Decode Base64 text and supported encoded data locally, with a dedicated decoding workspace and copy controls.
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format.
Common uses: Email attachments, embedding images in HTML/CSS, storing binary data in JSON, API responses.
Size overhead: Base64 encoding increases data size by approximately 33% due to the 6-bit to 8-bit conversion.
Supported formats: Text, images, documents, and any binary file type.
Inspect an encoded value from a test fixture or application payload without sending it to a decoding service. Select decoding, paste the Base64 content, and review the result. The output depends on whether the original bytes represent text or another supported data type.
Decode SGVsbG8gV29ybGQh to read Hello World!. If decoding fails, check for missing characters, an unexpected data-URL prefix, or a different Base64 alphabet.
Decoding does not authenticate the source or make a payload safe. Encrypted data remains encrypted after Base64 decoding, and arbitrary binary bytes may not produce readable text.
Select Encode or Decode for the task you want to perform. Enter text or open a supported file in the input panel. Review the result and copy or download it using the available output controls.
Decoding does not authenticate the source or make a payload safe. Encrypted data remains encrypted after Base64 decoding, and arbitrary binary bytes may not produce readable text.
No registration, no tracking of your content, no server uploads. Don't just take our word for it:
Your files and text are processed entirely on your device. Nothing is ever sent to us.
Once loaded, this tool keeps working with your Wi-Fi turned off. Try it.
Open your browser's DevTools → Network tab. You'll see zero requests carrying your data.
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