Open PDF Studio

Open PDF Studio is a free, open-source PDF editor and annotator built for professionals who need powerful tools without expensive subscriptions.

Features:

- 22+ annotation tools: highlight, underline, strikethrough, shapes, freehand drawing, text boxes, callouts, sticky notes, stamps, and images
- Signatures: draw, save, and reuse up to 5 signatures
- Measurement tools: distance, area, and perimeter with scale calibration
- Page management: insert, delete, extract, reorder, replace, and merge PDFs
- Watermarks and headers/footers with variables
- Redaction: mark and apply to permanently remove sensitive content
- Full print dialog with live preview, scaling, and page setup
- Form filling: AcroForms and XFA with JavaScript validation
- Edit existing PDF text
- Export pages as PNG, JPEG, or raster PDF
- Multi-tab editing with session restore
- 10 navigation panels: thumbnails, bookmarks, annotations, attachments, signatures, layers, form fields, destinations, links, and tags
- XFDF annotation import/export
- 5 themes: Dark, Light, Blue, High Contrast, System
- Undo/redo with up to 100 levels
- Built-in auto-updater
- No telemetry, no data collection, no subscriptions

Built with Tauri and web technologies for a fast, lightweight, native desktop experience.