Base64 Encoder/Decoder — Encode & Decode Base64 Online (Free)

Encode and decode Base64 text or files online for free. Convert text to Base64 and Base64 to text instantly — all in your browser, no upload.

All tools run in your browser — nothing you process is ever uploaded.

How to Use

Choose a mode. Text works on whatever you type or paste. File works on a chosen file instead.
Type your content and press Encode, or paste a Base64 string and press Decode.
Copy the result, or download it in file mode.

Base64 turns binary or text data into a printable ASCII string, which is widely used for embedding images in HTML and CSS, carrying binary data in JSON, and encoding simple authentication headers.

All processing runs locally in your browser. Nothing you encode or decode is ever uploaded, so sensitive strings or confidential files can be handled safely. The tool works with standard Base64 that uses letters, digits, plus, slash and padding with equals signs.

Tips

Base64 is not encryption — it is just encoding. Anyone can decode the result, so never use it to hide passwords or private data. The encode output is roughly a third larger than the original input, which matters when you embed files into code or email.

For embedding a small image into a web page, File mode plus Encode gives you a data URI you can drop straight into your markup. Remember the encoded string grows as the file grows, so for large files a real hosting URL is usually a better choice than an inline data URI.

Why use it

Developers constantly need to encode or decode Base64 when working with inline assets, API payloads, and encoded configuration values. Doing it in the browser is instant, free and private, with no extensions to install and no files sent to a remote server.

FAQ

How do I encode text to Base64?

Switch to Text mode, type or paste your text, then press Encode. The Base64 result appears immediately and can be copied. Everything is processed locally in your browser, so your content is never uploaded.

How do I decode a Base64 string to text?

Paste the Base64 string into the input and press Decode. The decoded result is shown for copying. If the string was produced from text, it converts straight back to readable text.

Can I encode a file to Base64?

Yes. Switch to File mode and choose a file — the tool encodes its contents. This is useful for embedding images or other small assets directly into code and configuration.