Base64 Encoder & Decoder

About this tool

Base64 represents binary data using just 64 plain text characters: A-Z, a-z, the digits 0-9, plus two symbols. It exists because some systems only know how to handle text, so anything binary (an image, a file, a cryptographic key) gets translated into that alphabet before it can travel through email attachments, data URIs, HTTP Basic auth headers, or a field inside JSON or XML.

This tool goes both ways. Encode mode turns your text into Base64, handling UTF-8 properly so emoji and non-Latin scripts survive the round trip intact. Decode mode reverses it. It tolerates line breaks, missing padding, and the URL-safe alphabet that swaps in - and _ for the usual + and /, and it'll strip a leading data:...;base64, prefix if one's there.

You can encode a whole file too, which is the quickest way to get a ready-to-use data URI for a small icon or image. One thing worth remembering: Base64 inflates size by about a third, so it suits small assets, not large files. And it's worth saying plainly, Base64 is encoding, not encryption. Anyone can decode it in seconds, so it has no business hiding a password or a secret.

Everything above runs locally. Nothing you paste or upload leaves the browser.

How to use

1. Paste your text or Base64 string into the input box.
2. Click Encode to convert text to Base64, or Decode to convert Base64 back to text.
3. Tick URL-safe if you need the variant that is safe for URLs and filenames.
4. To convert a file, use Encode a file and pick it from your device. You can copy the Base64 text or the full data URI.
5. Use Swap to move the output back into the input and continue converting.