rhwp - HWP Document Viewer & Editor

Open and edit HWP/HWPX files directly in your browser. No installation, no ads, free.

rhwp is a free and open-source extension that lets you open, edit, and print HWP/HWPX documents directly in your browser. No separate software installation required. Key Features: Auto-open HWP/HWPX files in the viewer when downloading from the web Document editing: text input/modification, table editing, formatting Printing: Ctrl+P for print preview, save as PDF or send to printer Save edited documents as HWP files Open files via drag & drop Auto-detect HWP links on web pages and display an icon (badge) Document info preview card on mouse hover Right-click menu: "Open with rhwp" ⚠️ Important Notice: Direct HWPX save is currently disabled (beta). You can view and edit HWPX files but cannot save them yet — full support is coming in the next update. (HWP file save works normally.) Please back up important HWPX documents before editing. Privacy: All processing happens in the browser via WebAssembly (WASM) Files are never sent to any external server No ads, no tracking, no sign-up required We do not collect any personal information Web Developer Support: HWP link integration via the data-hwp-* protocol Built-in developer tools (rhwpDev) for debugging Developer guide provided Recommended for: Citizens viewing government and public-sector documents Parents checking school newsletters Office workers reviewing contracts and reports macOS/Linux users without Hancom Office Anyone who does not want to install separate software just to open HWP files MIT licensed — free for personal and commercial use. [v0.2.2 Changes — 2026-05-01] ■ v0.2.2 (2026-05-01) Highlights This update bumps the library core from v0.7.3 → v0.7.9 (4 cycles combined). Includes typesetting/rendering fixes from many external contributors and maintainer regression fixes. [Typesetting / Rendering] • Multi-column section accumulation formula fix — branched by single/multi-column, suppresses trailing line_spacing inflation (external contribution by @planet6897, PR #391) • Multi-column right-column single-line paragraph line spacing fix (external contribution by @planet6897, PR #424) • Table page split: row-unit split allowed for large rowspans — Hancom-compatible (external contribution by @planet6897, PR #401) • Inline image pagination fix in the same paragraph — fixed second image being drawn at the same y-coordinate (external contribution by @planet6897, PR #406) • heading-orphan vpos-based 5-condition guard — heading is now placed together with the subsequent table (external contribution by @planet6897, PR #408) • Image auto-crop (FitToSize+crop) formula fix + cell-internal image clamp (external contribution by @planet6897 + maintainer follow-up) • Hancom-defensive-logic mimic guard for the case where cell padding exceeds cell.height — fixes missing cell text and cell-entry failure (mel-001 personnel-table regression) [Equation Rendering] • Inline equation height set based on HWP authoritative value with simultaneous X/Y scaling (external contribution by @oksure, PR #396) • Separated ATOP / OVER semantics + AST parsing (external contribution by @cskwork, PR #397 — first external contributor to this repository) • Equation tokenizer font-style keyword prefix split + renderer italic honor (external contribution by @planet6897) • Alignment applied to empty-text + TAC equation cells — fixed left-anchored equations (external contribution by @planet6897) • HWPX equation serialization preservation (external contribution by @cskwork, PR #400) [Images / Shapes] • Picture+Square wrap host paragraph text now respects LINE_SEG cs/sw to avoid overlapping the image area (external contribution by @planet6897) • Picture serialization within group implemented — fixes data loss for group-pictures when saving HWP (external contribution by @oksure, PR #428) • HWP image effects (brightness/contrast) reflected in SVG (external contribution by @oksure, PR #395) • wrap=Square table paragraph margin reflected in x coordinate (external contribution by @planet6897) [Footnotes / Pagination] • Footnote multi-paragraph line_spacing alignment (external contribution by @planet6897) • PartialParagraph inline Shape page routing fix (external contribution by @planet6897) • TypesetEngine pagination fit accumulation drift fix (maintainer regression fix) [API · Tooling] • Public Paragraph char_idx conversion method exposed — supports Python/Node bindings (external contribution by @DanMeon, PR #494) • PageLayerTree generation API introduced — common foundation for multiple renderer backends (external contribution by @seo-rii, PR #419) • Canvas visual diff regression verification infrastructure — legacy Canvas ↔ PageLayerTree replay automated pixel diff (external contribution by @seo-rii, PR #498) • rhwp-studio PWA support — offline usage available (external contribution by @dyjung150605, PR #413) • editor.exportHwp() API added (external contribution by @ggoban, PR #411) [Web Page Integration] • Better URL handling for some Korean government download flows — fixes cases where the viewer could not fetch the file directly [Known Limitations] • Direct HWPX save is in beta and disabled for now (until the HWPX→HWP full converter lands) • If the print preview window appears too large, press Ctrl+0 to reset zoom [Thanks to Contributors] @cskwork — first external contributor to this repository (PR #397, #400) @DanMeon (PR #405, #494) @dyjung150605 — first-time contributor (PR #413) @ggoban — first-time contributor (PR #411) @oksure (PR #395, #396, #427, #428) @planet6897 (PR #391, #401, #406, #408, #410, #415, #424, #434, #478) @seo-rii (PR #419, #498) ■ v0.2.1 (previous) Library v0.7.3 — multiple external contributors + maintainer regression fixes consolidated. Hotfix for the v0.2.0 cycle's missing version sync in dev-tools-inject.js / content-script.js. [Full Changelog] https://github.com/edwardkim/rhwp/releases [Source Code] https://github.com/edwardkim/rhwp