Image DPI Checker & Changer
Check or set the DPI of JPG and PNG files, pixels untouched, on your device.
Try before you buy.
- Free preview: each image’s new DPI and print size, with its picture at preview size (up to 640 pixels) and a MySmartCoPilot watermark; in a batch, the first images (up to 3).
- Locked until you unlock it: download.
- Unlock: Pro pass, ₹179 for 30 days, a one-time payment that never renews.
Ways to unlock shows how to get the full result.
Printing this result is locked in the free preview.
New DPI
Only the resolution stored in the file changes: the pixels, and so the picture and its quality, stay exactly the same. To print at a size with new pixels, use the Image Resizer (cm, mm or inches at any DPI).
Your images
Pixels for a print size
Locked in the free preview. Opens the ways to unlock this result.
Locked in the free preview. Batch runs unlock with a pass.
Locked in the free preview. Query results unlock with a pass.
About the Image DPI Checker & Changer
A JPG or PNG can store a print resolution — its DPI — next to its pixels. Printers and some upload forms read it; screens ignore it. Add your images to see the DPI each one stores and the size it prints at, then pick 72, 96, 150, 200, 300 or 600 DPI (or any other): the files with the new value download with a pass.
Only that value changes: the pixels stay exactly as they are, so the picture and its quality are untouched and nothing is saved again. A JPG gets the new DPI in its JFIF header and, where the photo has them, in its EXIF resolution tags too, so apps that read either agree; a PNG gets it in its pHYs chunk. Everything happens in your browser. Without a pass, the free preview shows each image’s new DPI and print size, read back from the changed file, with its picture at preview size and a MySmartCoPilot watermark; in a batch, only the first images are changed.
How to use it
- Add JPG or PNG images: drop them on the box, choose them or paste one. Each shows its pixels, the DPI it stores now and its print size.
- Choose the new DPI, or Other to type one.
- Check the new print size of each image, then download it — with a pass, or after unlocking this result — or Download all (ZIP) with a pass.
Examples
240 × 240 px JPG · 72 DPI · set 200 DPI
240 × 240 px at 200 DPI: it prints at 3.05 × 3.05 cm, as IBPS and SBI prefer (240 × 240 pixels in 200 DPI, 3 × 3 cm).
1200 × 1800 px · set 300 DPI
10.16 × 15.24 cm (4 × 6 in): the same pixels, now printed at a 4 × 6 inch size.
DPI, pixels and print size
Print size = pixels ÷ DPI. A 1200 px wide image is 4 inches (10.16 cm) wide at 300 DPI and 16.67 inches at 72 DPI: the picture is the same, only the size a printer makes it changes. Raising the DPI does not add detail; to print large and sharp, the image needs more pixels.
Need a print size with new pixels instead — say a 3.5 × 4.5 cm photo at 300 DPI? Use Pixels for a print size below, then the Image Resizer, which resizes in cm, mm or inches at any DPI and writes that DPI into the file.
Forms that state a DPI
- IBPS and SBI: the left thumb impression at 240 × 240 pixels in 200 DPI and the handwritten declaration at 800 × 400 pixels in 200 DPI (IBPS notification).
- PAN (Protean), online application with scanned images: the photo, the signature and the supporting documents scanned at 200 DPI (Protean scanning specifications).
The Photo & Signature Resizer makes these files with their pixels, KB range and DPI in one step.
Where the DPI is stored
- JPG: the JFIF header (ITU-T T.871) and the EXIF XResolution, YResolution and ResolutionUnit tags (CIPA DC-008). The tool writes both; EXIF tags are changed where the photo already has them, in place.
- PNG: the pHYs chunk, in pixels per metre (300 DPI is stored as 11,811 pixels per metre).
- WebP, HEIC and others have no standard place for a DPI value: convert them to JPG or PNG first with the Image Converter.
How this compares
- Runs on your device: your images are never uploaded.
- The picture is untouched: the pixels are copied byte for byte; only the DPI value changes.
- You don’t need an account: no sign-up, no email address and nothing to install.
Limitations
- JPG and PNG only. Up to 100 images at a time.
- Changing the DPI never changes the pixels: a form that checks the pixel size needs the right size first (Image Resizer).
- A JPG that stores no EXIF resolution gets the new DPI in its JFIF header only, which is where apps look when there is no EXIF value.
Privacy
Your images are processed in your browser and never uploaded. Only the DPI you chose is remembered on this device.
Frequently asked questions
What do I get without a pass?
Without a pass, Image DPI Checker & Changer shows each image’s new DPI and print size, with its picture at preview size (up to 640 pixels) and a MySmartCoPilot watermark; in a batch, the first images (up to 3). Until you unlock it, the result can’t be downloaded. A Pro, Premium or Ultimate pass, a one-time payment that never renews, unlocks the full result. The pricing page lists the passes and their prices.
How do I change the DPI of an image to 300?
Add the image and keep 300 selected. The file you download with a pass keeps every pixel; its JFIF header (and its EXIF resolution, if it has one) now says 300 DPI, so it prints at pixels ÷ 300 inches.
Does changing DPI reduce quality?
No. The DPI is a number stored next to the pixels, and the pixels are not changed or saved again. Only the size a printer makes the picture changes.
How do I check the DPI of an image?
Add it: the list shows the DPI it stores (and where: JFIF, EXIF or pHYs) and the size it prints at. If it stores none, most apps assume 72 or 96 DPI.
Are my images uploaded?
No. Everything happens in your browser, and the page keeps working offline once it has loaded.