Convert text to Base64 encoding and decode Base64 strings instantly with instant validation.

Quick Answer

Base64 is a way of representing binary data using only 64 printable ASCII characters, so it can safely travel through text-based systems like email, URLs, or JSON. This tool encodes text to Base64 or decodes Base64 back to text, instantly and entirely in your browser.

What is Base64 encoding?

Base64 converts arbitrary bytes into a text-safe format using the characters A-Z, a-z, 0-9, +, and /. It's not encryption — it's an encoding, meaning anyone can decode it back to the original data. It's commonly used for embedding images in CSS/HTML, encoding credentials in HTTP Basic Auth headers, and representing binary attachments in email (MIME).

How to use this tool

Paste plain text into the input box to encode it, then click Encode to Base64.
Paste a Base64 string to decode it back to plain text, then click Decode from Base64.

Privacy

All encoding and decoding happens locally in your browser using JavaScript's built-in btoa/atob functions. Nothing you enter is sent anywhere.

FAQ

Is Base64 encryption?

No. Base64 is reversible by anyone with no key required — it provides no confidentiality. Don't use it to "hide" sensitive data.

Why does decoding sometimes fail?

The input must be valid Base64 (correct alphabet and padding). Extra whitespace, line breaks, or a truncated string will cause a decode error.

🔐 Base64 Encoder/Decoder