4K wallpaper: 3840×2160 px
Ultra HD 16:9 size for 4K monitors and TVs. Upscaling small photos to 4K will look soft.
How to resize an image to 3840×2160
- Choose or drop one or more images.
- Pick how to fit: Crop to fill (no borders), Fit with padding (whole image visible) or Stretch.
- Optionally set an output format or maximum file size, then download.
| Size | 3840×2160 pixels |
|---|---|
| Aspect ratio | 16:9 |
| Megapixels | 8.29 MP |
| Print size at 300 DPI | 12.80 × 7.20 in (32.5 × 18.3 cm) |
Other popular sizes
- 600×600
- 1200×1200
- 1080×1080
- 1080×1350
- 1080×1920
- 1200×630
- 1500×500
- 1584×396
- 400×400
- 1280×720
- 2560×1440
- 1920×1080
- 3000×3000
- 1000×1000
- 2000×2000
- 1024×1024
- 512×512
- 800×600
- 640×480
- 300×300
- 200×200
- 150×150
- 32×32
See the full social media & document image size guide →
Frequently asked questions
How do I resize a photo to 3840×2160 pixels?
Drop the image above. It's resized to exactly 3840×2160 px instantly. "Crop to fill" trims the edges so nothing is stretched; "Fit with padding" keeps the whole image and adds a background color.
Will the image be stretched?
No — unless you choose "Stretch". The default crops from the center so proportions stay natural.
What aspect ratio is 3840×2160?
3840×2160 is a 16:9 aspect ratio.
Can I also limit the file size?
Yes. Enter a value in "Max size KB" and the resized image is compressed to fit under that limit.
Are my photos uploaded?
No. Resizing happens in your browser. Nothing is sent to a server, so it is safe for personal photos and documents.