Image to Base64 Encoder
Convert images to Base64 strings. Upload any image format, get Base64 data URI for CSS or HTML.
Drop an image or click to upload
JPG, PNG, GIF, WebP — best for small graphics (< 5KB)
About Image to Base64 Encoder
Convert any image file to a Base64-encoded data URI string. Upload JPG, PNG, GIF, SVG, or WebP and get the full data:image/png;base64,... string ready to paste into HTML img src, CSS background-image, or JavaScript. Shows original file size vs Base64 string size (Base64 adds ~33% overhead). All conversion happens using the browser's FileReader API — images never leave your device.
All processing happens entirely in your browser using modern web APIs. Nothing is uploaded to our servers — your data stays local and private. Free to use forever.
Common use cases
- Embedding a logo or icon directly in an HTML email without external image hosting
- Including a small image in a CSS file as a background without an extra HTTP request
- Storing image data in a JSON API response or localStorage
- Creating self-contained HTML files with all images embedded
- Using an image as the src attribute in a data URL for canvas or PDF generation
How it works
Uses the browser's FileReader.readAsDataURL() method, which reads the file as an ArrayBuffer and encodes it as a Base64 string with the correct MIME type prefix (e.g., data:image/png;base64,). The conversion happens synchronously in the browser's rendering engine — no server or network required.