Compress an image
Make a file smaller. Start with a target size if a form gave you one, a preset if you just want it lighter, or the quality slider if you want to drive it yourself.
Compress tools
3 tools
- Compress to Exact Size
50 KB or less
Give it a target and it finds the highest quality that still fits under it.
- Image Compressor
light · balanced · strong
Three presets, no numbers to pick, for when you just want it smaller.
- Quality Changer
quality 1–100
Set the encoder quality yourself and see what it costs in bytes.
Which one do you want?
If something gave you a number — a portal that will not accept a file over 100 KB, an attachment limit, a form that says “max 50 KB” — use Compress to Exact Size. It searches for the highest quality that still fits under the number and never hands back a file above it.
If nobody gave you a number and the file is simply too big to send, use Image Compressor. Three presets, one click, no arithmetic.
If you already know what JPEG quality means and want to set it yourself, use Quality Changer. It re-encodes at exactly the number you pick and then reports the size that produced, rather than promising a size in advance.
Why PNG behaves differently
A PNG cannot be squeezed toward a target the way a JPG can. The browser ignores the quality argument for PNG entirely, so there is no dial to turn — the format is lossless by definition. Image KB Reducer works down a different ladder instead: lossless optimisation first, then colour quantisation, then dimensions, and only then does it offer WebP. It will never change your format silently to make a number work.
If nothing in the image needs to be transparent, a screenshot or diagram is usually far smaller as a JPG or a WebP than any amount of PNG optimisation can achieve.
If a form gave you a number
These are the sizes people are asked for most often, and each has its own page — because what asks for 20 KB (a signature box) and what asks for 200 KB (a scanned certificate) are different problems with different answers, not the same problem at a different scale.
All of it runs here
Every tool on this page decodes and re-encodes inside your browser tab. Your image never leaves your device — there is no upload step, no queue, and no server that could keep a copy. The privacy policy explains the mechanism, names every third-party request the site makes, and shows you how to check it in DevTools.
Other tools
- Resize4 tools
- Change how big the picture is, in pixels or in millimetres. Two of these exist because application forms ask for physical sizes and a byte cap in the same sentence.
- Convert6 tools
- Change the format. The pairs below are the five conversions people actually search for; the generic converter covers everything else your browser can encode.
- Edit4 tools
- Change the picture itself, or what the file says about you. Remove Metadata is here because a photo carries a GPS fix and a camera serial number until something takes them out.