01
Mixed device fleets
Organisations running both Windows and Mac can watermark both (macOS currently provides full-screen watermarks).
Curtain MonGuard · Windows & macOS
Screen watermark software to deter data leaks
Add identifying watermarks to Windows and macOS screens with Curtain MonGuard to deter unauthorized capture and sharing, and help trace leaked screen images.
- Clients for Windows and macOS
- Free version allowed for commercial use
- Admin server runs on Windows
Win + Mac
Client platforms
500+
Applications supported by the application watermark (Windows)
AD / LDAP
Directory service integration
Free
Commercial use allowed; paid edition adds advanced features
Enterprise screen watermarking, tried in seconds
Type your company name and the simulated screen updates instantly. Document, email and USB controls cannot stop someone photographing a screen with a phone. A screen watermark puts identifying details into whatever is captured, helping to close that gap.
Simulated
This PCShared driveRecycle Bin
Departmental budget allocation (not published)
| Department | Q3 actual | Q4 budget | Change |
|---|---|---|---|
| R&D | 4,820,000 | 6,150,000 | +27.6% |
| Marketing | 2,310,000 | 2,040,000 | −11.7% |
| Operations | 1,975,000 | 2,260,000 | +14.4% |
| Human resources | 860,000 | 915,000 | +6.4% |
| IT | 1,440,000 | 1,880,000 | +30.6% |
14:32
Watermark playground
Every setting applies instantly to the simulated screen
Watermark scope
Covers the whole desktop, including every application and the desktop background.
Watermark content fields
Paid-version fields selected. User name and IP address watermarks are available in the paid version only; the free version can display fixed text, computer name, and date and time. The fields actually available depend on your version and settings.
26%
−28°
Medium
11px
What a watermark changes
Drag the divider left and right. The right-hand side is the same computer with watermarking switched on — once the screen is photographed or captured, the watermark details travel with the image, which helps narrow the scope of an investigation.
This PCShared drive
Key accounts and contract values (not published)
| Client | Industry | Annual contract |
|---|---|---|
| Group A | Financial services | 8,400,000 |
| Holdings B | Logistics | 5,120,000 |
| Medical C | Healthcare | 3,760,000 |
| Education D | Education | 1,980,000 |
14:32
This PCShared drive
Key accounts and contract values (not published)
| Client | Industry | Annual contract |
|---|---|---|
| Group A | Financial services | 8,400,000 |
| Holdings B | Logistics | 5,120,000 |
| Medical C | Healthcare | 3,760,000 |
| Education D | Education | 1,980,000 |
14:32
⇆
After an image leaks, what does the watermark give you?
Below is a simulated photograph of a screen taken with a phone. The watermark is unreadable at a glance, but magnified, the identifying details become legible. Drag the magnifier across it.
Simulated
This PCShared drive
Salary bands by grade (not published)
| Grade | Minimum | Midpoint | Maximum |
|---|---|---|---|
| P1 Assistant | 18,000 | 21,500 | 25,000 |
| P2 Officer | 26,000 | 32,000 | 38,000 |
| P3 Manager | 42,000 | 52,000 | 63,000 |
| P4 Director | 78,000 | 96,000 | 120,000 |
14:32
Move your pointer across the image (or drag with a finger)
Details the watermark can reveal
Sweep the magnifier across the image to pick out each one.
- ✓Computer name
PC-ACME-0427 - ✓Date and time
2026-11-10 14:32 - ✓User name
j.chan
All three watermark details can be read from the image, helping to identify the device, user and time involved and narrow the scope of an investigation.
User name and IP address watermarks are available in the paid version only; the fields actually available depend on your version and settings. Screen watermarking does not guarantee that the source of a leaked image can be identified.
Why do businesses need screen watermarks?
Document, email and USB controls cannot stop someone photographing a screen with a phone. A screen watermark puts identifying details into any captured image, which helps close that gap.
02
Remote and hybrid work
The watermark stays on screen when staff view sensitive data at home or on the move, reminding them of data security policy.
03
Narrow down the source
If a screen image leaks, the watermark details can help identify the computer and time involved and narrow the investigation.
Core features
Each feature shows its edition and platform. See the features page for details.
Full-screen watermark
Shows a watermark across the whole desktop, with details such as computer name, date and time.
Free and paid · Windows, macOSApplication watermark
Shows the watermark only on selected applications, leaving others untouched.
Free and paid · currently confirmed on WindowsCustom watermark content
Fixed text, date and time, and computer name; user name and IP address are paid-only.
Content options depend on editionCentral management
Create and deploy watermark policies from the admin server to every computer.
Free and paid · Admin server: WindowsActive Directory / LDAP
Works with existing directory services to simplify user and deployment management.
Free and paidUninstall password
A password is required before the client can be removed, reducing accidental or deliberate removal.
Paid onlyCommon use cases
The images below are illustrative scenario images, not software screenshots.
Internal compliance and data security
Watermark details on a captured image help identify the device, user and time involved, and remind staff to follow data security policy. Whether details such as the user name can be shown depends on the edition and settings.
