Change image DPI to 200 or 300 when an exam form or print shop checks it. DPI is just a setting stored in the file, so this tool rewrites it without touching the picture: same pixels, same quality and almost the same file size. If the form also has a size limit, resize image to 50KB or use the exam photo resizer next.
How to change image DPI
- Choose your JPG or PNG images.
- Tap a DPI value (72, 96, 150, 200, 300 or 600) or type your own, for example 300 for a 300 DPI image.
- Optionally tick “Remove hidden photo data” to drop the GPS location and camera details.
- Tap “Set … DPI”. Each result shows the old and new DPI. Then download.
What changes and what does not
| DPI / resolution | Changed to your value, in both the JFIF and EXIF fields |
|---|---|
| Pixels (width × height) | Unchanged |
| JPG quality | Unchanged: the image data is not re-compressed |
| File size | Unchanged or a few bytes different |
Frequently asked questions
Does increasing DPI make my photo sharper?
No. DPI only tells printers how many pixels to fit into each inch. A 600 × 600 pixel photo at 300 DPI prints at 2 × 2 inches. At 72 DPI the same photo prints at about 8 × 8 inches, with the same detail. To add pixels, use Resize Image.
The form says “300 DPI”. Is this enough?
If the form only checks the DPI value, yes. If it also asks for a size in cm, the pixels must match too. For example, 3.5 × 4.5 cm at 300 DPI needs 413 × 531 pixels. Use Resize Image with the cm unit to set both in one step.
Why does Windows still show the old DPI?
Windows reads the resolution from the photo's EXIF data when it exists. We update that as well as the JFIF header, so Windows, Photoshop and online checkers all see the new value. If Explorer still shows the old number, it is showing a cached value, so close and reopen the folder.
Is my photo re-compressed?
JPGs are not: only a few header bytes change, so there is zero quality loss. PNGs are re-saved losslessly, which is also zero loss, so that the file ends up with one clean DPI setting.
What does “Remove hidden photo data” do?
It deletes the EXIF information your camera added, such as the GPS location, date and time, and phone model. The picture is not changed. It is a good idea when uploading photos to public websites.
Step-by-step guide: How to Resize Photo for Exam Form Uploads
Related tools
- Resize ImageChange image width and height in pixels, cm, mm or inches.
- Resize Image to 20KBMake any photo under 20KB, e.g. 10–20KB for exam forms.
- Compress ImageReduce JPG, PNG or WebP file size without visible quality loss.
- Crop ImageCrop photos freely or to a fixed shape like square or passport.
- Increase Image Size in KBMake a photo bigger in KB (e.g. 20KB → 50KB) when a form sets a minimum.