Image to Base64 Converter - Free Online Tool
Image to Base64 Converter
Convert Any Image to a Base64 Data URI
Drag & drop an image, or click here
Understanding Base64 Image Encoding
Inline CSS/HTML
Embed small icons or images directly in CSS background-image or HTML src attributes without a separate file request.
JSON Payloads
Include image data directly in a JSON API payload when a separate upload endpoint isn't practical.
Email Templates
Some email clients support inline Base64 images, avoiding broken images when external image loading is blocked.
Local Processing
Your image is read entirely in your browser using the FileReader API — nothing is uploaded to a server.
The Base64 Size Tradeoff
Base64 encoding increases file size by roughly 33% compared to the original binary, since it represents every 3 bytes of data using 4 ASCII characters. For small icons and images (a few KB), this tradeoff is usually worth the convenience of embedding data inline. For larger images, a normal file reference is almost always more efficient — reserve Base64 encoding for genuinely small assets.
Key Takeaways
- Complete Data URI: Output includes the full
data:image/...;base64,prefix, ready to paste directly into HTML or CSS. - Any Image Format: Works with PNG, JPG, WebP, GIF, and other common image formats.
- Client-Side Only: All encoding happens locally in your browser — no data is ever sent to a server.