Image to Base64 Converter
Convert images into Base64 data URIs for embedding in HTML, CSS, or JSON. Fast, private, and completely client-side.
Drop images here, or browse
PNG, JPEG, WebP, GIF, SVG, BMP
How to convert an image to Base64
- Drop your image onto the upload area.
- The Base64 data URI is generated instantly.
- Click Copy to copy the full data URI to your clipboard.
- Paste it into your HTML, CSS, or JSON file.
What is a Base64 data URI?
A Base64 data URI encodes an entire image file as a string of text. Instead of referencing an external file (<img src="logo.png">), you can embed the image directly: <img src="data:image/png;base64,iVBOR...">.
When to use Base64 images
- Email signatures: Embedded images render even when external files are blocked
- Single-file HTML: Bundle small icons into a standalone HTML file
- CSS icons: Use Base64 for background images without extra HTTP requests
- API payloads: Send images as JSON instead of multipart form data
When NOT to use Base64
- Large images: Base64 increases file size by ~33%, so it's only suitable for small assets
- Web performance: Base64 blocks HTML parsing; external files can load in parallel
- Caching: External images are cached by browsers; inline data URIs are not
- Rule of thumb: Only use Base64 for files under ~10 KB
Frequently asked questions
Is my image uploaded to a server?
No. Base64 encoding happens entirely in your browser using the FileReader API. Your image never leaves your device.
How do I use the Base64 string?
Copy the entire data URI (it starts with data:image/...) and use it anywhere you'd use a URL — in HTML src attributes, CSS url(), or JSON payloads.
Why is my Base64 string so long?
Base64 encoding uses 4 characters to represent every 3 bytes of data, so a 100 KB image becomes ~133 KB as text. That's why it's only recommended for small images.
Does Base64 affect image quality?
No. Base64 is a lossless encoding — the decoded image is bit-for-bit identical to the original.