PNG Resizer
Resize an image to exact pixel dimensions without flattening its transparent background. Pick a preset or type your own size — everything happens in your browser.
Your file never leaves your device. Everything runs in your own browser — there is no upload, no server and nothing stored.
Resize
- Original
- New size
- Scale
Which size do you actually need?
For printing, the number that matters is the pixel count, not the DPI tag. A rough guide for the sizes people ask about most:
- 4500 × 5400 px — a standard DTF or sublimation sheet, 15 × 18 inches at 300 DPI.
- 4096 × 4096 px — what Cutlark bundles ship at; roughly 13.7 inches square at 300 DPI.
- 3000 × 3000 px — comfortable for most print-on-demand square placements.
- 2048 px or less — fine for web, social and mockups, too small for apparel.
If you are unsure, the print size calculator turns any pixel size and DPI into inches and centimetres.
Enlarging versus reducing
Reducing an image is safe — you are discarding information you do not need, and the result stays sharp. Enlarging invents pixels by interpolation, so detail gets softer rather than finer. Nothing can recover detail that was never captured.
The practical rule: buy or start from artwork larger than you need, and scale down. This tool will warn you when you are enlarging past the point where the result stays acceptable.
Keeping the background transparent
Transparency survives a resize only if the output format supports it. This tool always exports PNG for that reason. If you export the same artwork as a JPG anywhere in your workflow, the transparent areas become white and cannot be restored.
To confirm a file still has its alpha channel after any round trip, run it through thetransparency checker.
Common questions
Does resizing lose the transparent background?
Not here. The image is redrawn onto a canvas that keeps its alpha channel and exported as a PNG, so transparency survives. Exporting the same image as a JPG would flatten it, which is why this tool only outputs PNG.
Can I make an image larger than the original?
You can, but no detail is added — the browser interpolates between the pixels that already exist, so the result is softer than the original. Enlarging by up to about 150% is usually acceptable. Beyond that, start from a larger source file.
Why is my exported file bigger than the original?
PNG is lossless, and the browser re-encodes without the optimisation passes a dedicated compressor would apply. A resized file can therefore be larger than a heavily optimised original even at smaller dimensions. The pixel dimensions are what matter for printing.
Does this change the DPI?
No. DPI is a metadata tag that tells a printer how large to render the pixels; it does not change the image. What matters for print quality is the pixel count. Use the print size calculator to see what a given pixel size prints at.
Is my file uploaded?
No. The resize happens on a canvas element in your own browser. The file never leaves your device and the result is downloaded directly from memory.