Sukemaru: Verified Cutout PNG

You removed the background — but the saved file still looks white.

Most of the time the transparency is fine. What went wrong is the file format, or simply how the Photos app previews transparent pixels. Sukemaru decodes the file it just wrote and measures the alpha channel, so you can tell the difference immediately.


■ Alpha Check — proof, not a promise
Sukemaru analyzes the exported PNG and reports whether an alpha channel exists, what percentage of pixels are fully transparent, and what the real file format is. A strict mode reads the asset back from your photo library after saving, so you can confirm before handing the file to another app.

■ Full-Size Lock — no quality loss
Your image is exported as a lossless PNG at exactly the pixel dimensions you imported. No downscaling, no re-encoding. The original pixel count stays visible on screen.

■ A loupe that shows what your finger covers
While erasing, the area hidden under your fingertip appears in a magnified window, with the brush footprint overlaid, so you can chase edges like hair and fabric precisely. Zoom up to 12×.

■ One-tap automatic cutout
On-device vision detects the subject and clears the background. Anything it misses can be fixed with the eraser and restore brushes.

■ Sticker outlines and backgrounds
Add a white or black outline that follows the shape of your cutout, at the width you choose. Everything outside the outline stays transparent, so the result is ready to use as a sticker. You can also place the cutout on white, black, or one of your own photos (never distorted).

■ Three export routes
· Save to Photos (stores the PNG bytes as-is)
· Export to the Files app
· Hand the file directly to another app
Sukemaru ranks them by how reliably transparency survives.

■ Paid once. No ads, no nagging.
There are no in-app purchases, no advertising, and no review prompts. Everything is available from the moment you download it.

■ Your photos never leave your device
Cutout and verification run entirely on device. Your photos are never uploaded. To improve the app, only anonymous usage data (such as which screens are opened) is counted with Google Analytics (you can turn this off in Settings).


Good for
· Product photos for resale listings and online shops
· Cutting people or products into slides and documents
· Building sticker and icon artwork
· Working out why transparency disappeared after handing a file to another app


Available in 15 languages: English, Japanese, German, Spanish, French, Italian, Portuguese, Polish, Turkish, Korean, Traditional and Simplified Chinese, Thai, Vietnamese, and Indonesian.
Requires iOS 17 or later.