Kaptur

About

Kaptur is a browser extension for OSINT investigators and security researchers. It lets you capture screenshots of any web page, annotate them, and organize everything into investigation sessions — entirely in your browser, with no data ever leaving your device.

Capture
— Visible tab screenshot or freehand region selection
— HTML DOM saved alongside every screenshot
— Forensic banner burned into each image: ISO 8601 timestamp + full SHA-256 hash

Annotate
— Draw arrows, rectangles, text, highlights, blur zones and numbered markers directly on captures
— Full undo/redo, non-destructive (original always preserved)

Organize
— Group captures into named sessions (one per investigation, audit, or research thread)
— Tags, notes, domain and date filters
— Full-text search across names, URLs, page titles, notes and tags (Cmd/Ctrl+K)
— Advanced operators: session:, domain:, tag:, html:, media:

Export
— Single capture as PNG with customizable filename template
— Whole session as a ZIP archive
— Full database as a .kaptur backup file — importable to restore any state

Privacy
Kaptur makes zero outbound network requests. Everything is stored in your browser's IndexedDB under the extension's isolated origin. No analytics, no telemetry, no remote backend — ever.

Permissions are limited to what is strictly necessary: screenshots and HTML capture require activeTab and scripting; the region overlay requires host_permissions to inject on the active page.