Decode Base64
Decode Base64 strings, tokens, and data URIs back to plain text or downloadable files instantly in your browser.
How Base64 Decoding Works
Base64 decoding reverses the 6-bit lookup translation, converting groups of 4 ASCII characters back into 3 original raw data bytes. The result is parsed as a UTF-8 string or rendered as binary file media.
Frequently Asked Questions
- How do I decode a Base64 string?
- Paste your Base64 encoded string into the input box. The tool instantly converts the payload back into readable UTF-8 plain text or extracts image previews.
- Can I decode Base64 data URIs or images?
- Yes. If you paste a Data URI string (e.g. data:image/png;base64,...), the tool extracts the image and renders a live visual preview with a download option.
- Is my Base64 data secure?
- Yes! ToolsPixel performs 100% of the decoding inside your browser memory using native JavaScript TextDecoder. Nothing is transmitted over the internet.
- What causes an 'Invalid Base64' error?
- Invalid Base64 errors occur when input strings contain unexpected characters outside the Base64 set (A-Z, a-z, 0-9, +, /, =), or when string length padding is broken.