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Change image DPI

Set a photo or scan to 300 DPI, 200 DPI or any value a form asks for, without changing a single pixel, or resize it to print at an exact size in centimetres or inches.

The DPI forms ask for, without losing quality

No quality lost

For JPG and PNG, only the DPI written inside the file changes. The picture itself isn’t re-saved, so it stays exactly as sharp.

Exact print sizes

Need 3.5 × 4.5 cm at 300 DPI? Enter the size and it works out the pixels (413 × 531) and sets the DPI to match.

Stays on your device

Up to 20 images at once, changed in your browser. Your photos and documents are never uploaded.

How to change the DPI of an image

  1. Choose your images

    JPG, PNG, HEIC, WebP and more. You’ll see the DPI each one has now.

  2. Pick the DPI

    300 and 200 are the usual answers for forms and printing; type any other value.

  3. Optional: set a print size

    Enter the width or height in cm, mm or inches to resize to it.

  4. Download

    Save each image, or all of them in one ZIP.

Questions

What is DPI in an image?

DPI (dots per inch) is a number stored in the file that tells printers how many pixels to fit into each inch. A 1200 × 1800 pixel photo at 300 DPI prints at 4 × 6 inches; at 150 DPI the same pixels print twice as large.

Does changing DPI improve quality?

No. Changing DPI only changes the printed size; the pixels, and so the sharpness, stay the same. To print sharp at a given size you need enough pixels: about 1200 × 1800 for a 4 × 6 inch photo at 300 DPI.

How do I make a photo 300 DPI for an exam form?

Choose the photo, keep ‘Change DPI only’ and pick 300. If the form also gives a size in cm, use ‘Set a print size’ and enter it. Then check the KB limit with Compress image.

Why does my image show 72 or 96 DPI?

Phones and screenshots often store 72 DPI, or nothing at all, which Windows shows as 96. The camera’s pixels are fine; only the label is low. Setting it to 300 fixes what forms and print shops see.

How many pixels is 3.5 × 4.5 cm at 300 DPI?

413 × 531 pixels. Each centimetre at 300 DPI is about 118 pixels (300 ÷ 2.54). At 200 DPI the same size is 276 × 354 pixels.

Which formats keep the DPI?

JPG and PNG store DPI and are changed in place. Other formats such as HEIC or WebP are saved as JPG (or PNG if they have transparency) with the new DPI.