# AI Image Upscaler — AI image upscaler for Mac

Enlarge photos 2× or 4× and keep them sharp, with Apple's on-device AI. Several at once. Part of OneMacTools, 151 private tools in one native Mac app (macOS 26 or later); category: Images. Runs on your Mac; nothing is uploaded.

Drop photos or pictures and get them 2× or 4× larger with Apple's on-device super-resolution, which adds believable detail instead of the blur of a plain resize. Big pictures are done in overlapping pieces so there are no seams. Nothing is uploaded. The first time, macOS downloads Apple's model once.

Page: https://www.onemactools.com/tools/ai-image-upscaler · Download: https://www.onemactools.com/download · Pricing: https://www.onemactools.com/pricing

## How to use it
1. **Drop pictures.** Photos, product shots or graphics; several at once.
2. **Choose 2× or 4×.** 2× doubles the width and height; 4× makes them four times bigger.
3. **Click Upscale.** The first time, macOS downloads Apple's model once.
4. **Compare.** Each copy is saved beside the others with 2x or 4x in its name.

## Options
- **Enlarge:** 2× or 4×. 2× is done at 4× and then scaled down, which stays sharper than a plain 2× resize.
- **Save as:** The same format as the original, PNG (lossless) or JPEG (smaller).

## Tips
- Start from the best copy you have: upscaling adds believable detail, but it can't recover what was never there.
- Use 2× for the web and 4× for print.
- Results larger than 16,000 pixels across are refused; choose 2× or crop first.
- Compress the result afterwards with Compress Images if the file is big.
- Photo details like the date taken and camera are kept.

## Questions
**How do I upscale an image on a Mac?**
Drop it into AI Image Upscaler, choose 2× or 4×, and click Upscale. You get a larger, sharper copy.

**Is it better than resizing in Preview?**
Yes. A normal resize stretches the pixels and looks soft; the AI scaler predicts finer detail, so edges and textures stay crisp.

**Is my photo uploaded?**
No. It runs on your Mac's Neural Engine.

**Why does the first upscale take longer?**
macOS downloads Apple's model once. After that it's ready instantly.

**Can it upscale big pictures?**
Yes. Large pictures are processed in overlapping pieces and joined without seams, up to 16,000 pixels across.

**Can I upscale many images at once?**
Yes. Select them all; each gets its own enlarged copy.