A lightweight, fully offline PDF tool for personal use. Built because I hate using Adobe tools and wanted something snappier and lightweight. All PDF processing happens locally in the app; files never leave your machine.

Screenshots

Drag to reorder pages
Add & edit text	Draw & place signatures

Features

• Open & view — open PDFs (button or drag-drop), every page as a crisp thumbnail, click any page for a large viewer with an Enhance contrast toggle for faint scans; scroll or pinch to zoom (drag to pan)
• Page management — drag-to-reorder (single page or a whole multi-select block), rotate, delete, insert blank or duplicate pages; box-select with a marquee, or click + Ctrl-click; a thumbnail-size slider
• Page groups — tag pages with color groups (an organizing aid that never changes the saved file): select, rename, gather, or move a group as a block, and export each group as its own PDF
• Merge / Split / Extract / Compress — combine multiple PDFs (open or drag several), extract selected pages to a new PDF, split into a folder of files, or compress (re-encode pages) to shrink scans
• Find — Ctrl+F to search text across all pages with on-page highlights (works on text PDFs and on OCR'd scans)
• OCR — recognize text in scans (offline, bundled Tesseract) and save a copy with an invisible, selectable/searchable text layer
• Markup & annotation — highlight / underline / strikethrough, freehand pen, lines / arrows / boxes, and colour sticky-note comments; all baked into the saved PDF
• Text & forms — stamp text anywhere + auto-detect & fill real AcroForm fields (text, checkbox, radio, dropdown), flattened on save
• Signatures — draw (with a trackpad glide mode) / upload / reusable saved library; place, drag, resize; baked in on save
• Images — insert PNG/JPG as pages; export selected pages as PNG (2×, overlays baked in)
• Polish — save-in-place (Ctrl+S overwrites the open file) + recent-files list, automatic updates from GitHub Releases, .pdf file association (double-click to open, single-instance), keyboard shortcuts (Ctrl+O/S, Ctrl+A, Delete, Esc), remembered window size, custom icon, logo-matched theme

Tech stack

Layer	Choice	Role
Shell	Tauri 2 (Rust)	Tiny native window, dialogs, file I/O
UI	React + Vite + TypeScript	App interface
Render	pdf.js (pdfjs-dist v6)	Page previews / thumbnails
Edit	pdf-lib	Merge, split, reorder, stamp, forms
Reorder	@dnd-kit	Drag-and-drop page grid (M2)
Signatures	signature_pad	Draw signatures (M5)

Architecture notes

• All editing runs in the webview (JavaScript). Rust only provides the native shell: read_file / write_file commands (efficient binary transfer) and the native open/save dialogs via tauri-plugin-dialog.
• pdf.js renders with a top-left origin (CSS px); pdf-lib writes with a bottom-left origin (PDF points). The coordinate transform between them is the key detail for text-stamping and signature placement (M4/M5).
• Native OS file-drop is disabled (dragDropEnabled: false) so HTML5 drag-and-drop works inside the webview.
• pdf.js v6 decodes JBIG2/JPEG2000 scans via WASM that it doesn't auto-locate — those assets are copied from node_modules/pdfjs-dist into public/pdfjs/ and pointed at via wasmUrl/iccUrl/standardFontDataUrl in src/lib/pdfjs.ts. (Re-copy them after upgrading pdfjs-dist.)
• Stamp/signature placement is converted to PDF coordinates with pdf.js's viewport.convertToPdfPoint, so it stays correct on pages with a /Rotate.
• The app icon is generated from src-tauri/app-icon.svg via npm run tauri icon.

Development

npm install
npm run tauri dev     # compile Rust + launch the desktop app (first run is slow)
npm run build         # type-check + build the frontend only
npm run tauri build   # produce a distributable installer

Requires Node.js and the Rust toolchain