Secrets and encoding

How to encode text as Base64

A header, a basic-auth toy, or a data URL needs Base64. Encode it on Base64 Encode and Decode.

Ben Fidge · Oct 2026 · 4 min read

What to run

Open Base64 Encode and Decode. It stays in the browser.

Output is ASCII.

Padding = is normal.

Unicode is included, so a round trip should match.

Base64 is not encryption.

Open URL Encoder if the Base64 must sit in a query string. +, /, and = are unsafe there. It stays in the browser.