Compress Image to 100KB
Compress an image to 100KB online free for form photos and thumbnails. Works with JPG, PNG and WebP, and runs 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 image to 100KB
Three steps, all in your browser.
Add your image
Drag and drop a JPG, PNG, or WebP file, click to browse, or paste it from your clipboard.
Check the 100KB target
The target is already set to 100KB. Change it, or pick a different output format, if you need to.
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.
What to expect at 100KB
As a rough guide, a typical photo at 100KB is about 730 x 550 px as a JPG, but only about 230 x 170 px as a PNG, because PNG keeps every pixel without loss. Logos, screenshots, and drawings with flat colors fit far more.
Tips for getting to 100KB
- Start from the original, not a copy that was already compressed: repeated compression loses more quality.
- Photos with soft backgrounds reach 100KB with little visible change; screenshots with text may look better as PNG or WebP.
- Compress several images at once to give them all the same limit.
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 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.
Leave it on Auto for most cases. JPG and WebP files stay in their own format. PNG, BMP and ICO files are converted to JPG, or to WebP if they contain transparency, because those formats can't be squeezed by lowering quality. Choose JPG when a form asks for JPG, or PNG if you must keep it (PNG can only get smaller by reducing the pixel size).
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.