Increase PNG File Resolution Free
This tool increases a PNG file’s resolution by redrawing it at a larger pixel size, then trims it to the exact file size you want. Choose "increase resolution" below, set a target size, and download — all of it happens in your browser, with no upload.
Increase PNG file size
Runs entirely in this browser tab. Your file is never uploaded.
Drag a PNG file here, or
Nothing is uploaded when you pick a file.
How it works
- 1
Choose your PNG file
Drag a file onto the tool above or click to browse. It accepts .png 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
Plenty of upload forms set a minimum file size as well as a maximum, and reject anything under it. Government portals, visa and examination sites are the usual culprits. A perfectly clear scan that happens to compress well fails the check with no explanation of what is wrong.
The minimum exists to screen out unreadable scans, but it cannot tell an unreadable file from an efficiently compressed one. Padding the file to the size the form wants gets you past the validator without touching a single pixel of the image.
Why PNG files behave differently
PNG is lossless, so it never throws detail away, but it is built for flat colour: screenshots, logos, diagrams and line art. A signature or a simple graphic can compress to a few kilobytes because a PNG can describe long runs of identical pixels almost for free. Photographs go the other way and stay large.
Padding a PNG adds ancillary tEXt chunks before the file’s IEND marker. Ancillary chunks are the part of the specification that says decoders may ignore what they do not recognise, so the IDAT pixel data is untouched and the image is identical.
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?
This page is set up for PNG images. The tool also handles PDFs and the other image format — drop any supported file in and it will detect the type from the file itself rather than the extension.
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.