DPI Converter – Set Image DPI for Print
Prepare a photo at 100, 150, 200 or 300 DPI for exam forms and printing, in your browser. No upload, free.
Open Image Tool🔒 The tool for this page — pick a file and download
DPI converter — what it does
DPI (dots per inch) links an image's pixels to its printed size. On the Resize tab you set a target DPI and a size in cm or mm, and the tool works out the pixel dimensions your photo needs — the right way to prepare an image for print or a form that specifies DPI. Everything runs in your browser.
Step by step
- Add your photo (JPG, JPEG or PNG).
- Open the Resize tab and choose cm or mm as the unit.
- Enter your target DPI (100, 150, 200 or 300) and the print size you need.
- Apply and download the correctly sized image.
DPI converter — details
| Setting | Options | Notes |
|---|---|---|
| Target DPI | 100 / 150 / 200 / 300 | Higher DPI = sharper print |
| Unit | cm, mm or px | cm/mm use the DPI value |
| Privacy | client-side | Nothing uploaded |
Frequently Asked Questions
How does the DPI converter work?
You pick a DPI and a print size in cm or mm on the Resize tab, and the tool calculates the exact pixel dimensions and resizes your image to match.
What DPI should I use?
150 DPI is fine for most screens and forms, while 300 DPI is the standard for good-quality printing such as photos and certificates.
Does changing DPI change how the image looks on screen?
On screen images are shown by pixels, so DPI mainly affects printed size. This tool resizes the pixels to give you the right print dimensions at your chosen DPI.
Is it free and private?
Yes — it runs in your browser with no upload, no signup and no watermark.
Related tools
Format converters & guides
You may also need Compress Image to KB, Photo Resizer, Image Converter.
More about DPI and print size
DPI, or dots per inch, describes how many pixels are packed into each inch when an image is printed. A photo that looks fine on screen can print blurry if its DPI is too low for the size, which is why forms and print shops often specify a DPI such as 300.
The practical way to handle DPI is to decide the printed size you need — say 4.5 x 3.5 cm for a passport photo — and the DPI you want, then let the tool compute the pixel dimensions. ExamFo's Resize tab does exactly this: choose cm or mm, enter the DPI, and it resizes the image accordingly.
Because everything happens in your browser, your photo is never uploaded and the tool works on a phone. For simple centimetre resizing see Photo Resize in cm, and to hit an exact file size afterwards use Compress Image to KB.