Convert plain text to Base64 or decode Base64 back to readable text with full UTF-8 support. Toggle URL-safe mode for JWT-style encoding without + or /.
Everything runs locally in your browser. Your data is never uploaded — ideal for API debugging, config snippets, and quick encoding tasks.
Base64 turns binary data into ASCII text using 64 safe characters (A–Z, a–z, 0–9, +, /). It is commonly used for embedding data in JSON, email, URLs, and configuration files.
No. Encoding and decoding run entirely in your browser. Text and uploaded files never leave your device.
URL-safe Base64 replaces + with - and / with _ so the string can appear in URLs and JWT segments without extra escaping. Padding (=) is often omitted.
When decoded bytes are not valid UTF-8 text, the tool shows a hex preview instead of garbled characters. Use a binary-aware tool if you need the raw bytes.
Yes. Use Upload in encode mode to Base64-encode a small file. For decode mode, upload a .txt file containing Base64 text.
Files larger than 5 MB are rejected to keep the tab responsive. For huge payloads, use a command-line tool instead.
Yes. It is free, requires no signup, and works offline after the page loads.