How to Use the File to Base64 Data URI & Binary File Reconstructor
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1
Drop any file into the upload zone to convert it to a Base64 string.
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2
Select output format: Raw Base64 string, CSS `url(data:...)`, HTML `
` tag, or Data URI.
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3
Or switch to the "Base64 to File" tab, paste a base64 string, and click "Download Reconstructed File".
Practical Example & Use Case
Common Real-World Scenario
Inlining a small SVG logo or WOFF2 webfont directly into a single CSS file to eliminate extra HTTP network requests.
Technical Notes & Limitations
Browser Engine Architecture
Fast in-browser FileReader API handles files up to 30 MB with zero server uploads.
Frequently Asked Questions
Does Base64 encoding increase file size?
Yes, Base64 encoding represents 3 binary bytes as 4 ASCII characters, causing approximately a 33% size increase.