Base64 Encode/Decode
Base64 Encode/Decode handles one task — encode and decode base64 — without an account or a download. Parsing, formatting and validation all run in your browser, so API keys, tokens and internal payloads are never transmitted. It is used most by frontend developers checking a token or payload shape. Follows the published specification rather than a loose approximation. Free, unlimited, and free of the upsells most tools of this kind carry.
Key features
- Follows the published specification rather than a loose approximation.
- Nothing is logged, which is what makes it safe for production data.
- Works on desktop, tablet and phone — no separate app to install.
- No ads interrupting the tool itself, and no upsell before the result.
How to use Base64 Encode/Decode
- Paste your input: Drop the payload, code or value into the box above.
- Run it: Press the action button — errors are reported with their position.
- Take the output: Copy the result, or download it when the output is a file.
Frequently asked questions
- Does it follow the official spec? — Yes — the published specification, not a simplified version, so results match your language's own parser.
- How large an input can it take? — Several megabytes is routine. The limit is your browser's memory, not a server quota.
- What happens with invalid input? — You get the position of the problem rather than a blank failure, so it is usable as a validator.
- Is it safe to paste production data into Base64 Encode/Decode? — Yes. Base64 Encode/Decode runs entirely in your browser — no request is made, nothing is logged, and nothing persists after you close the tab.