Viewing
CyberViewer provides lightning-fast image viewing with folder browsing, zoom, pan, and fullscreen modes.
Opening Images
Methods
| Method |
Description |
| File → Open |
Select an image file |
| Drag & drop |
Drop image files onto the window |
| Ctrl+V |
Paste image from clipboard |
| Command line |
CyberViewer.exe "path\to\image.png" |
| Context menu |
Right-click image → Open with CyberViewer |
Supported Formats
| Format |
Extension |
| JPEG |
.jpg, .jpeg |
| PNG |
.png |
| GIF |
.gif (animated) |
| WebP |
.webp |
| BMP |
.bmp |
| TIFF |
.tiff, .tif |
Custom Streaming Protocol
CyberViewer uses a custom cvlocal:// protocol:
- Images stream instead of loading fully into RAM
- Instant open even for large files
- Path allowlist security prevents unauthorized access
Folder Browsing
Thumbnail Sidebar
Browse folders with a thumbnail sidebar:
- Lazy loading for performance
- Priority queue (current image loads first)
- Scan progress indicator
- Configurable sidebar visibility
Navigation
| Action |
Description |
| Arrow keys |
Navigate to previous/next image |
| Sidebar click |
Jump to any image in folder |
| First/Last |
Jump to first/last image |
Thumbnail Cache
- LRU-based cache (200 MB / 2000 files)
- Concurrency limiting (3 concurrent renders)
- Automatic eviction of old thumbnails
Zoom and Pan
Zoom Range
- Minimum: 5%
- Maximum: 2000%
- Step: Variable based on current zoom
Zoom Methods
| Method |
Action |
| Ctrl+Wheel |
Zoom in/out at cursor position |
| +/- keys |
Zoom in/out |
| Double-click |
Toggle fit-to-window / original size |
| Zoom buttons |
Toolbar zoom controls |
Zoom Modes
| Mode |
Description |
| Fit to window |
Auto-scale to fit viewport |
| Original size |
1:1 pixel mapping (100%) |
| Custom |
User-defined zoom level |
Pan
- Click and drag to move the image when zoomed in
- Scroll bars appear when image exceeds viewport
- Pan follows cursor position
Fullscreen Mode
Entering Fullscreen
- Press
F11 to toggle fullscreen
- Or use the fullscreen button in toolbar
- Slideshow can auto-enter fullscreen
Fullscreen Features
| Feature |
Description |
| Ghost UI |
Controls auto-hide after inactivity |
| Immersive |
No window chrome or distractions |
| Mouse move |
Moving mouse shows controls briefly |
| Escape |
Exit fullscreen |
Animated GIF
Playback
- GIFs autoplay on open
- Toggle playback with Space or play button
- Frame-by-frame navigation
Settings
| Setting |
Description |
| Animated GIFs |
Enable/disable autoplay |
| Loop |
Continuous playback |
Multi-Monitor
Display Selection
- Choose target monitor in Settings
- Auto-detect based on cursor position
- DPI-aware window management
Window Management
- Window bounds clamping for mixed-DPI setups
- Prevents size inflation across monitors
- Remembers position per monitor
Recent History
Recent Files
CyberViewer remembers recently opened items:
- Last 8 files/folders
- Access via File → Recent
- Clear history option
Favorites
Mark images as favorites:
- Right-click → Add to favorites
- Filter to show only favorites
- Quick access to preferred images