# ShadowSeal — Invisible Watermark

> Invisible Watermark (iPhone/iPad app by 晨 赵.)

- Source: https://appshunter.io/ios/app/shadowseal/id6796939608 (this page in markdown: same URL + `.md`)
- Developer: [晨 赵](https://appshunter.io/developer/1895955829)
- Category: Utilities
- Price: $14.99
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English, Japanese, Chinese (Simplified, China)
- Released: 2026-08-12
- Data updated: 2026-09-29

## What is ShadowSeal?

Protect your digital assets(image/pdf) with invisible watermark technology.

Helps creators, photographers, designers, and professionals protect their file(image/pdf) without changing the original appearance.

Unlike traditional visible watermarks, invisible watermarks stay hidden while preserving ownership information inside your files.

FEATURES

• Invisible watermarking
Add hidden copyright information without affecting file(image/pdf) quality or appearance.

• Local processing
All watermark operations happen on your device. Your files never leave your device.

• Robust protection
Advanced algorithms provide resistance against common image modifications and help preserve watermark information.

• Add & verify
Easily add invisible watermarks or verify ownership by embedded information.

• Multi-platform support
Available on iPhone, iPad, and Mac. Your purchase works across supported devices.

• One-time purchase
No subscriptions. No ads. Pay once and use forever.

Your creations deserve lasting protection.


## Version history (last 1 release)

### 1.0.0 — 2026-08-25

No release notes.

## More apps by 晨 赵

- [StowKey](https://appshunter.io/ios/app/stowkey/id6765795970)
- [Remixit:Creative Photo Collage](https://appshunter.io/ios/app/remixitcreative-photo-collage/id6767089206)

All apps by 晨 赵: https://appshunter.io/developer/1895955829

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-29.*