Base64 / URL / Hex encoder

Encode and decode Base64, URL (percent) encoding, hex and HTML entities — on UTF-8 bytes, so non-ASCII text survives intact. Runs entirely in your browser.

Format

Direction

Input

Output

Computed locally in your browser. Base64/Hex work on UTF-8 bytes, so non-ASCII text survives intact.

What this shows

Base64 — the padding-based encoding used in headers, JWTs and data URLs.
URL (percent) encoding — what encodeURIComponent does, and why a space becomes %20.
Hex — byte-level hex, handy when you are comparing captures.
HTML entities — escaping text for HTML.

Related reading: endianness in practice, and JWT pitfalls.