Free Developer Tool
Base64 Image Encoder
Upload any image and instantly convert it to a Base64 string, Data URI, CSS snippet, or HTML img tag. No upload to any server - everything happens in your browser.
Upload an image below to encode it to Base64. All processing happens locally in your browser - your image is never sent to any server.
📷Supports JPEG, PNG, GIF, WebP, SVG, BMP, ICO - max 5 MB
-Original size
-Encoded size
-Base64 chars
-Dimensions (px)
Output Format Reference
| Format | Best used for | Approx size vs original | Status |
|---|---|---|---|
| Data URI | HTML src, CSS url(), inline images | +33-37% | Recommended |
| Raw Base64 | REST APIs, JSON payloads, email attachments | +33% | Recommended |
| CSS background-image | Stylesheet background images, no-request icons | +33-37% | Situational |
| HTML img tag | Inline HTML, email templates, static pages | +33-37% | Situational |
Base64 encoding quick reference
Small icons/logos - great candidates for Base64 (reduces HTTP requests)
Email templates - inline Base64 avoids blocked external images
Size overhead - Base64 is ~33% larger than the original binary
Large photos - avoid Base64 for images over 100 KB in production
Privacy - your image never leaves the browser, zero server uploads
Caching - inline Base64 images cannot be cached by the browser separately
