MotionShineShort answer: To enlarge a photo and keep it sharp, use an AI upscaler rather than a plain resize. Drop the photo into the free AI image upscaler, pick 2x, 3x, 4x or an exact width, compare, and download. If the photo is also soft or blurry, use the AI photo enhancer instead, which sharpens at the same size or larger. A plain resize, such as Preview's Adjust Size on a Mac, is fine for small steps. No method adds detail the camera never caught, so faces and small text in a tiny photo are a guess.
Apple facts come from Apple Support's Preview guide, checked on 7 November 2026. The free tools are made by the maker of MotionShine, and what I say about them comes from their own pages.
Why photos go soft when you make them bigger
A photo is a grid of pixels. To make it twice as wide, the software has to fill four times as many pixels. A plain resize fills them by blending the pixels around each new one. Nothing new is added, so edges get soft and text gets fuzzy. An AI upscaler has learned what sharp edges, letters and textures usually look like, and draws them at the larger size. That is a better guess, but still a guess.
Which method to use
| Method | What it does | Good for | Weak point |
|---|---|---|---|
| Plain resize (Preview, image resizer) | Stretches the pixels you have | Small steps, a photo that is almost big enough | Soft edges at 2x and above |
| AI image upscaler | Draws new edges and detail at 2x, 3x, 4x or a set width | Screenshots, logos, illustrations, clear photos that are small | Tiny faces and text can come out wrong |
| AI photo enhancer | Sharpens a soft photo and can enlarge it up to 4x | Blurry, compressed or low light photos | Very blurry photos can look painted |
| Image to SVG | Turns a logo into shapes that scale to any size | Flat logos and icons | Not for photos |
Method 1: An AI upscaler in your browser
The free AI image upscaler runs an open model called Real-ESRGAN on your own graphics card in the browser tab. Its page says the picture is never uploaded, there is no sign-up, no watermark and no monthly count, and the model is under 3 MB.
- Drop one photo or several on the box, click to choose, or paste one with Cmd+V. PNG, JPG, WebP and HEIC work.
- Open Make it larger. Each scale shows the size it would give, and scales that would be too big are marked. Pick A set width to type an exact width in pixels.
- Leave AI strength at 100% to start.
- Click Upscale the picture. The status line shows each part and the time left.
- Drag across the picture to compare it with a plain enlargement, and click See it at full size to check the details.
- If skin, hair or grass look painted, lower AI strength to 60% to 80%. The page says this mixes in a plain enlargement and updates without running the AI again. Then click Download the picture, or Download all as ZIP for a batch.
The page lists one hard limit: the result can be at most 16.7 million pixels, which is 4096 x 4096, the largest picture every current browser can save. So a 1920 x 1080 picture can go to 2x (3840 x 2160) but not 3x. If you only need part of the photo, crop it first and you can use a higher scale.
A see-through PNG logo comes back as a larger see-through PNG, according to the page.
Method 2: The AI photo enhancer, when the photo is also soft
If the photo is blurry or blocky from compression, enlarging alone will make a bigger blurry photo. The free AI photo enhancer uses the same open model, with one extra choice: how soft the photo is now.
- Drop the photo in the box.
- Set How sharp is it now? to A little soft to start.
- Pick a Size: Same size, 2x or 4x.
- Click Enhance the photo. The page says the model is about 2.4 MB.
- Compare, and if it is still soft, try Blurry or Very blurry. If it looks painted, lower AI strength.
The page explains why the stronger settings work: the photo is first made smaller, which shrinks the blur to a size the model can handle, then the model makes it four times larger again. The trade is that shrinking throws away fine detail, which the model then has to guess.
Method 3: Preview on a Mac, for small steps
Preview is already on every Mac. Apple's guide for resizing an image in Preview:
- Open the photo in Preview.
- Choose Tools > Adjust Size. The Markup toolbar also has an Adjust Size button.
- Turn on Scale proportionally, so the height follows the width.
- Keep Resample image on, then type the new width or height.
- Save. Work on a copy of the file if you want to keep the original as it was.
This is a plain resize. Apple's guide gives no advice about quality when making a picture larger, so treat it as fine for a small increase and use an upscaler for 2x and more. To change only the print size without touching the pixels, Apple's guide says to turn Resample image off. The free change image DPI tool does the same thing in a browser.
How many pixels a print needs
Print needs more pixels than a screen. A common target is 300 pixels per inch, so multiply the print size in inches by 300.
| Print size | Pixels at 300 per inch | Fits under the upscaler's 16.7 MP limit? |
|---|---|---|
| 4 x 6 in | 1200 x 1800 | Yes |
| 5 x 7 in | 1500 x 2100 | Yes |
| 8 x 10 in | 2400 x 3000 | Yes |
| 11 x 14 in | 3300 x 4200 | Yes (13.9 MP) |
| 16 x 20 in | 4800 x 6000 | No (28.8 MP) |
Pick the smallest scale that reaches the size you need. The upscaler's page says a larger scale asks the model to invent more detail, and the more it invents, the more chance of something looking off. A 600 x 400 photo at 3x gives exactly 1800 x 1200, enough for a 6 x 4 inch print. For a 10 x 8 inch print, type a width of 3000 in A set width.
What enlarging cannot fix
- It cannot add real detail. The upscaler's page is plain about this: the model draws detail that looks likely, based on many pictures it learned from. Anything that was never captured is a guess.
- Tiny faces can change. A face only a few pixels wide may come out sharp but not quite like the person. Compare it with the original, especially for family photos. For old portraits, the photo restorer rebuilds faces with a face model, covered in how to restore old photos.
- Unreadable text stays unreadable. Text too small to read can turn into letter-like shapes. Never trust upscaled numbers, names, number plates or codes.
- Motion blur and missed focus barely improve. Try unblur image first.
- Each pass invents more. Running a result through again usually adds a painted look. One pass at the scale you need is the most faithful.
Tips for the sharpest result
- Start from the original file. A photo that has been shared and saved again has lost detail each time. Ask for the first copy if you can.
- Crop before you enlarge, so the pixel limit goes to the part you keep. How to crop a screenshot on Mac shows the quick ways.
- Enhance before you edit. Sharpen first, then brighten and add filters, so the edits work on clean detail.
- Pick PNG for logos and screenshots, JPG for photos. The upscaler's page says JPG and WebP files of photos are much smaller, which matters at 4x.
- Shrink the file after, with the image compressor, if a site or email has a size limit.
FAQ
How do I enlarge a photo without losing quality for free?
Use a free AI upscaler such as the AI image upscaler. It runs in your browser, adds sharp edges at 2x to 4x, and has no sign-up or watermark. A plain resize is free too, but it gets soft at 2x and above.
Can I enlarge a photo on a Mac without an app?
Yes. Preview is built in: Tools > Adjust Size, keep Scale proportionally and Resample image on, and type a new size. It is a plain resize, so it suits small steps. For more, use a browser upscaler.
How much can I enlarge a photo?
With the AI upscaler, up to 4x, as long as the result stays under 16.7 million pixels. In practice, the smallest scale that reaches your target looks the most natural.
What resolution do I need to print a photo?
A common target is 300 pixels per inch. An 8 x 10 inch print needs 2400 x 3000 pixels, and a 4 x 6 inch print needs 1200 x 1800.
Does upscaling a photo add real detail?
No. It adds detail that looks likely, which reads as sharper to the eye. Anything the camera never caught, such as a small face or a line of text, is a guess.
Are my photos uploaded?
Not with these tools. Their pages say the AI model is downloaded to your browser and runs there, so the photo never leaves your computer.
