Base64 Encoder / Decoder
Encode text or files to Base64, or decode Base64 strings.
What is the Base64 Encoder / Decoder?
Base64 is a way of representing binary or text data using only a limited set of 64 printable ASCII characters (A-Z, a-z, 0-9, plus + and /). It is widely used whenever data needs to travel through channels that were designed for plain text, such as email attachments, JSON payloads, data URIs in HTML and CSS, and HTTP headers. This tool lets you convert plain text to Base64 and back, and also encode any file you select into a Base64 string.
It is built for developers, students and anyone who works with APIs or web markup. If you have ever needed to embed a small image directly in a stylesheet, debug an API response that contains an encoded token, or quickly check what a Base64 blob decodes to, this tool gives you an instant answer without installing anything.
How to use it
Choose the Encode or Decode tab depending on which direction you need. To encode text, type or paste it into the input box and press Encode; the Base64 result appears below ready to copy. To decode, paste a Base64 string and press Decode to recover the original text. The decoder handles full Unicode, so accented letters and emoji round-trip correctly.
To encode a file, switch to the Encode tab and use the Encode File button. The file is read in your browser and converted to its Base64 representation, which is handy for creating data URIs or embedding small assets. Use the Copy button to place the result on your clipboard in one click.
Notes and tips
Base64 is encoding, not encryption. It does not hide or protect your data in any meaningful way because anyone can decode it instantly, so never treat it as a security measure. Its only purpose is to make binary-safe data text-safe. Also remember that Base64 increases size by roughly one third, so it is best suited to small payloads rather than large files.
If decoding fails, the input is probably not valid Base64 - check for missing padding characters, stray spaces, or URL-safe variants that use - and _ instead of + and /. The tool reports a clear error when the string cannot be decoded.