Base64 File Converter (Encoder & Decoder)
Convert images, PDFs, documents, or raw text to Base64 data strings and decode back to files in real-time
A local, client-side tool to securely encode any file into Base64 format (either raw string or Data URL for HTML/CSS embedding) and decode Base64 data back to physical files.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Upload or drop your files to encode them into Base64 string formats.
- Switch to the Decoder tab, paste a Base64 payload, and let the parser detect the MIME type.
- Preview decoded images, configure a file name, and download the resulting file locally.
FAQ
- Why does Base64 encoding increase file size?
- Base64 encodes 8-bit binary data using 6-bit characters (64 printable characters), which results in a roughly 33% size overhead compared to the raw file.
- Is my data sent to any server?
- No. All file processing, encoding, and decoding occur 100% locally inside your web browser. No data leaves your machine.
- Can I convert very large files too?
- Since the conversion happens entirely in the browser's memory, large files technically can be processed, but once a file grows into the tens or hundreds of megabytes, the tab can slow down or freeze. In practice, this is best suited for images, icons, and small documents in the low-single-digit-MB range.