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Teaching and tutoring
Explain lessons over slides, websites, videos, diagrams, and worksheets. Use a ruler, protractor, compass, spotlight, or whiteboard when the topic needs more than a basic pen.
Built for Windows 11 & Windows 10
Screen annotation software for Windows
Draw, highlight, point, teach, and present over any app or desktop. OS Pen keeps useful annotation, precision, presentation, screenshot, and recording tools in one floating Windows workspace.
Essential Pen, Eraser & Screenshot tools · No account required
A compact annotation toolbar that stays available over your Windows screen.
20+ toolsAnnotation & precision
Windows 11 & 1032-bit and 64-bit installer
Free essentialsNo account to begin
Offline-firstCore work stays on-device
Made for real explanations
Write directly over the screen you are already using
Keep your audience focused without constantly switching between a presentation, a separate whiteboard, and a recording app.
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Presentations and training
Highlight important controls, number steps, point with a laser trail, hide distractions with the curtain, and keep a session timer visible during live walkthroughs.
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Tutorials and demonstrations
Mark up the screen while explaining a process, capture screenshots, create short GIFs, or use Creator Recorder (Beta) for local screen and microphone recording.
One Windows overlay
More than a simple screen pen
Use only the tools you need, while keeping the rest close enough for detailed lessons, technical support, training, and recorded tutorials.
✓
Pen, highlighter, shapes, and text
Draw freely or add clearer structure with shapes, arrows, labels, colours, and adjustable stroke controls.
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Ruler, protractor, compass, and coordinates
Use precision tools for geometry, diagrams, measurements, and technical explanations instead of rough freehand marks.
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Spotlight, curtain, laser pointer, and timer
Guide attention during a class or presentation without editing the original content underneath.
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Whiteboard and saved sessions
Move from screen markup to a clean board, choose backgrounds or grids, and save work for later.
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Screenshots, GIFs, PDF export, and redaction
Capture what you explained and prepare a shareable result without assembling several unrelated utilities.
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Local Wi-Fi collaboration (Premium Beta)
Host a Windows session and let supported devices join on the same local network for shared annotation.
Start simply
Annotate your Windows screen in three steps
Download once
Use the combined Windows installer. It detects whether your PC needs the 32-bit or 64-bit application.
Open the floating toolbar
Choose the Pen, Eraser, or Screenshot tools immediately, or begin a free trial for the complete toolset.
Explain over any screen
Keep working in your existing app while the annotation layer remains available above it.
Windows questions
Frequently asked questions
Can I draw over any app in Windows?
Yes. OS Pen creates an annotation layer over your Windows screen, so you can draw, highlight, point, and explain while using presentations, browsers, videos, documents, and other desktop apps.
Does OS Pen work on Windows 11 and Windows 10?
OS Pen supports Windows 11 and Windows 10 systems updated from 2020 onward. One installer detects the appropriate 32-bit or 64-bit version.
Can I try OS Pen for free?
Yes. Essential Pen, Eraser, and Screenshot tools can be used free without an account. A verified-email trial is also available for the complete toolset without requiring a credit card.
Does screen annotation require an internet connection?
Core annotation works offline after activation. Internet access is used for activation, updates, and licence verification according to the selected plan. Local Wi-Fi collaboration uses devices on the same network.
Does OS Pen upload my annotations or recordings?
Your annotations, screenshots, and locally saved recording content remain on your device unless you separately choose to upload or share them.
Turn your Windows screen into a working canvas
Begin with the free essentials, or compare plans when you need the complete toolset.