Image Upscaler — 2× and 4×, Free
Enlarge a photo to twice or four times its size without the mushy, over-smoothed look. Lanczos-3 resampling plus edge-aware sharpening, processed on your device in about a second.
Drop photos here, paste with Ctrl+V, or browse
JPEG, PNG or WebP up to 60 MB · select several for a batch · processed on this device, nothing uploaded
Fine-tune
How it works
Drop a photo
JPEG, PNG or WebP. It is decoded right here in the tab; nothing is sent anywhere.
Pick 2× or 4×
The output size is shown before you download. Switch factors and it re-runs instantly.
Compare and download
Drag the slider, zoom to 100% to see real pixels, then save as PNG (lossless), JPG or WebP.
How this upscaler works
Most "upscale" buttons just stretch the image with bilinear interpolation, which is why the result looks soft. This tool resamples with a Lanczos-3 kernel — the same windowed-sinc filter used by professional tools — so edges stay crisp and fine texture is preserved rather than smeared. A light unsharp mask runs before resampling to protect existing detail, and a thresholded 3×3 sharpen runs after, so flat areas such as sky or skin do not gain noise.
Because the result is computed from your actual pixels, nothing is invented. That matters for product photos, documents, screenshots and anything where a hallucinated detail would be wrong. If you want a generative redraw instead, the photo quality enhancer has AI levels that use your own Gemini key.
When to use 2× vs 4×
Use 2× for photos that are already reasonably sharp and only need to meet a size requirement — a 1000 px marketplace minimum, a print at a larger size, a retina display. Use 4× for small sources such as thumbnails, old phone photos or web images; expect the result to look clean but not to gain detail the original never had. If the original is blurry, run it through the unblur tool first and upscale the result.
Frequently asked questions
Is this an AI image upscaler?
No neural network runs here. It is a Lanczos-3 resampler with edge-aware sharpening, which keeps every real pixel of your photo and never invents detail. AI upscalers can look impressive but routinely hallucinate textures, text and faces. If you want a generative redraw, the photo quality enhancer on this site offers AI levels that use your own Gemini key.
What is the maximum size I can upscale to?
Up to 4× and up to 4096 px on the longest side (about 13 megapixels). If 4× would exceed that, the tool uses the largest factor that fits and shows you the exact factor it applied, for example "3.2×".
Will upscaling fix a blurry photo?
No. Upscaling adds pixels, not focus. If the source is soft, use the unblur tool first and then upscale the sharpened result — that order gives the best outcome.
Is it really free, and is there a watermark or daily limit?
Yes, it is free with no signup, no watermark and no daily cap. Everything runs in your browser, so there is no server quota to run out of.
Should I download PNG or JPG?
PNG is lossless and is the right choice for graphics, screenshots and anything you will edit again. JPG at 92% quality is several times smaller and is fine for photos going to the web or WhatsApp.
Why does the preview look the same size as the original?
The before/after view is scaled to fit your screen so you can compare them. Press 100% (or double-click the picture) to see the real output pixels, then drag to pan — the original stays locked to the same spot, so the comparison is exact.