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?
This free tool converts any image file into a Base64-encoded string — a text representation of binary data. The resulting string can be embedded directly in HTML, CSS, JavaScript, or API payloads, eliminating the need for a separate image file or HTTP request. All conversion happens in your browser with no server uploads.
Why Convert Images to Base64?
Inline HTML/CSS
Embed small icons directly in your source code, removing HTTP requests and speeding up page loads for critical assets.
Email-Friendly
Embed images directly in email HTML to bypass restrictions in clients that block external image loading.
API Payloads
Pass images as JSON fields in REST or GraphQL APIs that expect Base64 data rather than multipart file uploads.
Self-Contained Files
Create single-file HTML documents with all images embedded, useful for offline viewing or email attachments.
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?
Copy the output string and use it as a CSS background: background-image: url("data:image/png;base64,ABC...");
2. Does Base64 encoding compress images?
No. Base64 actually increases file size by ~33%. It's a text encoding, not a compression algorithm. For performance-critical cases, only use it for small images like icons.
3. Are my images safe?
Yes. Conversion happens entirely in your browser using the JavaScript FileReader API. Your images are never uploaded to any server.