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Photo Resizer — exact size in cm, pixels & KB

Crop, resize and compress a photo to the exact dimensions and file size an application form asks for. Pick a preset or type your own size.

No upload — stays on your device Instant Free · no sign-up · no watermark

1Choose your image

Tap to choose an image or drag & drop · JPG, PNG, WEBP, HEIC* · stays on your device

Quick answer: To resize a photo to 3.5×4.5 cm between 20–50 KB: choose the photo, select the “Passport 3.5×4.5 cm” preset, drag to centre your face, then tap Process and Download. The tool sets 300 DPI and adjusts JPEG quality until the file is inside the KB range.

How to use the Photo Resizer (KB & cm)

  1. Tap “Choose an image” and pick your photo (camera or gallery).
  2. Pick a preset or enter width, height, unit and DPI. Set the min/max KB the form allows.
  3. Drag the photo to centre your face and use Zoom to fit the frame.
  4. Tap “Resize photo”, check the size shown, then Download.

Frequently asked questions

What is passport size in pixels?

3.5 × 4.5 cm at 300 DPI is 413 × 531 pixels. At 200 DPI it is 276 × 354 pixels. Choose “cm” as the unit and the tool converts it for you.

How do I make a photo exactly 20 KB?

Set Max size to 20 KB (and Min size to, say, 15 KB). The tool finds the highest quality that fits. If the dimensions are too large to fit, reduce width/height.

Are my files uploaded to a server?

No. Everything happens inside your browser using your own device. Files are never uploaded, stored or seen by anyone — you can even switch off the internet after the page loads and the tool keeps working.

Is it free? Is there a watermark or limit?

It is completely free with no sign-up, no watermark and no daily limit.

Does it work on mobile?

Yes — it is built for phones first and works in Chrome, Safari, Firefox and Samsung Internet on Android and iPhone.