How to fix pixelated or low-resolution photos

Updated 13 October 2026 · UnBlur AI guides · 10 sources

AI results are estimates. AI restoration predicts what a sharper or repaired photo might look like. It can invent or change details, especially faces, text and fine patterns. Always keep your original, and do not use an AI-restored image as evidence or to identify someone.

To fix a pixelated photo, start by looking for a bigger version of it: the original on your phone or in iCloud, the sender's file, an old backup or the source website. A larger original fixes the problem completely; everything else is damage control. If no better copy exists, you can resize it smoothly, or use an AI upscaler and accept that some of the new detail is predicted.

What "pixelated" actually means

Two different problems get called pixelation:

• Too few pixels. A small image (a thumbnail, a cropped face, a photo from an early phone) is shown or printed much larger than its pixel count supports, so you see square blocks or jagged edges. Digital zoom causes the same thing at capture time, because it crops and scales up without adding optical detail ⁷.
• Heavy compression. JPEG's lossy modes process the image in 8 × 8 pixel blocks ¹. At strong compression those blocks become visible, especially in skies, skin and around text, even if the image has plenty of pixels.

Knowing which one you have matters. A compressed photo with many pixels often cleans up well; a tiny photo needs real enlargement.

Step 1: Find the original

1. Check iCloud. With Optimize Storage on, your device keeps space-saving versions while iCloud stores originals at full resolution; originals can be downloaded over Wi-Fi or cellular ². If you have room, Settings > your name > iCloud > Photos > iPhone Storage > Download and Keep Originals keeps full versions on the phone ³.
2. Ask the sender. Photos received through messaging and social apps are usually reduced. Ask for the original file, sent by AirDrop, email attachment or a shared cloud link. See why photos look blurry after you send them.
3. Search old devices and backups. Old computers, memory cards, external drives and email attachments often hold the full-size file.
4. Go back to the print. If the photo came from a print, rescan the print at a higher resolution rather than enlarging a small scan. See how to scan old photos properly.

Step 2: Use the image at a size it can handle

A small image often looks fine when shown small. Divide its pixel dimensions by 300 to get the size it prints sharply at, or by 200 for a looser limit; the arithmetic is explained in megapixels, PPI and DPI explained. A 1000 × 750 photo makes a sharp print of about 3.3 × 2.5 inches, and a pleasant 5 × 3.75 inch print at 200 ppi.

Step 3: Enlarge it smoothly

If you must go bigger, resample with a smooth method (often called bicubic) rather than "nearest neighbor", which keeps the blocks. Smooth resampling invents new pixels based on the surrounding ones, giving a bigger but fuzzier image ⁴. That trade is usually better than visible squares. Then:

1. Reduce compression blocks first with a little noise reduction; in Photos, tap Edit, then Adjust and find Noise Reduction ⁸.
2. Enlarge in one step to the final size.
3. Add gentle sharpening last, at the final size, and check edges for halos ⁹.
4. Save as a new file. Keep the original untouched.

Step 4: AI upscaling, with care

AI super-resolution models learn how small images map to large ones from many example photos ¹⁰. Generative versions produce realistic textures where older methods looked smooth ⁵. The price is fidelity: there is a mathematical trade-off between how real a restored image looks and how close it stays to the truth ⁶. On a pixelated face, the model has to decide what the eyes, teeth and skin looked like, and it may produce a convincing face that is subtly someone else. On text, it may produce the wrong letters; see fixing blurry screenshots and text.

UnBlur is aimed at this kind of small or soft image. Its standard modes return about one megapixel, and Ultra HD returns up to 2048 pixels per side (about 4 megapixels), so a 640 × 480 photo can come back several times larger. It will not turn a thumbnail into a poster. Compare ORIGINAL and ENHANCED closely, keep the original, and do not use the result to identify anyone.

Common questions

Sources and further reading

1. Library of Congress, Sustainability of Digital Formats. JPEG Image Encoding Family. loc.gov
2. Apple Support. Set up and use iCloud Photos. support.apple.com
3. Apple Support. Back up and sync your photos and videos with iCloud on iPhone. support.apple.com
4. Vanderbilt University Center for Teaching. What Resolution Should Your Images Be? (PDF). cft.vanderbilt.edu
5. Ledig C, et al. Photo-realistic single image super-resolution using a generative adversarial network. IEEE CVPR. 2017. arxiv.org
6. Blau Y, Michaeli T. The perception-distortion tradeoff. IEEE CVPR. 2018. arxiv.org
7. Wikipedia. Digital zoom. en.wikipedia.org
8. Apple Support. Edit photos and videos on iPhone. support.apple.com
9. GIMP 2.10 documentation. Sharpen (Unsharp Mask). docs.gimp.org
10. Dong C, Loy CC, He K, Tang X. Image super-resolution using deep convolutional networks. IEEE TPAMI. 2016. doi.org