Helpful Toolbox

Base64 Encoder / Decoder

Encode or decode Base64 in a blink — UTF-8 safe and totally private.

📖 How it works & FAQ

What Base64 actually does

Base64 takes raw bytes and rewrites them using only 64 safe characters: A–Z, a–z, 0–9, plus + and /, with = used as padding at the end. It isn't encryption and it isn't compression — in fact the output is about 33% larger than the input, because every 3 bytes become 4 characters. The point is portability: it lets binary or tricky text survive being pasted into places that only expect plain ASCII.

When you'd reach for it

Developers hit Base64 constantly. It shows up in data: URIs that embed a small image straight into HTML or CSS, in JSON Web Tokens (the header and payload are Base64url), in email attachments (MIME), in HTTP Basic Auth headers, and in config files that need to carry a certificate or key on a single line. If you've ever seen a wall of text starting with iVBORw0KGgo, that's a Base64-encoded PNG. Decoding it here turns the gibberish back into something you can read or verify.

A quick worked example

Encoding the word Hi gives SGk=. The single trailing = tells you the original ended one byte short of a clean group of three. This tool is UTF-8 safe, so accented letters and emoji encode and decode correctly instead of turning into mangled question marks — a common bug when code uses naive byte handling.

How to use it

  1. Pick your direction: Encode to turn plain text into Base64, or Decode to turn Base64 back into readable text.
  2. Paste or type your text into the input box.
  3. The result appears instantly in the output box — copy it with one click.
  4. To reverse what you just did, switch modes and paste the result back in.

FAQ

Is Base64 a way to hide or secure data?
No. Anyone can decode it in seconds — this very page will. Use it for transport, never as a password or a substitute for real encryption.
Why does my decode fail or look wrong?
Usually the string is truncated, has missing = padding, or contains stray spaces or line breaks. Base64url also swaps +/ for -_, so a token from a JWT won't decode as standard Base64 without adjustment.
Is my text private?
Yes — everything runs inside your browser and nothing you paste is ever uploaded to a server.
Is it free?
Completely free and supported by the ads on the page.