Measured detail
Lanczos resizing comes first. Sharpening is then capped by resize amount and destination so it cannot simply mask lost detail.
SuTu
Keep the detail before you share.
Import up to 20 photos, choose a publishing destination, then preview dimensions, file size, and compression-aware processing. Originals stay untouched and photos never leave your device.
Preparing for the App Store
- On-devicePhotos never leave your device
- Up to 20Batch edit and export
- iOS 16+Made for iPhone and iPad
A shorter path to a clear share
Three steps, without learning another photo editor
- 01
Choose photos
Import from Photos, Files, the clipboard, or iPad drag and drop, up to 20 at a time.
- 02
Choose a destination
Review suggested dimensions and expected size, then adjust composition, format, and fine controls.
- 03
Save clear copies
Save all selected results together, or use the system share sheet to store or send them.
Six visible starting points
Let recipes handle platform differences, not guesswork
Built-in recipes provide starting points for dimensions, target size, and compression-aware sharpening. They are conservative engineering guidance, not official platform specifications.One batch, each crop stays independent
One workbench for import, comparison, and export
A batch shares one publishing recipe while every photo keeps its own composition. Hold to see the original, drag the divider to compare, then save portrait, landscape, or both.- WeChat Moments
- Original ratio and experimental 2K option
- REDnote
- 3:4 guidance with per-photo crops
- Short-video covers
- 9:16 guidance without automatic cropping
- More destinations
- Instagram, WhatsApp, X, Telegram, and more
Only the processing you need, with every choice visible
Dimensions, format, target size, and sharpening live in one previewable workflow. Every export starts from the original data to avoid repeated JPEG recompression.Predictable size
JPEG encoding searches for the highest usable quality above a floor, reducing pixels only when quality alone cannot meet the target.
Your composition
Aspect ratios are suggestions, never silent crops. Crop, rotate, and flip remain independent for every photo.
Privacy by architecture
Offline processing is the architecture
Your photos are yours. SuTu needs no account and runs no server that receives them.- Only photos you explicitly select are made available to the app.
- Location, device, and other sensitive source metadata are removed by default.
- No ads, analytics, tracking, or third-party crash collection SDKs.
Need help?
The support center covers importing, batches, saving, formats, and privacy.