Reduce image size in KB
Make a large photo smaller in KB without making it look bad. Pick a size, or type your own.
- Free, no sign-up
- Files never uploaded
- No watermark
- No limits
Your photo is processed in your browser and is never uploaded.
How to reduce image size
- Tap a size, or type the size you need in the Target size box.
- Tap Choose a photo and pick the image.
- Tap Download JPG. The file is just under the size you chose.
Why phone photos are so big
Modern phone cameras take 12 to 50 megapixel photos, which are usually 2 to 8 MB each. That's far more detail than a website, form or email needs. Reducing the size keeps the photo looking the same on screen while making the file many times smaller.
From MB to KB in one step
DocSlim keeps the highest JPEG quality that fits your size and shrinks the pixel dimensions only when it has to. A 5 MB photo can become 100 KB and still look sharp on a phone or laptop screen.
Common sizes
- 20 to 50 KB for form photos and signatures
- 100 to 200 KB for profile pictures and scanned documents
- 500 KB for documents and photos you want to email or upload quickly
Frequently asked questions
How do I reduce a photo from MB to KB?
Pick a size above, like 100 KB, choose your photo and download the result. The photo is reduced in a few seconds.
Does reducing the size change the dimensions?
Only if needed. DocSlim lowers the JPEG quality first, then the pixel dimensions. To keep exact dimensions, enter a width and height.
Is my photo uploaded to a server?
No. The compression runs inside your browser on your own device. Your photo is never uploaded, stored or seen by anyone.
Is this tool free?
Yes. It's completely free, with no sign-up, no watermark and no limit on how many images you compress.
Why is the result a little under the limit instead of exactly the limit?
Forms reject files that are even one byte over. DocSlim counts 1 KB as 1,000 bytes and aims just below your limit, so the file passes whether the website counts 1 KB as 1,000 or 1,024 bytes.