Increase an Image’s Size in Pixels Free
This free tool increases an image’s pixel dimensions by redrawing it at a larger size, then sets the file to the exact size you need. Pixels and file size are different things, and the "increase resolution" mode below changes both at once — in your browser, with no upload.
Increase JPG, PNG or PDF file size
Runs entirely in this browser tab. Your file is never uploaded.
Drag a JPG, PNG or PDF file here, or
Nothing is uploaded when you pick a file.
How it works
- 1
Choose your file
Drag a file onto the tool above or click to browse. It accepts JPG, PNG and PDF files, and the file is read directly by your browser rather than sent anywhere.
- 2
Set your target size
Pick a preset from the dropdown or type an exact figure in KB or MB. The output will match that number byte for byte.
- 3
Pick padding or a real resolution increase
This page defaults to "increase resolution", which redraws the image at a larger pixel size. Switch to "pad file size" if you only need the byte count to change and want the pixels left exactly as they are.
- 4
Download the result
Press the button and your browser saves the new file at exactly the size you asked for. Nothing was uploaded, so there is nothing stored anywhere for you to delete afterwards.
Why you might need this
Size floors turn up in the places with the most paperwork and the least flexibility. Immigration services, examination boards, professional registration bodies and bank onboarding forms all use them, and none of them will explain which end of the range you failed.
Because efficient compression is what causes the problem, the answer is not to make a worse image. Adding padding leaves the pixels exactly as they are, which is what the validator wanted all along.
Frequently asked questions
Will this reduce my image’s quality?
No. In "increase resolution" mode the image is redrawn at a larger pixel size, so it gains pixels rather than losing them — though enlarging cannot recover detail an earlier compression already discarded. In the default padding mode nothing about the image is altered at all.
Is my file uploaded to a server?
Never. This site has no route that accepts a visitor file at all. Everything happens inside the browser tab you are reading this in, which is why it costs nothing to run and why a passport scan or bank statement is as safe here as it is in your own file manager.
What file formats are supported?
JPG (including .jpeg), PNG and PDF. Each one is padded using the structure its own specification reserves for data readers can ignore, so the output is always a valid file of that type.
Why would I need to increase file size instead of decrease it?
Minimum size rules exist because file size is the cheapest available proxy for "is this scan readable". A form cannot easily judge legibility, so it judges bytes. Modern compression is good enough that a perfectly clear document lands under the threshold, and then the only thing wrong with it is the number.
Is this free to use?
Yes — free, with no account, no watermark, no email address and no limit on how many files you run through it. Because the work happens on your own device rather than on a server, there are no processing costs to pass on.