Quick answer
To compress an image to 100 KB, resize it to the dimensions you actually need, then lower the JPG or WebP quality until the file fits. FreeImageKit's Compress Image to Target Size does the search for you in your browser: it tries quality levels and keeps the best result under your limit. Nothing is uploaded.
Steps
- If the image is much larger than you need, resize it first with Resize Image.
- Open Compress Image to Target Size, enter 100 (or 200 or 500) KB and select your images.
- Download the results and check each file size and appearance. Use the ready-made 100 KB or 500 KB workflows for whole batches.
Resize before you compress
File size grows with pixel count. A 4000-pixel photo displayed at 800 pixels carries far more data than needed. Resizing to the real display size often gets most of the way to your limit before quality is touched.
Pick the right format
JPG and WebP are lossy, so quality controls size. WebP is often smaller than JPG at similar quality, but check that the form or system you are uploading to accepts it. PNG is lossless, so quality cannot shrink it: convert screenshots and photos to JPG or WebP to reach a small target.
Flat graphics are different
Logos, text and screenshots with sharp edges can show visible artefacts when pushed to a very small JPG. For those, reduce the dimensions or colours instead, or accept a slightly larger limit.
Check the size the way the form does
Some forms count 1 KB as 1000 bytes and others as 1024. Aim a few percent under the limit, and confirm the size in your file manager before uploading.
Frequently asked questions
How do I compress an image to under 500 KB?
Use Compress Image to Target Size with a 500 KB target, or the Compress Images Under 500 KB workflow for a batch. Both search for the best quality that fits the limit.
Why is my PNG still too large?
PNG is lossless, so lowering quality does not apply. Convert it to JPG or WebP, or reduce its dimensions.
Will the image still look good at 100 KB?
It depends on dimensions and content. A photo shown at a few hundred pixels usually looks fine at 100 KB, while a large detailed photo will show visible loss.
Try the related local tools
Keep reading
Last updated
This guide describes format behaviour and product capability, not a guarantee for every source image or third-party workflow. Keep your original files and verify important exports.