Orion
A PDF editor that stays on your computer, not in the cloud.
Orion is a desktop PDF editor that works entirely offline: open a document, add text, images, shapes and annotations, reorganize its pages — then save a normal PDF that any other reader can open. It isn't a wrapper around a web service: everything happens on your machine, and the original file stays untouched until you press Save.
Text added with the tool is real, selectable, searchable PDF text, not an image; annotations — highlights, underlines, sticky notes — are written as standard PDF annotations that any other reader understands. Pages are reordered by dragging thumbnails, split every N pages, or merged from several documents in an order you choose.
Behind the scenes, the interface never touches the PDF file directly: it edits an in-memory model, reading the file only to render it and writing it only on save — which is what makes undo cheap, crash recovery a simple serialization, and the original file safe. Distributed as standalone builds for Windows, macOS and Linux, under the AGPL v3 license, with a commercial license available for closed-product use.
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PlatformDesktop — Windows, macOS, Linux
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SavingAtomic, with automatic crash recovery
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FormatStandard PDF, readable by any other program
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LicenseAGPL v3 (commercial license available)
Orion was a giant hunter of Greek mythology, famous enough for his exploits to be placed among the stars as one of the night sky's most recognizable constellations. The name is borrowed here simply for its clarity — something large and easy to spot — rather than for any direct parallel with what the program does.
- Adds real, selectable and searchable text, images, shapes and arrows to any page
- Annotates with highlights, underlines, sticky notes and freehand drawing, written as standard PDF annotations
- Reorders, rotates, duplicates and deletes pages by dragging thumbnails
- Splits a document every N pages or merges several PDFs in an order you choose
- Unlimited, per-action undo and redo, even between two Orion windows
- Full-document text search with highlighted results
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