Increase Image Resolution
Turn a low resolution image into a high resolution one: two or four times the width and height, with the detail redrawn by AI instead of stretched. Free up to 1024 px, HD at full resolution.
Drop a photo to enlarge it
or paste with Ctrl+V · JPG PNG WebP HEIC GIF · max 25 MB
Your photo is enlarged on this device and never uploaded. Faces are not retouched: the model sharpens what is there.
How to
How to increase image resolution
- 1
Drop your photo
JPG, PNG, WebP or an iPhone HEIC photo. The free result is made at once, on your device.
- 2
Compare
Drag the slider to see the original and the result side by side.
- 3
Download
Save the free result, or make the HD version at full resolution (2x or 4x).
Why this size
Resolution, pixels and DPI: what actually changes
An image's resolution is its size in pixels, for example 800 x 600. Increasing it means making more pixels: 1600 x 1200 at 2x, 3200 x 2400 at 4x. The question is what goes into the new pixels. A normal resize fills them by blending the old ones, which looks soft. This tool fills them with detail an AI model draws from what it has learned about real photos, so the bigger image looks sharp.
DPI is a different thing. It is only a number in the file that tells a printer how many pixels to put in an inch; changing it does not add any detail. If a form or a print shop asks for 300 DPI, increase the resolution here first, then set the DPI with the DPI tool.
| Print size at 300 DPI | Pixels needed |
|---|---|
| 4 x 6 in (10 x 15 cm) | 1200 x 1800 |
| 5 x 7 in (13 x 18 cm) | 1500 x 2100 |
| 8 x 10 in (20 x 25 cm) | 2400 x 3000 |
| A4 (21 x 29.7 cm) | 2480 x 3508 |
Tips
Tips that make a difference
Work out the pixels you need
Then set the DPI
FAQ
Increase Image Resolution: questions
Checked
How we checked this page
Checked by the SizePort team on .
We compare every size and rule on this page with the official sources below, and test the tool with sample photos before it goes live. Rules and platforms change, so if something here is out of date, tell us and we will correct it.
How the tool works
An open AI model, NERVE (Apache 2.0, trained only on public domain photos), downloads to your browser once (7 MB) and runs there with WebGPU, or on the processor where WebGPU is missing. First the tool measures how sharp your photo is. A sharp photo is given to the model at full detail and only cleaned up, with part of its own pixels kept so it stays natural; a soft or blurry one is given at a smaller size, where the model can rebuild the edges the blur hides. You can also choose Gentle or Strong yourself. The model works at four times the size in overlapping tiles, so any size works without seams, and its result is averaged down to the size you get. The model file is checked against its fingerprint before it runs. Faces are not retouched, and colours and light are left as they are. Everything happens in your browser; your images are never uploaded.