What a 100KB image looks like
At 100 KB a JPG photo of about 1000 by 750 pixels normally looks clean, with no obvious compression. That is plenty for a profile photo on a job portal, a listing image on a marketplace, or an inline image in an article.
Many online applications also use 100 KB as the limit for supporting documents and photos, so this is one of the most useful targets to have on hand.
How to compress a file to 100KB
Upload the image and keep the 100 KB target. JPG and WebP uploads keep their format, and PNG uploads default to JPG so the target applies. The tool encodes at the highest quality, then searches lower until the file fits under 100 KB. It only reduces the dimensions if the lowest quality is still too big.
Compare the result with the slider. When it looks right and the status says Under 100 KB, download it.
Compressing scanned documents to 100KB
Text needs more care than photos. JPG compression shows up as faint smudges around letters, and small print becomes hard to read. Crop the page to its edges, photograph or scan it in bright, even light, and resize it to around 1200 to 1600 pixels on the long side before compressing.
After compressing, zoom in on the smallest text in the preview. If it is hard to read, the document needs a larger limit. The 200 KB and 300 KB tools leave more room for multi-colored certificates and dense pages.
Profile and listing photos at 100KB
For a profile or listing photo, crop to the subject before compressing. A tight crop at 1000 pixels shows more of the face or product than a wide shot squeezed into the same 100 KB. Light matters as well: a bright, sharp photo compresses more cleanly than a dim, grainy one.