Copy the URL below to share your drawing:

Paste the URL containing image data:

How to Use

• Drawing: Click and drag to draw. Select color and pen width before drawing. Drawing continues even when mouse leaves canvas area.
• Clear: Removes all content from canvas (requires confirmation).
• Fill: Fills entire canvas with selected color.
• Size: Change canvas dimensions (64-2048px). Drawing position is preserved during resize.
• Save PNG: Downloads canvas as PNG image file with timestamp.
• Import: Load image from URL. Paste exported URL or base64 data. No page reload - works entirely in memory.
• Export: Generate shareable URL with canvas data. Optional password protection with AES-256-GCM encryption.

Options

• Password protect: Encrypt exported image with password (AES-256-GCM). Password required to view.
• Auto-resize to fit: Scale canvas display to fill available screen space while maintaining aspect ratio. Canvas resolution stays the same.

URL Parameters

Parameter	Description	Example
w	Canvas width in pixels (64-2048)	?w=800
h	Canvas height in pixels (64-2048)	?h=600
pen	Pen width in pixels (1-32)	?pen=5
img	Encoded image data (base64)	?img=H4sI...
autofit	Enable auto-resize (1/true or 0/false)	?autofit=1

URL Examples

• ?w=1024&h=768 - Open with 1024×768 canvas
• ?pen=10 - Open with pen width set to 10 pixels
• ?autofit=1 - Open with auto-resize enabled
• ?w=800&h=600&pen=5&autofit=true - Custom size, pen width, and auto-resize
• ?img=H4sI... - Open with exported image data
• ?w=640&h=480&pen=3&img=...&autofit=1 - All parameters combined

Technical Features

• Compression: RGB interleaving + RLE preprocessing + FLATE level 9 for minimal URL size
• Encryption: AES-256-GCM authenticated encryption with SHA-256 key derivation
• Position Preservation: Drawings maintain exact coordinates on export/import
• Efficient Encoding: 1-bit per color channel (binary), Base64 URL-safe encoding
• Touch Support: Full touch drawing support for mobile devices
• No Server Storage: All data in URL or local memory - no uploads
• Cross-Platform: Works on desktop, tablet, and mobile browsers

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