This free online Base64 to File decoder converts Base64 encoded strings back into their original binary files. Whether you need to extract an image from a CSS data URI, decode a Base64-encoded PDF, or convert any Base64-decode any binary data, this tool handles it all β entirely in your browser.
A data URI includes a prefix like data:image/png;base64, followed by the Base64 string. Raw Base64 is just the encoded data without any prefix. This tool handles both formats β it auto-detects the data URI prefix and extracts the MIME type, or you can manually specify the file type for raw Base64 strings.
Currently, the tool processes one Base64 string at a time. For multiple files, simply paste each string and decode it, then download the result before moving to the next one.
Yes. All decoding happens locally in your browser using the built-in atob() function and Blob API. Your Base64 data is never transmitted to any server. This makes the tool safe for decoding sensitive data like API keys, certificates, or private documents.
This usually happens when the Base64 string is incomplete or contains invalid characters. Make sure you've copied the entire Base64 string without truncation. Also verify that the MIME type is correct β a PNG decoded as JPEG will appear corrupted.
The limit depends on your browser and device memory. Most browsers handle Base64 strings up to 50MB (decoding to ~37MB files). For very large files, you may experience browser slowdowns or out-of-memory errors.