4× image upscaler — free online tool
Quadruple width and height in the browser: 1920 x 1080 becomes 7680 x 4320. Sixteen times the pixels; sources up to 4 MP fit the 64 MP cap.
The preview will appear here after you select a file.
What to know
This page opens with the Scale menu already on 4x. Each edge is multiplied by four and the pixel count by sixteen, so 800 x 600 becomes 3200 x 2400 and a 1920 x 1080 frame becomes 7680 x 4320, which is 33.18 million pixels on the 8K grid.
The 64 million pixel output cap is what you meet first. Sources up to 4 million pixels work: a 2560 x 1440 screenshot gives 10240 x 5760 (58.98 million pixels) and fits, while a 3000 x 2000 photo would need 96 million and stops with a size message. When a source is too large, use the 2x page or crop first.
Fifteen of every sixteen pixels in the result are computed by interpolation, so this is for artwork that tolerates softness: a small logo going onto a banner viewed from a distance, a 640 x 480 clip frame, or an icon that must reach a minimum edge length. Fine text and thin lines will look smooth but not crisp.
One pass at 4x is enough; running 2x twice gives about the same look and adds a second re-encode at quality 0.92. A 7680 x 4320 PNG can be tens of megabytes, and the in-session results list holds 64 MB in total, so download results as you go.
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How to use 4× image upscaler — free online tool
- Add a small source such as a 2560 x 1440 PNG, no more than 4 million pixels.
- Check that the Scale menu already reads 4x; it is preset on this page.
- Press Upscale image and look for 10240 x 5760 in the status line.
- Download the result before adding another large image to the queue.
Quick answers
How big is a 1920 x 1080 image at 4x?
It becomes 7680 x 4320, an 8K grid with about 33.2 million pixels. That is under the 64 million pixel limit, so it processes normally.
Why does a 12 megapixel phone photo not work at 4x?
Four times the edges means sixteen times the pixels, so 12 million becomes 192 million. The cap is 64 million, so the source must be 4 million pixels or less.
Is 4x once better than 2x twice?
About the same visually. One pass avoids a second re-encode at quality 0.92 and a second wait, so it is the cleaner route.
Why is my 4x PNG so large?
PNG is lossless and the result has sixteen times the pixels, so photographic content can reach tens of megabytes. A JPG or WebP source gives a smaller output in its own format.