Compress PNG to 20KB
Compress PNG to 20KB online free for signatures and ID photos. Shrinks by reducing pixels and keeps transparency, in your browser: nothing is uploaded.
Drag & drop images here
Everything happens in your browser: your images are never uploaded anywhere. You can also just paste (Ctrl/Cmd+V) an image or an image URL.
MonsterConvert lowers quality as little as it can to get the file at or under this size.
Resize first (optional)
Some forms ask for a pixel size as well as a file size. Set it here and the file size is fitted after resizing.
How to compress a PNG image to 20KB
Three steps, all in your browser.
Add your image
Drag and drop your PNG (or any other image), click to browse, or paste it from your clipboard.
Check the 20KB target
The target is already set to 20KB. Change it if you need a different size.
Compress and download
Click Compress and download a file at 20KB or under, with as much quality kept as possible.
When you need 20KB
20KB is the limit many application forms set for signatures and small ID or passport-style photos. At this size the image is usually a small, tightly cropped picture, so it helps to crop first and let the compressor shrink the rest.
PNG is lossless, so it has no quality setting to lower. The only way to make a PNG smaller is to reduce its pixel dimensions, and transparency is kept. If the site you are uploading to accepts JPG, the JPG version reaches the same size with far less visible loss.
What to expect at 20KB
As a rough guide, a typical photo saved as a PNG at 20KB is about 100 x 80 px. Logos, screenshots, and drawings with flat colors fit much more, and a photo saved as a JPG could be about 330 x 250 px at the same size.
Tips for getting to 20KB
- A PNG only reaches 20KB by having fewer pixels, so decide the smallest dimensions you can accept before compressing.
- If you don't need transparency and the destination accepts JPG, use the 20KB JPG page instead: the same size holds far more detail.
- Logos, icons, and screenshots with flat colors compress well as PNG. Photographs are the hard case.
Nothing uploaded
Compression happens in your browser using WebAssembly, so your photos and documents never touch a server.
Highest quality that fits
Instead of guessing a quality setting, it searches for the best one that keeps the file at 20KB or under.
Batch friendly
Drop in several images at once and compress them all to the same size in one go.
Related tools
Get the file ready first
Compress by quality instead
Frequently asked questions
Drop your PNG image into the box above and click Compress. MonsterConvert searches for the highest quality that still keeps the file at 20KB or under, and only shrinks the pixel dimensions if the quality alone can't get there. Then download the result.
It will be 20KB or smaller, as close to it as the search can get, which keeps as much quality as possible. It won't be padded up to the exact size. If your image is already under 20KB, it is returned unchanged.
Very large or very detailed images sometimes can't get under a small target without shrinking a lot. When that happens the row tells you it got as close as it could instead of pretending it hit the target. Try cropping away unneeded parts first, or set a larger target size.
PNG stores every pixel without loss, so there is no quality dial to turn down. The file only gets smaller if it has fewer pixels, which is why the compressor reduces the image's width and height until it fits 20KB. Choose the 20KB JPG page instead if a JPG is acceptable: it reaches the same size with much less visible loss.
Photograph or scan it on plain white paper in good light, crop closely around it, and compress it here. A tightly cropped signature a few hundred pixels wide fits in 20KB with room to spare.
20KB is a very small budget, so some detail has to go. The compressor lowers pixel size only as much as needed. Cropping to the face or the field the form asks for keeps the useful detail sharper.
Yes. Open "Resize first (optional)" under the size controls and set a fixed width, exact dimensions, or a percentage. The image is resized first, and the file size is then fitted to 20KB.
MonsterConvert uses 1 KB = 1,000 bytes, so the result stays under the limit whether a website counts a kilobyte as 1,000 or 1,024 bytes. The size shown next to your file uses the 1,024 convention, so it can look slightly lower than 20KB.
No. The image is compressed inside your browser using WebAssembly, so it never leaves your device. That makes it safe for ID photos and other private documents.
Yes. Turn on "Keep original dimensions" under the size controls. Only the quality changes then, so the image may end up a little over 20KB if the quality floor isn't enough.