Viewing

Viewing

CyberViewer provides lightning-fast image viewing with folder browsing, zoom, pan, and fullscreen modes.

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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

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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

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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

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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

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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

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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

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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