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Reduce Image Size in KB

Type the size a form asks for, like 50 KB, and get the best-looking file that fits under it.

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or drop files here

Accepts JPG, PNG, WEBP

Encrypted upload. Files are deleted automatically after 1 hour.

About Compress Image to KB

Reduce image size in KB when a website sets a hard limit: an exam registration that wants a photo under 50 KB, a job portal that caps uploads at 100 KB, or a visa form with its own size window. Type the target size and we try quality settings until we find the highest one that still fits, so the photo looks as good as the limit allows.

If even the lowest usable quality is too big, the image is scaled down step by step until it fits. Untick Allow smaller dimensions if needed when the pixel size must stay fixed. Results are saved as JPG by default or as WebP. Transparent areas become white, and photo info is dropped to save space.

How to use Compress Image to KB

  1. 1
    Upload your photo

    Pick one or more JPG, PNG or WebP photos, and each one gets the same target.

  2. 2
    Enter the target size

    Type the limit in Target size, in KB, and pick JPG, WebP or Same format under Save as.

  3. 3
    Compress to KB

    Click Compress Image to KB. We test quality settings until the file lands at or just under your number.

  4. 4
    Download and upload

    The file name ends in the target, such as photo_50kb.jpg, and the result shows the final size.

Why use Cubfile for this

  • Best quality under the limit

    Quality is searched between high and low settings, and the highest one that fits is kept instead of a fixed guess.

  • Shrinks dimensions only if needed

    When quality alone can't get there, the picture is scaled down in steps. Turn this off to keep the exact pixel size.

  • One target for a batch

    Add a set of photos and each one is compressed to the size you entered.

  • Clear message if impossible

    A tiny target for a huge photo may not be reachable while staying readable, and the page says so instead of handing you a blurry mess.

FAQ

Compress Image to KB: questions and answers

Can I compress an image to 20 KB without it looking blurry?
It depends on the photo's size and detail. The tool keeps the highest quality that fits and only reduces the dimensions when quality alone isn't enough, so small targets usually mean a smaller picture rather than a smeared one.
Why can't I compress my photo to 5 KB?
With a large, detailed photo, 5 KB may be too small even after resizing. Crop the photo to just the part you need first, make sure smaller dimensions are allowed, and try again. You can do the cropping with Crop Image, freely or at a fixed ratio.
Can I keep a PNG as a PNG when I reduce its size in KB?
No. PNG has no quality setting, so it can't be tuned to a size. With Same format, WebP stays WebP and everything else is saved as JPG, with transparent parts filled in white. To shrink a PNG and keep it a PNG, use Compress Image, which reduces its colors instead.
Is it free to compress images to KB?
Yes. Visitors get 2 tasks in total and free accounts 2 a day, with files up to 50 MB. VIP has no daily limit and can handle up to 50 photos per task.
Do you keep the ID photos I upload?
No. They're sent over HTTPS, processed in an isolated process and deleted after one hour. You can also delete them straight away from the result screen.
Share Compress Image to KB with a friendIt runs in any browser, and they can try it without signing up.

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