OpenScreenShot

OpenScreenShot is an open-source Chrome extension designed for capturing and annotating web page screenshots with a focus on privacy and local processing. It enables users to take full-page, visible-area, or custom region screenshots directly within the browser, making it suitable for those who need detailed visual documentation or wish to highlight specific web content without relying on external services or uploads.

The extension offers three capture modes: full-page, which scrolls and stitches the entire web page into a seamless image with fixed headers composited once at the top; visible area, capturing only what is currently displayed; and region selection, allowing users to click and drag to define a specific area with live size readouts and fine-tuning via arrow keys or resize handles. Every screenshot opens in a built-in, full-screen annotation editor, where users can add rectangles, arrows, freehand pen strokes, text overlays, blur (pixelate) sensitive information, or crop the image. The editor provides style controls such as an 8-color palette, adjustable stroke widths, and a font size slider, with annotation styles remembered across sessions. Editing features include undo/redo history, selection and movement of annotations, as well as zoom and pan navigation for precise adjustments.

For exporting, OpenScreenShot supports PNG (lossless with transparency), JPEG (with configurable quality), WebP (compact and modern), and PDF output. The PDF export includes options for single-page, multi-page with 5mm overlap to avoid splitting content, and custom page sizes such as A4 or Letter. All processing occurs entirely within the user's browser, ensuring that no data is collected, uploaded, or transmitted to third parties. The extension operates under a privacy-first model, requiring only minimal permissions (activeTab and scripting) and explicitly avoiding analytics, telemetry, or third-party integrations.

OpenScreenShot is distributed under the MIT License and can be freely installed from the Chrome Web Store. Its open-source nature and commitment to local, private processing make it an appealing tool for users who prioritize privacy and control over their screenshot workflow.