5 Tips for Working with Base64 Images

5 Tips for Using Base64

1. Encode only small images

Icons, markers, decorative elements up to 2-5 KB are ideal candidates for Base64. It is better to upload large photos as separate files.

2. Compress before encoding

Base64 increases the size by a third. Compress the image first, then encode - this minimizes the final volume.

3. Use CSS for background elements

Small patterns and textures in the `background-image` CSS property save HTTP requests and speed up the first render.

4. Don’t use it thoughtlessly in email campaigns.

Some email clients block Base64 images. Test on different clients before shipping.

5. Consider safety

Base64 string is just an encoding, not an encryption. Sensitive images are still available for decoding.

Comparison of approaches

See also: Image compression, SVG editor