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Base64 Encoder & Decoder — Online Tool for Text & Files

Encode and decode Base64 text or files. Supports standard and URL-safe variants. Free, no signup.

Free No signup Client-side Privacy friendly Updated

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.

What is Base64 Encoder & Decoder?

Base64 is a binary-to-text encoding (RFC 4648) that represents arbitrary bytes using 64 printable ASCII characters (A–Z, a–z, 0–9, plus two extras). The standard variant uses `+` and `/`; the URL-safe variant substitutes `-` and `_` so the output can travel through URLs and filenames untouched. A Base64 Encoder converts text or binary files to and from this representation.

How Base64 Encoder & Decoder compares to alternatives

Base64 Encoder & Decoder versus typical browser and desktop alternatives — features compared at a glance.
Feature Zerethon Tools Typical online tools Desktop apps
Files leave device No Yes (upload) No
URL-safe variant Yes Sometimes Yes
Binary file support Yes Sometimes Yes
Free Yes Yes (with ads) Often free
Signup required No Sometimes No
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

Privacy

Your data never leaves your browser unless explicitly stated. Base64 Encoder & Decoder runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

Base64 vs URL encoding

Learn the basics

What is Base64? What is URL encoding?

How-to guides

How to decode base64 How to encode a url

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