Compress an image to 100 KB
Bring a photo down to 100 KB in your browser for strict forms and small email fields. Nothing is uploaded. Preview it before you download.
Files are processed in your browser and are not uploaded. Free account: 20 images a day, 10 at a time, 20 MB each.
Related tools
If the form allows more, the picture will look better at 200 KB or 1 MB. The open-ended compressor is Compress an image. Discord is a megabyte problem, not a 100 KB one: compress for Discord.
How to compress an image to 100 KB
- 1Drop the photo onto the box. The target is already 100 KB. You can edit the number if the form said something else.
- 2Click Compress to 100 KB. The browser tries JPEG quality first, then a smaller pixel size if it must.
- 3Look at the preview. If text has fallen apart, the limit is too low for that image — crop it or ask whether 200 KB is allowed.
- 4Download. A file that was already under 100 KB is returned unchanged.
Where a 100 KB limit comes from
One hundred kilobytes is an old, stubborn ceiling. It shows up on government and university forms that were specified years ago, on some CMS “featured image” fields, on email signatures, on marketplace thumbnails, and in instructions that say “keep it under 100KB” without saying whether they mean a passport crop or a full scene. The number is decimal here: 100,000 bytes, so a checker that counts that way still accepts the file.
A 12-megapixel phone photo is several megabytes. Hitting 100 KB means both a lower JPEG quality and, usually, fewer pixels. Faces stay recognizable more often than fine text does. Foliage, fabric, and screenshots of a spreadsheet go soft. This is not a print file. A lab that asks for a 4×6 wants megabytes, not this cap. If the form will take 200 KB, use that and keep the detail.
The search stops around a short edge of a few hundred pixels rather than producing a speck. If it still cannot get under 100 KB, the result says so and gives you the smallest honest file. Cropping to the part the form actually needs — a face, a document corner — is more effective than hoping a landscape will survive.
What you should not expect
- Sharp small type. A screenshot of a UI is the image this limit treats worst.
- Transparency. The 100 KB file is a JPG on white.
- The original dimensions. A full-resolution photo that is also 100 KB does not exist in any useful sense.
- An upload. The search runs in the browser. GPS is not copied into the JPG you submit.
- The cap is filled in. 100 KB is 100,000 bytes, ready when the page loads.
- Preview before you submit. The picture you see is the file the form will receive.
- It gives up cleanly. The page will not shrink past a readable floor without telling you.
- Free account. Free batch, local processing, nothing sold on this page.
Frequently asked questions
Why does my photo look blurry at 100 KB?
Because 100 KB is not enough for a large photograph. The tool lowers JPEG quality and then the pixel count. That is the trade the form asked for. If the result is unusable, the limit is the problem. Try 200 KB or crop first.
Is 100 KB the same as 100 KiB?
No. This page uses decimal kilobytes, 100,000 bytes, which is what most web forms mean. A binary kibibyte limit of 102,400 bytes is slightly looser, so a file that passes here still passes there.
The file was already 80 KB. What happens?
It is kept. Re-encoding a file that already fits would only add artifacts. The result says the original was kept.
Can I compress a PNG screenshot to 100 KB?
You can, and the output will be a JPG. Text will suffer first. If the screenshot is a logo with transparency, this is the wrong target. If it is a photo of a document, crop to the page before you compress.
Will this pass an email attachment limit?
Modern inboxes allow many megabytes. 100 KB is for the form that explicitly says 100 KB, or for a signature image, not for a normal attachment. Use 1 MB or the plain compressor for everyday email.
Is the image uploaded while you search for a quality?
No. Every trial encode happens on your device. Only you download the one that fit.