Upscale image to 4K
Set the long edge to 3840 pixels, the width of a 4K UHD screen, in one step. The instant upscale runs on your device; the AI detail pass rebuilds fine texture for prints and big displays.
Instant upscale runs on your device. The AI detail pass sends a 1024px copy to our AI provider, which redraws fine texture; the result is then scaled to your chosen size (capped at 4096px wide).
How to upscale image to 4K
Open your photo
Best results come from the original file, not a screenshot or a copy saved from a chat app.
Upscale to 4K
4K is preselected. The panel shows the exact output pixels and megapixels.
Check and save
Turn on the loupe to inspect edges. Save PNG for editing or JPEG for sharing.
How much upscaling 4K needs
A 12-megapixel phone photo is about 4000 × 3000 pixels and is already 4K wide. A 1080p frame needs 2×. A 960px image from a messaging app needs 4×, which means 15 of every 16 pixels are invented. The bigger the jump, the more the AI detail pass helps.
For 4K wallpapers, crop to 16:9 first with the resizer so the upscale goes into pixels you will actually see.
Need more control? Open the full image upscaler, hd image converter or unpixelate image.
Questions people ask
Can I upscale any image to 4K?
Yes, as long as your device has the memory. A 4K output is about 8 to 12 megapixels, which every modern phone and laptop handles.
Is 4K the same as 3840 × 2160?
4K UHD is 3840 × 2160 for 16:9 screens. This tool sets the long edge to 3840px and keeps your photo’s own aspect ratio, so a 4:3 photo becomes 3840 × 2880.
Is AI upscaling to 4K better?
For textures like hair, foliage and fabric, usually yes. For text, numbers and logos, the instant upscale is safer because AI can invent wrong characters.