Disclosure: some links to paid products on Filemere are, or may become, affiliate links. If you buy through one, we may earn a commission at no extra cost to you. That never decides what we list: free options are shown first, and every price is copied from the official page on the date shown. How we choose and how we earn.
Compress image to KB
Forms and portals often demand “max 100 KB” or “under 2 MB”. Type the limit, and the tool finds the highest quality that fits – shrinking the dimensions only if it must.
🔒 Runs in your browser – files are not uploaded
How it reaches the size
- It tries high JPEG/WebP quality first. If that already fits, you get it.
- Otherwise it searches for the highest quality that is still under your limit (7 test encodes).
- Only if even low quality is too big does it reduce the pixel dimensions, 15% at a time.
KB here means 1,000 bytes, the way most upload forms count. If a form uses 1,024 (KiB), aim 3% lower to be safe.
Tips for small targets (20–50 KB)
- Crop away background first; fewer pixels compress much better.
- For ID or passport-style photos, 600 × 600 px or smaller usually reaches 50 KB with good quality.
- Transparent PNGs are flattened onto white, because JPG has no transparency.
Desktop and paid alternatives
Free options first. Facts come from each official page on the date shown.
macOS Preview
- Merge, reorder, rotate and delete PDF pages
- Export images to PDF and convert image formats
- Mac only
Source: official page, checked 2026-11-05. Prices and limits change – confirm before buying.
Visit macOS Preview →Wondershare UniConverter
- Graphical converter + compressor with batch processing and GPU acceleration
- Official FAQ: the trial converts only 1/3 of a video's length
- Official store listed a Yearly Plan at US$45.99/yr (auto-renews) on the date checked
Source: official page, checked 2026-11-05 · official pricing. Prices and limits change – confirm before buying.
Visit Wondershare UniConverter →Questions
Why does my 100 KB image say 98 KB on Windows?
Windows counts 1 KB as 1,024 bytes. The file is the same; see our GB vs GiB calculator.
Is the photo uploaded?
No. The browser's own image encoder does all the work on your device.
Does it remove EXIF/location data?
Yes. Re-encoding through a canvas drops EXIF metadata, including GPS location.