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Change the DPI of an image.

Application forms and print shops often ask for a photo “at 300 DPI”. Pick the value you need and download the same image with its resolution updated — nothing is re-compressed.

  • The DPI is written on your device — the photo is never uploaded
  • Lossless: only the resolution tag changes, not a single pixel
  • Shows the print size in cm, so you can check a form’s rules

How it works.

  1. 1Drop your JPG or PNG photos into the box above.
  2. 2Pick the DPI you need — 300 is the usual print and form requirement — or choose Other to type your own.
  3. 3Tap Change DPI. The new value is written on your device; nothing is uploaded.
  4. 4Download the images. The result card shows the size each one will print at.

Frequently asked questions

What does DPI actually change?

Only a number stored in the file that tells a printer how many pixels to fit into each inch. The picture itself — its pixels, quality and file size — stays the same. A 1200 × 1500 photo at 300 DPI prints at 10.2 × 12.7 cm; at 150 DPI the same pixels print twice as large.

My form wants 300 DPI and 3.5 × 4.5 cm. What do I do?

At 300 DPI, 3.5 × 4.5 cm is 413 × 531 pixels. Get the photo to those pixel dimensions first with the passport preset in the resize tool, then set 300 DPI here. The result card confirms the print size in centimetres.

Does a higher DPI make my photo sharper?

No. Sharpness comes from the number of pixels. Raising the DPI of a small image makes it print smaller, not clearer — to print large and sharp you need a photo with more pixels to begin with.

Why does the file size barely change?

Because nothing is re-compressed. The tool edits a few bytes of the file’s header — the JFIF and EXIF resolution fields in a JPG, the pHYs chunk in a PNG — and leaves the image data exactly as it was.

Can I change the DPI of a WebP or HEIC photo?

Not directly — neither format has a dependable place to store it, and most forms want JPG anyway. Convert the photo to JPG first, then set the DPI here.