CCTV viewing stations
Show a watermark on computers that play CCTV footage to deter unauthorized screenshots and recordings. On Windows, the application watermark can limit it to the relevant program.
Training and presentations
Watermark presentation or training screens to deter unauthorized recording or sharing of internal material.
Social media sharing
A visible watermark deters staff from photographing sensitive data and posting it on social media. If an image leaks, the watermark details can help narrow the investigation.
Confidential document review
When reviewing financial, legal or R&D material, the watermark keeps reminding reviewers that the data is protected.
Watch the product in action
Watch the software in action and see how to set the watermark content and where it appears.
Switch versions to see the difference
Switch between versions to see what the free version includes and what the paid version adds.
Full-screen watermark
Displays a watermark across the whole desktop, which can include the computer name, date and time.
Free and paid · Windows, macOSApplication watermark
Displays a watermark only in selected applications, leaving others unaffected.
Free and paid · Confirmed on WindowsCentral management
Create and deploy watermark policies from the management server across every computer.
Free and paid · Management server: WindowsActive Directory / LDAP integration
Works with your existing directory service to simplify user and deployment management.
Free and paidUser name and IP address watermark
The watermark can additionally show the signed-in user name and IP address, making the identifying details more specific.
Paid version onlyUninstall password protection
A password is required before the client can be uninstalled, reducing the risk of accidental or deliberate removal.
Paid version onlyVersion and platform availability for each feature follows the published product information; see the product page for details.
Drag the slider to estimate your cost
Estimated instantly from the paid edition reference price of US$10.12 per computer per year, billed annually, with a minimum order of 5 PCs. The final quotation, applicable version and any discounts are confirmed by the sales team.
50computers
51,000
An estimate based on the published reference price. It is not a quotation.
Per computer per yearUS$10.12
Per computer for 3 years (about 10% off)US$27.32
Company-wide, per year (estimate)US$506
The final quotation is confirmed by the sales team.
Request a formal quotationPricing at a glance
The paid edition starts at US$10.12 per PC per year, with savings on multi-year terms. Reference prices for each edition are below.
| Edition | Yearly | Every 2 years | Every 3 years |
|---|---|---|---|
| Curtain MonGuard paid editionFull-screen and application watermarks, custom watermark content, user name and IP address watermarks, unified management portal, uninstall password, AD/LDAP integration, technical support and updates. | US$10.12 | US$19.23 | US$27.32 |
| Curtain MonGuard + LogTracePaid edition features plus file activity monitoring: file operation, print and application logs, with MySQL / MS SQL database support. | US$20.24 | US$38.46 | US$54.65 |
| Curtain MonGuard + PrintTrailPaid edition features plus printout watermarks and print file operation logs. | US$20.24 | US$38.46 | US$54.65 |
| Curtain MonGuard FreeBasic screen watermarks and central management; may be used commercially. | Free · Request the free version | ||
- Prices are shown in US dollars.
- About 5% off for 2 years and 10% off for 3 years, already reflected in the table.
- Feature availability varies by platform; see the Windows and macOS page.
- The minimum order is 5 PCs. The final quotation, applicable edition and discounts are confirmed by the sales team; this site has no online payment, so submit a request and the sales team will follow up.
Start with the free version, upgrade when needed
Both editions may be used commercially. The free version suits evaluating basic screen watermarks and central management. When you need user name or IP address watermarks, an uninstall password or other advanced management, look at the paid edition.
Reference price: US$10.12 per PC per year, billed annually; US$19.23 for 2 years, US$27.32 for 3 years
The minimum order is 5 PCs. Final quotation, applicable edition and discounts are confirmed by the sales team.
- 1
Submit a request
Tell us about your company and environment.
- 2
We contact you
We confirm the edition you need and the platforms it will run on.
- 3
Get download and installation details
The sales team provides them as agreed with you.
Frequently asked questions
What is Curtain MonGuard?
Curtain MonGuard is screen watermark software for Windows and macOS. Administrators can show a watermark on user computers with fixed text, computer name, date and time, plus user name and IP address in the paid edition. It deters unauthorized capture and sharing and, if an image leaks, helps narrow the investigation.
Can a screen watermark completely prevent data leaks?
No. Screen watermarks deter misuse and help with tracing. They cannot stop every photo or screenshot, and they do not guarantee that the source of a leaked image can be identified. Use them alongside other data security measures.
Does Curtain MonGuard support Mac?
Yes. Clients show screen watermarks on Windows and macOS. Application watermark: currently confirmed on Windows; public information for macOS currently confirms the full-screen watermark only. The admin server runs on Windows.
What does the free version include?
The free version includes screen watermarks (fixed text, date and time, computer name), full-screen watermark, application watermark (currently confirmed on Windows), conditional display, Active Directory integration, self-protection and central management. User name and IP address watermarks, the uninstall password and other features are in the paid edition.
Want to evaluate screen watermarks in your organisation?
Use the on-site form to request the free version or explore a trial of the paid edition.