Skip to content
AnyToolBox

Search tools

Find a tool by name or keyword

Base64 Encode & Decode

Encode text or files to Base64 and decode Base64 back to text or a file. UTF-8 safe, with URL-safe mode.

100% Client-Side

Type text to encode or paste Base64 to decode — or drop in a file to turn it into Base64.

How to use the Base64 Encode & Decode

  1. 1

    Choose Encode or Decode for text, or switch to the File tab.

  2. 2

    Type or paste your input — the result updates as you type.

  3. 3

    Turn on URL-safe mode to use - and _ instead of + and / and drop the = padding.

  4. 4

    Copy the output, or download decoded binary data as a file.

Frequently asked questions

Yes. Text is converted to UTF-8 bytes before encoding and decoded back as UTF-8, so accents, emoji and scripts like Arabic or Chinese round-trip correctly.

A variant that replaces + with - and / with _, and usually omits the trailing = padding, so the result can sit in URLs, filenames and JWTs without escaping. The decoder accepts both variants automatically.

If the bytes aren't valid UTF-8 — an image or a ZIP, for example — the tool says so and lets you download the decoded bytes as a file instead of showing garbled characters.

No. Base64 is an encoding that anyone can reverse instantly. It's for safely moving binary data through text-only channels, not for hiding secrets.

No. Files are read and encoded locally by your browser. Very large files make very large Base64 strings (about 33% bigger), so files up to 25 MB are accepted.

More developer tools

JSON Formatter & Validator

Pretty-print, minify and validate JSON with exact error locations, sorted keys and custom indentation.

100% Client-Side

JWT Decoder

Decode JSON Web Tokens to read the header and payload, check expiry, and verify HMAC signatures.

100% Client-Side

UUID Generator

Generate random v4 or time-ordered v7 UUIDs in bulk, and inspect any UUID's version and timestamp.

100% Client-Side

Missing a feature or tool?

Tell us what would make Base64 Encode & Decode more useful, or what to build next.