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Reduce Image Size

Smaller file or smaller picture? Drop your image, see both numbers, pick one.

Drop your image here

  • Files never leave your device
  • Unlimited · No signup

Reduce an image in 3 steps

  1. Drop your JPG, PNG or WebP image. We show its file size (KB) and dimensions (pixels).
  2. Choose "Shrink the file size (KB)" or "Shrink the dimensions (pixels)".
  3. Set your target, press "Reduce" and download.

Why ConvertKoala?

  • No more guessing

    "Smaller" can mean two things. We show you both numbers so you know exactly what you are changing.

  • Stays on your device

    The image is processed in your browser. It is never uploaded, so private photos stay private.

  • Free, no account

    No caps, no signup, no watermark. Reduce as many images as you like.

  • Phone-friendly

    Works in any modern browser on iPhone, Android or a computer. Nothing to install.

Frequently asked questions

Should I shrink the file size or the dimensions?

If a website or form says something like "max 100 KB" or "under 2 MB", shrink the file size. If it asks for a width and height in pixels, or the picture simply looks too big on screen, shrink the dimensions.

What is the difference between KB and pixels?

KB (or MB) is how much storage the file takes. Pixels are the width and height of the picture. A 4000 × 3000 photo can be 3 MB; you can make the file 100 KB and keep it 4000 × 3000, or make it 800 × 600 pixels instead.

Will reducing the image lower the quality?

Usually a little. Shrinking the file size removes fine detail, and fewer pixels means less detail on a big screen. We aim for the best result that meets your target, so at sensible sizes the change is hard to notice.

Which formats are supported?

JPG, PNG and WebP. When you shrink the file size, the result is saved as JPG. When you shrink the dimensions, the original format is kept. iPhone’s HEIC format is not supported yet.

Can I do this on my phone?

Yes. Open this page in your phone’s browser, tap "Choose files" and pick a photo. The two numbers and the two options appear just like on a computer, and the result saves to your phone.

Is my image uploaded?

No. Everything happens inside your browser on your own device. Your image never reaches our servers, and nothing is kept once you close the page.

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