTP / 2FA Code Generator to replace a full desktop suite for every edge-case format.
- Skipping a sample check and discovering a bad export after the original was deleted.
- Chaining many lossy image/PDF steps when one careful pass would have been enough.
- Using a public computer without clearing downloads afterward.
Privacy model
Processing for TOTP / 2FA Code Generator is designed to stay in the browser. Laravel serves the page; it does not receive your file bytes for conversion. Optional Supabase auth only stores which tool you ran and when — never filenames or contents.
Related tools
- Password Strength Checker
- Text Encryptor/Decryptor
- File Checksum Verifier
- JWT Verifier
- File Encryptor
- Password Breach Checker
FAQ — TOTP / 2FA Code Generator
Is TOTP / 2FA Code Generator free to use?
Yes. TOTP / 2FA Code Generator on TechDriven Tools is free — no account, no watermark, and no paywall for the core workflow.
Does TOTP / 2FA Code Generator upload my file or text?
No for processing. TOTP / 2FA Code Generator runs in your browser tab. Optional sign-in never stores file contents — only tool names and timestamps if you enable history.
When should I use TOTP / 2FA Code Generator?
Use TOTP / 2FA Code Generator for Security Tools jobs where privacy and speed matter: quick one-offs, sensitive inputs, or checking another app’s result without another upload site.
Will TOTP / 2FA Code Generator work on my phone?
Yes in a modern mobile browser. Large inputs can take longer because your device does the work locally.
What are the limits of TOTP / 2FA Code Generator?
There is no server quota from us. Limits are your device memory, battery, and formats the browser can decode. TOTP / 2FA Code Generator will not pretend to support server-only Office or cloud-AI pipelines.
How is TOTP / 2FA Code Generator different from upload-based sites?
Upload converters send your content to someone else’s server. TOTP / 2FA Code Generator keeps the transform on-device whenever the format allows, which is the safer default for confidential documents, photos, tokens, and configs.
Bottom line
If you need TOTP / 2FA Code Generator done quickly and privately, start at /totp-generator, run it once on a sample, then process the real input. That is how TechDriven Tools stays competitive: honest capabilities, labeled UI, and content that matches what the tool actually ships.
From our blog: How to Generate TOTP / 2FA Codes From a Secret