Image Processing Apps for Mac
SoNice! develops three image processing apps for Mac. All processing happens locally on your Mac — your images never leave your machine.
Three apps, one philosophy
Our apps share three design principles.
- Local processing — Images are never uploaded to the cloud. Safe for confidential work and personal photos alike.
- Batch processing — Convert hundreds of images at once with drag-and-drop. Don't waste a creator's time.
- Modern formats — Full support for HEIC, WebP, and AVIF, the formats that today's web and mobile demand.
Pick the right tool for the job
Image Tool+
For people who want one tool for everything.
An all-in-one image processing app with conversion, resizing, compression, watermarking, background removal, and renaming. With HDR and wide color gamut support, it's built for professional photo workflows.
WebP Converter.
For people who want to make their websites faster.
Bulk-convert PNG, JPG, GIF, and more to WebP. A focused tool for web developers and bloggers, built to directly improve LCP in Core Web Vitals.
AVIF Converter.
Get ahead with the next-gen format.
Convert images to AVIF — about 50% smaller than JPEG, with HDR, wide color gamut, and 10/12-bit depth support. Adopt the future of image delivery today.
Which one should you choose?
| If you... | We recommend |
|---|---|
| Process large volumes of images daily / Are a professional photographer or designer | Image Tool+ |
| Want to convert your blog or corporate site images to WebP | WebP Converter. |
| Want to deliver smaller, better-looking images with the latest format | AVIF Converter. |
| Need background removal and watermarking in one place | Image Tool+ |
Common technical foundations
All three apps are built with Swift / SwiftUI and run natively on Apple Silicon (M1/M2/M3). They use Apple's image frameworks together with reference implementations such as libwebp and libavifto balance quality and speed.
Each app runs inside macOS's App Sandbox — a strong, OS-enforced security mechanism. The app can only access files you explicitly hand to it via drag-and-drop or a file picker. "Trust us" is replaced with "the OS won't allow otherwise."
FAQ
Q. WebP or AVIF — which should I pick?
The best practice is both, with fallbacks. Use <picture> with AVIF first, WebP second, and JPEG/PNG as the final fallback. AVIF-capable browsers get ~50% smaller files, WebP-capable browsers get ~30% smaller files, and older clients still see a normal image.
If you have to choose one: WebP Converter. for broad compatibility,AVIF Converter. for maximum savings.
Q. How is Image Tool+ different from the other two?
Image Tool+ is the all-in-one app: multi-format conversion (WebP/AVIF/PNG/JPG/HEIC), plus background removal, watermark, and rename — for ¥1,300 one-time.WebP Converter. andAVIF Converter. specialize in their own format and start free. Pick the all-in-one if you want one app for everything, or start with a focused free tool.
Q. Is everything really local?
Yes. All three apps run inside macOS's App Sandbox with no network access. Images cannot leave your Mac structurally — not by policy.