Compress JPG to 100KB
Compress JPG to 100KB online free for form photos and thumbnails. Keeps the best JPG quality that fits, in your browser: your images are never 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 JPG image to 100KB
Three steps, all in your browser.
Add your image
Drag and drop your JPG (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.
JPG is the format upload forms ask for most, and it compresses well: MonsterConvert lowers the quality only as far as needed, and shrinks the pixel size only if that isn't enough. Images in other formats (PNG, WebP, and so on) are converted to JPG, with any transparency filled in white.
What to expect at 100KB
As a rough guide, a typical photo saved as a JPG at 100KB is about 730 x 550 px. Simple images with flat areas can hold more pixels, and very detailed ones fewer.
Tips for getting to 100KB
- Start from the original file: re-saving an already compressed JPG down to 100KB again loses more detail each time.
- Photos and gradients suit JPG. For screenshots with small text at 100KB, check the result closely, or try WebP if the site accepts it.
- If 100KB still looks too soft, crop first: fewer pixels lets the quality stay higher.
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 JPG 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.
They are converted to JPG so they can reach the target size. JPG can't store transparency, so transparent areas are filled with white. The original file is never changed.
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.