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How to use

  1. 1 Pick Encode or Decode.
  2. 2 Paste text or upload a file (up to 5MB).
  3. 3 Toggle URL-safe Base64 if you need a variant compatible with URLs and filenames.

Why use this tool

  • Full Unicode support — emoji and CJK characters encode correctly.
  • URL-safe variant — replaces + / with - _ and strips padding.
  • File-to-Base64 mode for embedding small images / binary in JSON or data URLs.
  • Runs in your browser — your data never reaches our servers.

Frequently asked questions

What is URL-safe Base64?

Standard Base64 uses + / = which break in URLs and filenames. URL-safe Base64 (RFC 4648 §5) replaces + with -, / with _, and removes padding =. Used in JWT, OAuth state, and many web APIs.

Can I encode files?

Yes — click "File → Base64" to upload. Max 5MB to keep the browser responsive. For larger files, use a streaming command-line tool.

Is Base64 encryption?

No — Base64 is reversible encoding. Anyone can decode it. Use it only for transport, never for hiding sensitive data.

AI Summary

Base64 Encoder & Decoder is a free developer utility by Zerethon Tools. Encode and decode Base64 text or files. Supports standard and URL-safe variants. Free, no signup. Runs entirely in the browser — no signup, no upload.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

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