DPI Converter: Change Image DPI Online
Use this DPI converter to check and change the DPI of a JPG or PNG, for example to 200 or 300 DPI for a form or print shop. The DPI-only mode changes the value stored in the file without touching the pixels. For KB limits too, use resize image in KB.
Why use our DPI Converter tool?
- PAN and exam forms specify 200 DPI
- Print shops ask for 300 DPI
- Phones save photos at 72 DPI or none
- Exact cm sizes need the right DPI
- Lossless DPI change keeps quality
How to change DPI of an image
- Tap Choose image (JPG or PNG).
- Check the current pixels, DPI and print size.
- Pick the new DPI.
- Choose DPI-only, or resize to a print size in cm.
- Tap Set DPI and download.
Where people use it
- 🆔 PAN photo and signature at 200 DPI
- 🎓 Exam forms with DPI rules
- 🖨️ Print shops that need 300 DPI
- 📰 Images for print publications
- 🪧 Posters and flyers
- 📐 Photos at an exact size in cm
What DPI actually means
A digital photo has a fixed number of pixels. DPI (dots per inch) is a number stored in the file that tells printers how many of those pixels to place in each inch. Changing 72 DPI to 300 DPI without resizing does not change how the photo looks on screen; it only makes the printed size smaller and sharper.
Example: a 600 × 600 px photo prints 5.08 cm wide at 300 DPI, or 21.2 cm wide at 72 DPI.
When forms ask for 200 or 300 DPI
PAN, exam and some visa forms specify both a size in cm and a DPI. Use "Resize to a print size at this DPI", type the cm values from the form, and the photo is scaled to the matching pixels with the DPI set. For example 3.5 × 4.5 cm at 200 DPI gives 276 × 354 px. To also meet a KB limit, use resize image in KB, which can set DPI too.
Check the DPI of any image
Choose a JPG or PNG and, before you change anything, the tool shows its pixel size, the DPI written in the file and the size it will print at. That makes it a quick DPI checker: if a form says "200 DPI" and your file already says 200, you are done. Files with no DPI written in them show as 72, the usual default.
How big can you print it at 300 DPI?
| Pixels (long side) | Max print at 300 DPI | Good for |
|---|---|---|
| 531 px | 4.5 cm | Passport photo |
| 1800 px | 15.2 cm (6 in) | 4×6 print |
| 2480 × 3508 px | A4 page | Documents, posters |
| 4000 px | 33.9 cm | Large prints |
Raising the DPI number never adds detail; if your photo has too few pixels for the print size, it will look soft no matter what DPI it says.
DPI Converter: this tool vs typical online tools
What changes when the work happens on your own device
| Feature | ✅ jpgtopdf | Typical online tool |
|---|---|---|
| 🔎 Current DPI | ✅ Shown with print size | ❌ Not shown |
| 🖼️ Lossless | ✅ DPI-only mode | ❌ Always re-encoded |
| 📐 cm sizes | ✅ Resize to cm at DPI | ❌ Pixels only |
| 🔒 Privacy | ✅ Stays on your device | ❌ Often uploaded to a server |
| 💧 Watermark | ✅ Never | ❌ Sometimes on free plans |
| 💰 Cost | ✅ 100% free | ❌ Free with limits or paid |
🏆 Perfect for DPI requirementsThe right DPI, without losing quality.
DPI Converter FAQs
Does changing DPI reduce quality?
Not in "Change DPI only" mode: the image data is copied as is and only the DPI value changes.
How do I convert a photo to 300 DPI?
Choose the photo, select 300 and press Set DPI. If the form also gives a size in cm, use the print-size mode.
How can I check the DPI of an image?
Choose the file; the tool shows its pixel size, the DPI stored in it and the size it will print at.
Why does my photo show 72 DPI?
Many phones and apps do not write a DPI value, and 72 is the common default when none is set.
How do I check the DPI of an image?
Choose the image here; its current DPI, pixel size and print size appear straight away, before you change anything.
Does changing DPI improve quality?
No. Changing only the DPI keeps every pixel the same; it changes how large the image prints, not how sharp it is.
How do I make a photo 300 DPI?
Choose the photo, pick 300 and press Set DPI. For an exact print size, choose "Resize to a print size" and type the centimetres.
How big can I print my photo?
Divide the pixel width by 300 to get the width in inches at good print quality (multiply by 2.54 for centimetres).