Where 300 KB limits come from
Some university web teams use 300 KB as the everyday limit for photos. Two examples, checked October 30, 2026:
- Stony Brook University’s web support guide recommends under 300 KB for most images and under 150 KB for thumbnails.
- Murdoch University’s web guidelines say most images shouldn’t be more than 200 to 300 KB.
Resize first, then compress
A very large photo has to lose a lot of quality to reach 300 KB. Set a width under “Resize” first (for example 1,200 pixels for an image in a page column), and the tool can keep the quality higher. Always check the limit on the site you’re uploading to, since it may differ.
Need a different limit? Try 200 KB, 500 KB, 1 MB or any size.