Resize Image to Exact KB
Choose a target size, add your photo and CometBits shrinks it to fit. It tries the highest quality that stays under your limit, so the picture stays as sharp as possible. Everything happens inside your browser, so your photo is never uploaded.
Runs in your browser. Your files never leave your device.
- 1Add file
- 2Adjust
- 3Download
No file handy?
How it works
- 01Add your image, or drag it onto the box.
- 02Pick a target size such as 20 KB, 50 KB or 100 KB, or type your own.
- 03Press Resize, check the preview, then download your image.
Tips and common mistakes
KB and pixels are two different limits
Many forms ask for both a pixel size (for example 200 x 230) and a file size (for example under 50 KB). Resize to the pixel size first, then reduce the file size to the KB limit. A smaller picture is already a smaller file, which means it needs less quality loss to fit.
Use JPG for photos
JPG gives much smaller files than PNG for photographs. Most exam and application forms ask for JPG or JPEG. Do not rename a PNG to .jpg, because some portals check the real file type and reject it.
Avoid a result that is too small or too soft
Some portals also set a minimum size, such as 20 KB. If your photo comes out blurry, choose the upper end of the allowed range instead of the lowest one, and keep the face clear and centred.
Guides for this tool
- How to Reduce Photo Size in KB on iPhone, Windows and MacGet a photo under 20 KB, 50 KB or 100 KB on an iPhone, a Windows laptop or a Mac. What the built-in apps can and cannot do, and the fastest exact way.2 min
- How to Reduce Photo Size in KB on Your Phone (Android and iPhone)Reduce a photo to 20 KB, 50 KB, 100 KB or 200 KB right on your phone, with no app to install. Step-by-step for Android and iPhone, free and private.2 min
- How to Reduce an Image to 20 KB for Online FormsA simple, step-by-step way to get a photo or signature under 20 KB for exam and job application forms, without it turning blurry.2 min
Questions
Is the result exactly the size I pick?
The result is at or just under your target. It is rarely exactly equal, because image sizes depend on the picture, but it lands close to the limit so you keep the best quality.
Is my photo uploaded anywhere?
No. The image is processed on your own device by your browser. Nothing is sent to a server, which also makes it work well for ID photos and signatures.
What if the image is already smaller than my target?
We tell you. The tool never makes a picture bigger on purpose, so you can use the original file if it already fits.
Which formats can I use?
You can add JPG, PNG, WebP, GIF or BMP files. The result is saved as a JPEG by default, which gives the smallest files for photos, or as WebP if you choose it.