About Us

Base64Deco · The Letterpress Foundry

Base64Deco is a free online Base64 encoder and decoder. It exists because the Base64 pain you hit in the real world is never the textbook version: it is Chinese text turned to mojibake by atob(), an emoji that breaks a JSON payload, a JWT you need to peek inside, or an image that has to travel as a data URL. Those jobs deserve a tool that just works.

What the Tool Does

Paste anything — text, a Base64 string, or a data:image URL — and the foundry casts it the right way. Three ideas shaped every design decision:

  • The bridge comes first. Native atob() and btoa() treat characters as single bytes, which mangles every multi-byte language. Every conversion on this site passes through TextEncoder and TextDecoder, so 你好 and 🎉 survive every round trip.
  • The tool should guess intelligently. Most converters make you pick a direction before you understand your own input. Base64Deco sniffs the format: data:image payloads get a preview card, Base64 gets decoded, plain text gets encoded — and ambiguous inputs are settled by a test-decode.
  • Images are part of the job. The Image Workshop draws your upload onto a Canvas, extracts the RGBA pixel data, and re-encodes it as a standard data URL you can paste straight into an <img src> — with format and quality control.

Our Approach

A conversion tool must itself be trustworthy. That is why everything runs in your browser:

  • No uploads. Your text, tokens, logs and images are processed locally with JavaScript and never sent to any server.
  • No sign-up. No accounts, no email walls, no watermarks.
  • No stored history. Close the tab and everything is gone.

The Name

"Base64Deco" pairs the encoding with its two directions — encode and decode. The site is styled like a letterpress foundry because that is the mental model: the Base64 alphabet is a type case of exactly 64 sorts, and encoding is casting raw bytes into lines of type. When the type is set correctly, any machine can read the message back.

Get in Touch

Found a payload that converts incorrectly, or have an idea that would speed up your workflow? We would love to hear from you — visit our contact page and drop us a line.