Upscale image
Upload an image and enlarge it 2× or 4× using high-quality resampling. It runs entirely in your browser — nothing is uploaded — and downloads the bigger image ready to use.
Enlarge by
Jump straight to a scale — each opens its own page ready to go:
How to upscale an image
- Upload your image — it's processed in your browser and never uploaded.
- Choose 2× or 4×.
- Click upscale and download the enlarged image.
About upscaling images
Upscaling enlarges an image by interpolating new pixels between the originals. FileTinker uses stepped, smoothed resampling so the result is cleaner than a plain stretch — useful for printing a small image bigger, filling a larger frame, or enlarging a logo or graphic.
It's interpolation, not AI: it can't invent detail that isn't in the source, so a blurry or tiny original stays soft when enlarged. Start from the highest-quality source for the best result. Everything runs in your browser, so nothing is uploaded.
Print is where upscaling pays off most. Printers want around 300 pixels per inch, so a 1200 by 900 image only covers about 4 by 3 inches before it starts to look soft on paper. Doubling it to 2400 by 1800 supports roughly an 8 by 6 print, and 4x stretches the same photo to poster-friendly dimensions. Work out the pixel size your print needs, then pick the factor that reaches it.
Predictability is the trade-off's upside. AI upscalers guess at missing detail, and the guesses can go wrong — warped text, smeared logos, faces that no longer quite match the person. Interpolation never introduces anything that was not photographed, which makes it the safer choice for documents, product shots, evidence, archival scans and anything where accuracy matters more than apparent sharpness. What you see is your image, only larger.
Frequently asked questions
How does the upscaler work?
It enlarges your image with high-quality stepped resampling — each doubling is smoothed — which produces a cleaner result than a single big jump or nearest-neighbour scaling. It's honest interpolation, not AI super-resolution, so it makes images bigger without inventing detail.
Will it add detail that isn't there?
No. Upscaling can't recover detail the original doesn't contain; it makes the image larger and smoother. For the best result, start from the sharpest, highest-resolution source you have.
What formats can I upscale?
Common formats including JPG, PNG and WebP. PNG and WebP keep their format; other formats download as a high-quality JPEG.
Is my image uploaded?
No. The enlargement happens entirely in your browser; your image never leaves your device.
Should I choose 2x or 4x?
Pick the smallest factor that reaches the size you actually need. Going 4x multiplies the pixel count by sixteen, so files get much heavier and any softness in the source becomes more visible. If 2x already meets your target dimensions for the print, slide or frame, stop there — enlarging beyond what you will use adds bulk without adding anything to look at.