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Base64 File Encoder

Encoder

Encode any file to Base64 data string for embedding or decoding Base64 back to a file.

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File
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Click or drag file to encode

Any file type supported

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Upload a file to encode to Base64

A PDF, a font file, a zip archive, any binary file really, sometimes needs to travel somewhere that only accepts text, a JSON field in an API request, a config file, a database column typed as a string, and Base64 is the standard way to represent that binary data as plain text characters that survive being copied, pasted, or transmitted without corruption. This tool encodes any file into a Base64 string, or decodes an existing Base64 string back into its original file, working with any file type rather than just images.

See more about the Base64 File Encoder

Useful for embedding a small file's contents directly into a JSON API payload as a Base64 field, decoding a Base64 string received from an API back into a downloadable file, or converting a font or a document into a text-safe format for a system that can't accept binary uploads directly.

Key features

  • Clean interface
  • Fast processing
  • No signup required
  • Works offline

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Quick answers for Base64 File Encoder

Does this work with any file type, or just text?
Any file type. It reads the file as raw bytes via the FileReader API and Base64-encodes the binary data directly, so PDFs, images, zip archives, and executables all encode correctly, not just plain text.
How do I get my original file back from a Base64 string?
Switch to Decode mode and paste the Base64 text. The tool reconstructs the original bytes with atob and offers a direct download link, so you get the file back rather than just a text dump.
Is there a file size limit?
There's no hard cap in the tool itself, but very large files can be slow to encode and will produce a Base64 string roughly a third larger than the original file, since Base64 always expands binary data.