Ask any group of exam aspirants why their photo upload got rejected, and someone will confidently say it was the DPI. It's one of the most repeated pieces of advice on exam prep forums, and it's usually wrong. Here's what DPI actually controls, and what's really causing most photo and signature rejections on Indian government forms.
Clearing up this one point of confusion can save you a lot of wasted time hunting through obscure editing software settings when the actual fix is much simpler.
What DPI Actually Means (And Why It's Mostly a Print Concept)
DPI stands for dots per inch, and it describes how densely pixels are packed when an image is printed on paper - a higher DPI means more detail per inch of physical print. For a digital upload that will only ever be displayed on a screen and stored as a file, DPI is essentially just a number embedded in the image's metadata; it doesn't change how many pixels the image contains, and it doesn't change the file's KB size. A photo saved at 72 DPI and the same photo saved at 300 DPI, at the same pixel dimensions, are identical for upload purposes - same pixel count, same visible detail, same file size.
This is exactly why the DPI myth persists: DPI sounds technical and image-quality related, so it's an easy scapegoat when an upload fails for a reason that's actually much more mundane, like a file that's simply too many kilobytes.
The Real Reasons Photo Uploads Get Rejected
When a government form rejects your photo, it's almost always one of three real issues: the file size in KB is outside the allowed range (for example, above a 100 KB cap), the pixel dimensions don't match what the portal expects (too small, too large, or the wrong width-to-height ratio), or the file format is wrong (a PNG or WEBP uploaded where only JPEG/JPG is accepted). DPI is essentially never the actual cause, even though it gets blamed constantly. If your upload is failing, check KB size, pixel dimensions, and file format first, in that order.
A less common but still frequent fourth issue is a corrupted or partially uploaded file - if your internet connection drops mid-upload, the portal may show a generic rejection message that looks identical to a specification error, so if everything about your KB size, dimensions, and format checks out, try the upload again on a stable connection before assuming the file itself is the problem.
When DPI Actually Does Matter
DPI becomes genuinely relevant only if you're physically printing a photo - for example, getting extra passport-size prints made at a photo studio, where 300 DPI is the standard for a sharp, professional print. For anything you're uploading to an online form, you can safely ignore DPI settings entirely and focus on getting the pixel dimensions and KB size right instead. SignResizer.com handles the pixel and KB targets automatically, so you never need to worry about DPI settings for an online application.