Upscale image 4×
Upload an image and FileTinker enlarges it 4× using high-quality resampling, right in your browser. Nothing is uploaded; the bigger image downloads instantly.
More presets
Jump to another preset — each opens its own page ready to go:
How to upscale an image 4×
- Upload your image — it's processed in your browser, never uploaded.
- FileTinker enlarges it 4×; you can switch scale with the buttons above.
- Download the enlarged image, ready to use.
About 4× upscaling
Enlarging an image 4× interpolates new pixels between the originals. FileTinker uses stepped, smoothed resampling for a cleaner result than a plain stretch — handy for printing bigger or filling a larger frame.
It's interpolation, not AI super-resolution, so it can't invent detail that isn't there. Everything runs locally in your browser, so your image stays private.
4x quadruples each edge — sixteen times the pixels — which flatters clean sources most: logos, screenshots, diagrams and flat art stay crisp through the stepped resampling. Photos enlarge smoothly but read softer up close, since real detail that was never captured cannot be conjured back.
Frequently asked questions
How do I upscale an image 4×?
Upload your image and FileTinker enlarges it 4× with smoothed, stepped resampling, then lets you download it. You can switch to another scale with the buttons above.
Will 4× upscaling add detail?
No. Upscaling 4× makes the image larger and smoother but can't recover detail that isn't in the original. Start from the sharpest source for the best result.
What formats work?
Common formats including JPG, PNG and WebP. PNG and WebP keep their format; others download as a high-quality JPEG.
Is my image uploaded?
No. The 4× enlargement runs entirely in your browser; your image never leaves your device.
Why does my photo look soft after 4x upscaling?
At sixteen times the pixel count, the resampler is spreading the original's information much thinner — smooth, but soft at 100 percent zoom. Start from the largest original you have, and save 4x for graphics and text, which survive it far better than fine photographic texture.