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Base64 Encoder / Decoder

Instantly encode or decode Base64 text, right in your browser.

Free & instant No signup How to use FAQ

Enter text or Base64

Not sure what to enter?

Enter text below to instantly encode or decode it as Base64 - entirely in your browser, nothing is sent to our servers.

What is Base64 encoding?

Base64 turns any text or binary data into a string of 64 safe ASCII characters, so it can travel through systems that only handle text - email attachments, data URLs, API payloads and HTTP Basic authentication. It is encoding, not encryption: anyone can decode it.

How to encode or decode Base64

Type or paste your text into the box above.
Click Encode to convert it to Base64, or Decode to turn Base64 back into text.
Check the result in the output box.
Click Copy Result - and never rely on Base64 to hide passwords or secrets.

Related checks

To encode text for use in a URL, use the URL Encoder / Decoder.
JWTs are Base64URL-encoded - read one with the JWT Decoder.

Base64 represents any data using 64 printable characters (A-Z, a-z, 0-9, + and /), with = used as padding at the end. It appears in data URIs, email attachments, HTTP Basic authentication headers, and - in a URL-safe variant - in JSON Web Tokens. Text is converted to UTF-8 before encoding, so accented characters and emoji survive the round trip. Base64 is an encoding, not encryption: anyone can decode it, so it must never be used to hide passwords or secrets. JustChecker builds tools that respect your data - this one never leaves your browser.