About Yo! Base64 Decode

Yo! Base64 Decode is a free online tool for quick, reliable Base64 decoding. I build developer tools for a living and write about web development and security at techearl.com. This one scratches an itch I had for years: a decoder that runs entirely in the browser, handles the awkward cases (padding, URL-safe input, files), and doesn’t make me wonder where my data went.

Why I built it

I decode Base64 constantly, JWT payloads, API responses, config blobs, and I was always reaching for whatever site came up first. I wanted my own: no uploads, no tracking of what I paste, and room to add the exact features I need. Years later, I finally built it.

What it does

• Fast Base64 decoding to text or files
• UTF-8 and other character sets, with auto-detect
• URL-safe Base64 (the -_ alphabet used in JWTs)
• File upload for larger payloads
• Local decode history kept only in your browser

Privacy and security

Privacy is the point. Decoding happens locally in your browser, so what you paste never reaches a server, unless you deliberately use the API. I don’t store, transmit, or analyze your input or its output. Worth repeating: Base64 is encoding, not encryption, so never treat a decoded string as a secret.

How it stays free

Minimal, relevant ads and the occasional affiliate link to other developer tools cover server and maintenance costs. I keep both unobtrusive so the tool stays genuinely useful.

Get in touch

I’m always improving this. Feedback and feature requests are welcome at [email protected].