HD photo converter, free in your browser
OpenPixels (openpixels.app) is a free, open source photo enhancer that runs on your own device. As an HD photo converter, it enlarges a small or low-resolution photo with an AI model and clears noise and JPEG blocks in the same run. The photo is never uploaded.
No account to try, no watermark. Saving the result takes a free sign-in. Works offline once its model has downloaded.
Which size the HD photo converter needs.
There is no “HD” button. Under Size you choose 2×, 4× or 8×, and the result is the original width and height times that number. HD (720p) is 1280 × 720 pixels and Full HD (1080p) is 1920 × 1080, so look at the long side of your photo:
For 1080p
The long side has to reach 1920 pixels. Choose 2× from 960 px, 4× from 480, 8× from 240. A 960 × 540 picture comes out at 1920 × 1080.
For 720p
The long side has to reach 1280 pixels. Choose 2× from 640 px, 4× from 320, 8× from 160. A 640 × 360 thumbnail comes out at 1280 × 720.
Already large enough
If the photo is already 1920 px or more but looks noisy or blocky, choose Same size, just cleaner: it keeps the size and only cleans the photo up.
The result keeps your photo’s own shape. An upright or square photo is not cropped to 16:9, so it reaches HD on its long side rather than being exactly 1920 × 1080.
Use the HD photo converter in five steps.
- Open the app and press Choose a photo, or drop the photo anywhere on the page.
- Under Size, choose the multiplier from the list above.
- Keep What is it on Photograph and Noise and grain on Reduce; both are the defaults.
- Press Enhance, then drag the slider to compare Original with Result.
- Press Save the photo. You get a PNG named after your file with the size added, such as
holiday-2x.png. Saving takes a free sign-in.
On a phone it is the same page: open openpixels.app in the browser, with no app to install. A phone holds the result to about 16 megapixels and a computer to about 40. Full HD is about 2 megapixels, so 1080p fits on both.
The HD photo converter checks its own result.
After the enlargement, OpenPixels shrinks the result back to the size you started with and compares the two. When they still match, the panel under the result says Faithful to the original: the detail was enlarged rather than invented. The same panel says how much sharper the result is and how the noise changed.
What HD can and cannot mean here.
Converting a photo to HD adds pixels. It cannot recover detail that was never captured: a small, clean photo converts well, and an out-of-focus photo stays soft, only larger. For a slightly soft photo, try the image sharpener; for a face that has gone soft, turn on face restoration.
When a photo is already large, the app says how far it can enlarge it before anything runs.
Open the HD photo converter.
Going bigger than HD? See upscale image to 4K. Converting a whole folder? Use the batch image upscaler.
Open OpenPixels →Before you open it.
Is this HD photo converter free?
Yes. There is no watermark, no credits and no limit on how many photos you convert. Trying it needs no account; saving a result takes a free sign-in. The photo is processed on your own device and never uploaded.
Is there an HD button?
No. You choose 2×, 4× or 8×. For 1080p, pick the multiplier that takes the long side of the photo to 1920 pixels or more: 2× from 960, 4× from 480, 8× from 240. For 720p the target is 1280: 2× from 640, 4× from 320, 8× from 160.
Which format does the HD photo converter save in?
PNG, with nothing stamped on it. Any still image your browser can open goes in, including JPEG, PNG and WebP.
Can I convert a photo to HD on my phone?
Yes. Open openpixels.app in the phone’s browser; nothing is installed and the photo stays on the phone. A phone holds the result to about 16 megapixels, well above Full HD.
Can I convert many photos to HD at once?
Yes. Several at once applies the same size to any number of photos and gives you a ZIP of the results and a CSV of the measurements.