Image Upscaler
ImageMake a small picture 2× or 4× larger with an AI model that adds the detail plain enlarging blurs — on your device.
Image Upscaler makes a small picture two or four times larger — a logo you only have as a thumbnail, an old photo, a product shot from a supplier, an AI picture made at 512 pixels. Ordinary enlarging spreads each pixel over several and the result goes soft; this uses Real-ESRGAN, an AI model trained to draw the edges and texture a sharper picture would have had. It runs on your device: the model is downloaded once from Alvseike, about 5 MB, uses the graphics card in Chrome and Edge on a computer and the processor elsewhere, and the picture is never uploaded. Compare the result with ordinary enlarging at 100% before you use it — the model adds detail that looks right, but it cannot bring back what the camera never caught, and faces that are small in the picture can come out wrong. The result keeps the picture's format and its transparency.
Why use Image Upscaler
100% private
Your image files are processed locally and never uploaded.
Instant
No upload or download wait — it runs at the speed of your device.
Free to start
Use it free every day; go Pro for unlimited runs.
No install
Works in any modern browser. No sign-up to begin.
How to use Image Upscaler
- 1Add the picture
PNG, JPG or WebP. Small pictures gain the most: up to 1,024 × 1,024 for 4×, up to 2,048 × 2,048 for 2×.
- 2Choose 2× or 4× and upscale
The model is downloaded once and runs on your device, part by part; the bar shows how far it has come, and Stop ends it.
- 3Compare, then download
Look at 100% and switch between the result and ordinary enlarging. Download keeps the picture's format and transparency.
Frequently asked questions
Is my picture uploaded to be upscaled?
No. The AI model runs in your browser, on your device. What is downloaded is the model itself, about 5 MB from Alvseike, the first time — your browser keeps it.
How large can the picture be?
The result can be up to 16.7 megapixels, the largest picture a browser holds on every device, phones included. So 4× takes a picture up to 1,024 × 1,024 (or any shape of the same area) and 2× one up to 2,048 × 2,048. Upscaling is for small pictures: a photo from a phone is already larger than either.
Does it really add detail?
It adds detail that looks right, not detail that was there. The model has learnt what sharp edges, hair, foliage and text strokes tend to look like, and draws them where ordinary enlarging would blur. It cannot read a number plate that was a smudge, or bring back a face too small to see — small faces can come out wrong. Switch between Upscaled and Original at 100% to judge it for your picture.
How long does upscaling a picture take?
A 512 × 512 picture takes about a second and a half on a computer's graphics card, which Chrome and Edge use, and about 17 seconds on the processor alone, which Safari and phones use here (measured on a recent Mac; a phone can take longer). The bar shows how far it has come, and Stop ends it.
Is it good for logos and text?
For a small logo or a screenshot, yes: edges come out clean instead of soft. A logo that has to scale to any size is better as a vector — Image to SVG traces it into shapes that stay sharp at every size.
Does it keep transparency and the format?
Yes. A JPG comes back as a JPG and a PNG as a PNG, and transparent areas stay transparent: the model enlarges the colours, and the transparency is enlarged smoothly alongside.
Which model is it?
Real-ESRGAN's small general model (realesr-general-x4v3) by Xintao Wang and colleagues, released under the BSD-3-Clause licence, set to the project's own default noise reduction. Its licence is served beside the model.
Does it count as a run?
Each upscale is one run of the daily allowance. Comparing and downloading the result again are free.