Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to plain text instantly. No server, works entirely in your browser.
Base64 encoding is one of the most fundamental and ubiquitous techniques in modern software development. It converts binary data — images, files, cryptographic signatures, or any sequence of bytes — into a safe, ASCII-printable string that can travel through text-only systems without corruption. You encounter Base64 every day without realising it: email attachments, CSS data URIs, JSON Web Tokens (JWTs), OAuth credentials, and HTTP Basic Authentication headers all rely on it. Our encoder and decoder works entirely in your browser, processes input character by character in real time, and shows you both character counts and size overhead — because Base64 encoding always increases data size by approximately 33%.
Base64 is most commonly encountered alongside JSON data. If you are decoding a JWT or inspecting an API response where values appear as long, seemingly random strings ending with ==, those are almost certainly Base64-encoded payloads. Our JSON Formatter & Validator is the ideal companion: decode your Base64 string first, then paste the resulting JSON into the formatter to instantly validate its structure and inspect its contents with syntax highlighting.
Another common source of Base64 strings in developer workflows is Unix timestamps embedded in tokens and logs. When decoded, these timestamps appear as large integers. Our Unix Timestamp Converter translates those epoch values into precise, human-readable dates and times — completing the full decode workflow from raw Base64 string to meaningful, readable output in just two steps.