LOCAL FIRST · WEB & DESKTOP PDF EDITOR

Documents stay on
your device.

komopdf modifies real PDF objects inside your browser WebAssembly environment or offline desktop application. Transactions, font metrics, undo/redo logs, and encryption stay local. No document telemetry, no screenshot overlays.

CORE CAPABILITIES

Genuine PDF Structure Manipulation

Unlike web tools that render PDF pages into background images and layer HTML text boxes on top, komopdf parses and serializes real PDF syntax objects according to the PDF 1.7 / 2.0 specifications.

Direct Typography & Layout

Replace existing characters, apply typeface/weight variations, or insert multi-line paragraphs with automatic line wrapping and metrics.

Integrated with 6 font families (18 faces) including Noto Sans/Serif CJK SC, LXGW WenKai, and Liberation families. Supports TTC selection and custom TTF/CFF imports.

Page & Object Geometry

Rotate, reorder, duplicate, insert blank pages, or import pages from external PDF documents while preserving internal tags and links.

Transform vector elements and images with affine matrices. High-resolution raster images support alpha channels and non-destructive cropping.

Local QPDF Encryption

AES-256 document protection, password-based unlocking, and lossless structure linearization executed entirely client-side.

Powered by QPDF 12.4.1 compiled to WebAssembly for browser environments and native binaries for desktop. Passwords never touch the network.

komo Agent Assistance

Intelligent document assistance powered by Claude Agent SDK. Performs translation, tone adjustment, and structured table insertion.

Every agent proposal generates an immutable candidate diff. You preview and explicitly accept changes before any PDF bytes are altered.

Atomic Transaction Log

Unified 16-command ABI with full undo/redo stacks, crash recovery journals, and separate staged export confirmation.

A failed command never leaves half-written state. Unsaved document guards prevent accidental navigation or tab closure.

Multi-Platform Distribution

Available immediately in any standard modern web browser, with standalone Windows x64 and macOS packages in staging.

Desktop packages bundle all runtime dependencies, fonts, and OCR models for full offline functionality without cloud accounts.