Image to Base64
Convert any image to a Base64-encoded string. Copy the output for use in CSS, HTML, or APIs.
Drop images here or click to browse
Supports JPEG, PNG, WebP, GIF, BMP, SVG
Max 50MB per file
What is an Image to Base64 Converter?
Why Convert Images to Base64?
Inline HTML/CSS
Email-Friendly
API Payloads
Self-Contained Files
Common Use Cases
- Embed favicon or logo in CSS as a
background-image: url(data:...) - Inline small PNGs or SVGs in HTML
<img src="data:image/..."/> - Pass image data to AI/ML APIs (OpenAI Vision, Gemini, Claude)
- Store images in databases as text (Base64 strings in JSON/SQL)
- Generate QR codes or canvas drawings embedded in pages
- Include images in JWT tokens or other text-based protocols
Technical Specifications
| Parameter | Details |
|---|---|
| Supported formats | JPEG, PNG, WebP, GIF, BMP, SVG |
| Output format | Data URI (data:image/[type];base64,...) |
| Max file size | 50 MB per image |
| Size increase | ~33% larger than original binary |
| Processing | Client-side via FileReader API |
Frequently Asked Questions
1. How do I use the Base64 string in CSS?
You can use the generated string as a background-image by wrapping it in url(). Example: background-image: url('data:image/png;base64,iVBORw0KG...');. This is great for small icons or repeated assets.
2. Does Base64 encoding compress images?
No. In fact, Base64 encoding typically increases file size by about 33%. It is an encoding method, not a compression algorithm. For large images, it is usually better to host the file normally to avoid bloating your HTML or CSS files.
3. Is my image data sent to any server?
No. The conversion happens 100% locally in your browser using the JavaScript FileReader API. Your images never leave your device, ensuring total privacy.
4. What image formats are supported?
We support all common image formats including JPEG, PNG, WebP, GIF, and SVG. The tool automatically detects the MIME type and includes the correct Data URI prefix for you.
5. When should I avoid using Base64 for images?
Avoid Base64 for large photos or high-resolution assets. Since it increases file size and prevents the browser from caching the image separately from the HTML/CSS, it can negatively impact your Core Web Vitals (like LCP) if overused.