One Time Pad

One Time Pad — runs 100% in your browser. No data is uploaded; nothing leaves your device.

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Encrypt (generates a fresh random pad)

Message

Decrypt

Ciphertext (base64)Pad / key (base64)

A true one-time pad is unbreakable if the key is truly random, as long as the message, used once, and kept secret. Keys here come from crypto.getRandomValues. Everything runs in your browser.

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Reach for One Time Pad whenever you need to get a fast, private result. It is used by developers, security professionals and curious users who need a fast, private result with no sign-up.

How to embed One Time Pad on your website

Add this free tool to your own site, blog or intranet — it's 100% free to embed. Paste this snippet where you want the tool to appear; it loads a clean, self-contained version with no ads or navigation.

<iframe src="https://tooljolt.com/embed/one-time-pad" title="One Time Pad" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px" loading="lazy"></iframe>

About One Time Pad

One Time Pad is a free online security tool that lets you one Time Pad. It runs entirely in your browser — no sign-up, no uploads and nothing ever sent to a server — so it is fast, private and safe to use with sensitive data. Whether you are a developer, security professional, student or just curious, One Time Pad gives you an instant, reliable result with zero setup.

How to use One Time Pad

1Open One Time Pad — it loads instantly with nothing to install.
2Enter your input or choose your options.
3Get an instant result.
4Copy or download it — everything stays in your browser.

Why use One Time Pad?

✓100% free with no sign-up, accounts, watermarks or usage limits
✓Runs entirely in your browser — your input never leaves your device, ideal for confidential security data
✓Simple, fast and reliable
✓Privacy-friendly by design
✓Works on any device with a modern web browser, online or offline

Frequently asked questions

Is One Time Pad free to use?+

Yes. One Time Pad is 100% free with no sign-up, no account, no usage limits and no watermarks. Use it as often as you like.

Does One Time Pad upload my data to a server?+

No. One Time Pad runs entirely in your browser using JavaScript — nothing you type or upload ever leaves your device. That makes it safe to use with sensitive or confidential security data.