Change Image DPI
Set a JPG's DPI tag for NSDL PAN (200) or printing (300) without re-compressing the pixels.
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Drop your JPG here
Sets the DPI tag without re-compressing — the pixels stay identical
My form says “DPI should be 200”
That message means the form reads the DPI number saved inside your JPG. Get the file to the form's pixel size and KB limit first, then open it here, choose 200 and download. Upload that file: the photo is unchanged and its KB size barely moves, so it still fits the limit.
DPI is a label; pixels are the photograph
DPI is a number saved in the file that says how large the image should print. Changing it alone does not add detail, sharpen anything, or make a small photo acceptable — a 300 by 300 pixel image tagged at 300 DPI simply says print me one inch wide. When a form asks for 300 DPI alongside a print size, what it needs in practice is enough pixels to print at that size. Some portals do read the DPI field itself, so check whether yours states a pixel requirement as well.
The relationship is arithmetic: millimetres divided by 25.4, multiplied by DPI, gives pixels. A 35 by 45mm photo at 300 DPI is about 413 by 531 pixels. If your source is smaller than that, raising the DPI tag will satisfy a checker that only reads metadata but will still print soft, because the detail was never captured. Re-tagging is useful when a portal validates the DPI field; it is not a substitute for photographing at a higher resolution.
- Work out the pixels your print size needs before changing the tag.
- Do not upscale a small image to reach a pixel count — retake it.
- Keep the original file in case the portal wants the untouched capture.
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Frequently asked questions
Does changing the DPI affect image quality?
No. DPI (dots per inch) is a label saved in the file that tells a printer or a portal how large to show the image. This tool rewrites only that label; the pixels are left exactly as they were, so nothing is lost and the file size barely changes.
Why does the NSDL (Protean) PAN form ask for 200 DPI?
The NSDL (now Protean) PAN application portal checks the declared DPI in the scanned photo and signature. If the scan was saved at 72 DPI (the browser/phone default), the portal can reject it even when the pixel dimensions are correct. Setting the tag to 200 DPI satisfies that check without re-scanning.
What DPI should I use for printing a passport photo?
300 DPI is the print-shop standard for photo prints. At 300 DPI a 35×45 mm passport photo needs roughly 413×531 pixels. For document scans some portals ask for 200 or 600 DPI — use the custom field if your form specifies a different value.
Does it work on PNG files?
No. This tool edits the DPI label in JPG files. PNG files store it differently, and most portals that check DPI ask for a JPG anyway. Convert a PNG to JPG with the format converter first, then set its DPI here.