Image to Base64 Online for CSS and HTML
Base64 lets small images be embedded directly in code. Convert a file into text without sending it to a server.
Base64 turns binary image data into text that can be embedded in CSS, HTML, or JSON. Use the image to Base64 converter to get a string you can paste.
When to use it
The technique works well for small icons, simple logos, and assets that must travel inside a single HTML file. Data URIs also simplify prototypes and basic HTML emails.
- Use it for small images so file size does not balloon.
- Prefer WebP or SVG when supported.
- Avoid Base64 for large photos.
- Keep the original file for future edits.
Watch the size
Base64 adds about one third to the data size, and embedded images are not always cached separately. For large assets, keep using normal image files. After converting, paste the string into your code and test the page in a browser.
An alternative for large assets
For images that change often, keep them as separate files so the browser can cache them. Base64 works better for small assets that rarely change and must arrive in a single request. Test the page speed after pasting the string.
Frequently asked questions
Is Base64 suitable for large photos?
No. The data grows larger and the page can become slow.
Which formats are supported?
PNG, JPG, WebP, GIF, and SVG, depending on the file you select.
Does the data size increase?
Yes, by roughly one third compared with the original file.
Is the image uploaded?
No. Conversion runs in the browser and the file is not sent to a server.