← Utilities

Base64 Encoder & Decoder

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Convert text to Base64 or decode it back, with an optional URL-safe alphabet — runs in your browser, nothing uploaded.

How it works

  • Encode turns text into Base64 using the browser’s native btoa, with a UTF-8-safe path so emoji and non-Latin characters round-trip correctly (plain btoa only handles Latin1 on its own).
  • Decode reverses that, and auto-detects whether the input uses the standard alphabet (+ /) or the URL-safe one (- _, no padding) — you don’t have to specify which.
  • URL-safe mode (encode only) swaps +// for -/_ and drops the trailing = padding — the RFC 4648 §5 alphabet used in URLs, filenames, and JWT segments (see the JWT Decoder).

Runs entirely in your browser — nothing you paste here is uploaded, logged, or stored, and there’s no autosave. Base64 is an encoding, not encryption — anyone can decode it, so it’s not a way to hide sensitive data.

🔑 Also try: JWT Decoder → 🔗 Also try: URL Encoder & Decoder →