Base64 Encoder Decoder Online Free

100% in your browser — no libraries, no data sent to the server.

Encoding type

0 source characters → 0 Base64 characters

What is Base64 used for?

  • Embed images in CSS or HTML via a data URL.
  • Transmit files in a JSON API (Base64 string on client or server side).
  • Encode credentials for HTTP Basic Auth headers (Authorization: Basic …).
  • Store binary data in text-only formats (logs, metadata, etc.).

How it works

  1. Encode: choose text or file; text is encoded to UTF-8 then Base64, file becomes a complete data URL.
  2. Decode: paste raw Base64 or a data URL; line breaks are automatically removed.
  3. Result: image displayed if MIME is an image, text if readable UTF-8, otherwise binary download offered.

Frequently Asked Questions

How do I encode text to Base64?
Encode mode, choose "Text → Base64", enter your text: the result updates in real time.
How do I decode Base64 to text?
Decode mode: if the decoded content is valid UTF-8 text, it displays in the result area.
Can I encode an image to Base64?
Yes, use "File → data URL" and import your image (PNG, JPEG, etc.).
What is Base64 used for?
To transport bytes as safe text for JSON, XML, URLs, or email.
What is the maximum file size?
No limit imposed here: everything is local. A warning appears beyond 5 MB.