Compress PNG to 100KB
Compress PNG to 100KB online free for form photos and thumbnails. 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 100KB
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 100KB target
The target is already set to 100KB. Change it if you need a different size.
Compress and download
Click Compress and download a file at 100KB or under, with as much quality kept as possible.
When you need 100KB
100KB is a frequent limit for photo and document uploads on registration forms, and a good budget for a web thumbnail or blog image that needs to load instantly.
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 100KB
As a rough guide, a typical photo saved as a PNG at 100KB is about 230 x 170 px. Logos, screenshots, and drawings with flat colors fit much more, and a photo saved as a JPG could be about 730 x 550 px at the same size.
Tips for getting to 100KB
- A PNG only reaches 100KB 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 100KB 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 100KB 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 100KB or under, and only shrinks the pixel dimensions if the quality alone can't get there. Then download the result.
It will be 100KB 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 100KB, 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 100KB. Choose the 100KB JPG page instead if a JPG is acceptable: it reaches the same size with much less visible loss.
Usually yes for a single page photographed straight-on. Text stays legible if the original is sharp, but very small print can blur, so check the result before uploading.
JPG is accepted almost everywhere. WebP is smaller at the same quality, which helps on web pages, but many upload forms only take JPG or PNG.
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 100KB.
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 100KB.
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 100KB if the quality floor isn't enough.