Enlarge images 2×, 3× or 4× with Lanczos resampling, which keeps edges far crisper than an ordinary browser resize. Everything runs in your browser — no upload, no account, no limit on how many images you run.
Drop an image to upscaleor click to browse · JPG, PNG, WebP, AVIF
Pick how much larger you want the result. Bigger factors take slightly longer and produce much bigger files.
PNG is lossless. JPG and WebP give much smaller files.
Only applies to JPG and WebP output.
92%
—→—
Original
Upscaled
Both previews are shown at the same width so you can compare detail directly — the upscaled file is larger than it looks here. Download it to see the real resolution.
Freeno limits, no watermark
4×up to quadruple resolution
100%private — runs in browser
What upscaling can and cannot do
Enlarging an image means inventing pixels that were never captured, and every method is a different way of guessing. The browser default averages neighbours crudely, which is why enlarged photos go soft. Lanczos weighs a wider neighbourhood with a windowed sinc curve, so edges stay defined and gradients stay smooth instead of turning blocky or blurry.
What it cannot do is add detail that was never in the file. Nothing here is invented from a trained model; if a face is four pixels wide, no amount of resampling will tell you whose it is. The arithmetic runs in your own browser, which is why there is no daily quota — the work happens on your machine, not on a server we have to pay for.
Getting the best result
Start from the largest original you have. Upscaling an image that was already enlarged once compounds the artefacts.
It works on anything — photos, logos, screenshots, line art — because it makes no assumption about what the picture contains.
Modest factors usually look best. 2× from a decent original beats 4× from a small one, because neither can add information that was not captured.
Export to PNG if the result is going into further editing, and to WebP or JPG if it is going straight onto a web page.
Frequently Asked Questions
Is the image really not uploaded anywhere?▸
Correct. The resampling is plain arithmetic running in your browser, and there is no upload code at all. You can confirm it by opening your browser devtools Network tab while you use the tool — no request carries your file.
Why is there no AI option?▸
There used to be one. It was removed because the openly published super-resolution models are trained on image sets whose terms are written for academic research, and this site carries ads. Rather than rely on an argument about whether that reaches us, the tool now does something it can stand behind completely. It is also instant, needs no model download, and works the same on every device.
How large an image can I upscale?▸
There is no hard cap, but the result has to fit in a canvas your browser can hold — roughly 16384 px on a side. If your chosen factor would exceed that the tool says so before starting, so pick a smaller one.
What is the difference between 2×, 3× and 4×?▸
Only how much bigger the output is. Each is computed directly from your original at that exact factor, so nothing is resized twice and no quality is lost to an intermediate step.
Can it recover detail that is not in the photo?▸
No, and be wary of anything that claims it can. Resampling can only redistribute the information already in the file. Tools that appear to add detail are producing a plausible invention, which may look convincing but is not evidence of what was actually there — never rely on an upscaled image for forensic or legal purposes.