Best Free Base64 Encode / Decode
Encode/decode Base64 in your browser, with URL-safe and file-to-Base64 options.
100% free
No signup
No watermark
Files processed in memory, never stored
✨
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How it works
- Pick a direction. Choose Encode (text → Base64) or Decode (Base64 → text).
- Paste your input. Type or paste the text; or use Advanced options to load a file.
- Copy the result. Hit Convert and copy the output. Everything runs in your browser.
About this tool
Convert text to Base64 and back without anything leaving your machine. Paste a string, pick encode or decode, and the result appears instantly — Unicode and emoji are handled correctly, not mangled. Developers reach for Base64 to embed data in URLs, JSON, data-URIs and config files; the Advanced options add a URL-safe variant (using - and _ instead of + and /) and let you turn a small file into a Base64 string for inlining.
What people use it for
- Embed an image or font as a data-URI
- Decode a Base64 token or payload to read it
- Make URL-safe Base64 for query strings and JWTs
- Quickly inline a small file as a string
Frequently asked questions
Yes. Text is UTF-8 encoded before Base64, so accented characters and emoji round-trip cleanly instead of breaking.
A variant that swaps + and / for - and _ and drops the = padding, so the result is safe to drop into URLs and tokens like JWTs. Toggle it in Advanced options.
No. Encoding and decoding happen entirely in your browser, so nothing you paste is uploaded anywhere.
The input wasn’t valid Base64 — check for stray spaces, line breaks or missing padding. URL-safe input is accepted too.
Yes, small files. Open Advanced options and choose a file; its Base64 appears in the output, handy for data-URIs. Very large files are better left as binary.
Completely free, no account, no limits — a client-side tool with nothing to meter.
Yes. It runs in your browser, so Base64 Encode / Decode works on phones and tablets as well as desktop — there is no app to install.
Usually just a few seconds for a typical file — Base64 Encode / Decode starts working the moment you give it your input.
Casual use is unlimited, under a generous fair-use cap that keeps it fast for everyone.
All modern browsers — Chrome, Safari, Firefox and Edge. Base64 Encode / Decode needs nothing installed beyond the browser you already use.