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Base-N Encoder — Base16, Base32, ASCII85, Base91 Online

Encode and decode Base16, Base32 (RFC 4648), Base32 Crockford, Base85 (ASCII85), and Base91 in your browser.

Free No signup Client-side Privacy friendly

How to use

  1. 1 Pick a base — Base16, Base32, Base32 Crockford, Base85, or Base91.
  2. 2 Toggle Encode or Decode.
  3. 3 Paste input — UTF-8 text on encode, encoded string on decode.
  4. 4 Copy the output. Use Swap to flip input ↔ output instantly.

Why use this tool

  • Five bases in one tool — no need to find a separate page per encoding.
  • Crockford Base32 — human-friendly, no I/L/O/U, case-insensitive on decode.
  • Base85 — denser than Base64, used by Adobe PDF and Git.
  • Base91 — denser still, useful for QR/print data limits.
  • Pure client-side. No upload.

Frequently asked questions

Which Base32 variant is here?

Both. RFC 4648 (alphabet A-Z, 2-7, padded with =) for compatibility with OTPAUTH URIs and similar. Crockford Base32 (alphabet 0-9, A-Z minus I/L/O/U) for human-readable identifiers — case-insensitive and tolerant of O→0, I/L→1.

What about URL-safe Base64?

Use our dedicated Base64 Encoder & Decoder — it has a URL-safe variant toggle and supports file → Base64 mode.

Why does Base85 wrap with <~ and ~>?

Adobe ASCII85 specifies those delimiters. They are optional on decode — we strip them if present.

Why is Base91 not standardized?

It is Joachim Henke's 2000 design. Not an IETF standard, but the algorithm and alphabet are stable and widely implemented when extra density is required.

Summary

Base-N Encoder & Decoder is a free developer utility by Zerethon Tools. Encode and decode Base16, Base32 (RFC 4648), Base32 Crockford, Base85 (ASCII85), and Base91 in your browser. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

Privacy

Your data never leaves your browser unless explicitly stated. Base-N Encoder & Decoder runs entirely client-side — no server upload, no logging, no tracking of your input.

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