Base64 File Converter

Convert files to Base64 and decode Base64 back to downloadable files entirely in your browser.

Browser-only

All conversion happens on this device. Your files and Base64 content are never uploaded.

Encode file to Base64

Choose a file or drop it below to generate a raw Base64 string.

Drag and drop a file here Any file type is supported, including images, PDFs, fonts, archives, and certificates.
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Decode Base64 to file

Paste Base64 to reconstruct the original file and download it.

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When to use this Base64 file converter

These common workflows match the way developers and IT teams use Base64 with real files:

  • Embed an image in an email template

    Convert a logo or icon to Base64 so you can inline it in HTML email without depending on external hosting.

  • Inspect a Base64-encoded certificate

    Paste encoded certificate data, reconstruct the file, and open it locally with the tool you already trust.

  • Inline a font in CSS

    Convert WOFF or WOFF2 files to Base64 for experiments with @font-face or single-file demos.

  • Verify encode-to-decode round trips

    Encode a file, decode the Base64 back to bytes, and compare the result when you need confidence in the workflow.

  • Extract binary content from API payloads

    Save Base64 attachments from JSON responses as real files without writing a one-off script.

Frequently Asked Questions

How do I use this app?
Enter or paste the required input, adjust any options, run the primary action, and review the result. Use the Clear/Reset control to start over.
Is this app free to use?
Yes. The app is free to use and does not require an account.
What happens to my input data?
The app MUST NOT store user-provided input. If any network request is required for a feature, the app MUST clearly disclose it in the Help section.
Why am I getting an error or unexpected output?
Most issues come from invalid input or incompatible options. Verify the input format, try the default settings, and use Clear/Reset before trying again.
Where can I find instructions and troubleshooting tips?
Use the in-app Help panel. It MUST explain inputs, options, and common mistakes, and it MUST be usable with a keyboard (including closing with Escape).