YHWP

YHWP 0.2.0

Free · HWP/HWPX Editor · AI Document Assistant

Opens without Hancom Office.
The HWP editor that AI fixes for you

YHWP opens, edits and saves HWP/HWPX documents and converts them to PDF — a free Korean (Hangul) document editor. In 0.2.0 we rebuilt almost everything, from the engine to the interface. Type "Fix the spelling" in the chat panel on the right and the AI reads the document and fixes it directly, and a document with a 50,000-cell table now opens in 94 s → 3.8 s.

✦AI Assistant☁ Claude · 🖥 Ollama

Fix the spelling

Paragraph 4: "sys tem." → "system."

− We plan to strengthen our customer support sys tem..

+ We plan to strengthen our customer support system.

✓ ApplyAlways auto-apply✕ Reject

Summarize documentSpellingPolishOfficial styleTo EnglishShorten

Free · No ads ✦ Claude · ChatGPT · Gemini · Ollama Installer · Portable Hancom-style ribbon · Document tabs Windows 10 / 11

A free HWP editor that works without Hancom Office

It's not just a viewer for HWP files you receive — it's an editor that lets you edit and save them and convert them to PDF. The ribbon menu, document tabs, status bar and even shortcuts like F7 (Page Setup) match Hancom Hangul, so Hancom Hangul users feel at home right away.

※ "Typical free HWP viewer" describes the usual case for view-only programs and varies by product.

AI Assistant — tell it what to do and your document gets fixed

Ctrl+Shift+J or [Tools › AI Assistant], or the AI button in the status bar below opens it. (In Hancom, Ctrl+J is Page Break, so we picked a key that doesn't conflict.) The AI reads the document and first shows the original text (red) and the changed text (green); nothing goes into the document until you click "Apply".

Select text and click — done. With no selection, it applies to the paragraph at the cursor.

Table creation and long-document summaries — with source page numbers

📊 Build a table with one sentence

✓"Create a quarterly budget execution plan table at the end of the document" — it builds and inserts the table itself.

✓It fills in only what is in the document (a total budget of 1.2 billion won), and leaves cells with no source blank instead of making things up.

✓It can also edit tables: fill cells, add or delete rows and columns.

📚 Summarize and ask about hundreds of pages

✓One "Summarize document" button summarizes the whole thing. Long documents are read in chunks and then combined.

✓Ask about the content and it answers with source page numbers like (p. 3), so you can check the original right away.

✓"Insert below cursor" puts the summary straight into the document.

Choose your AI — from on-device AI to Claude, ChatGPT and Gemini

Documents that must not leave your organization, such as company or government files, can be handled by AI running on your own PC with no internet; when you need fast answers, use cloud AI. Above the chat panel, the AI in use is always labeled "My PC" or "Cloud".

🛡️ Built for peace of mind

✓Shows a before/after comparison and asks before changing anything (can be turned off in settings, or set to "Always auto-apply")

✓Revert AI changes with a single Ctrl+Z or "Undo all"

✓If an error occurs mid-edit, the document automatically returns to its original state

✓API keys are stored in Windows Credential Manager

✓Cloud AI asks for consent to send documents on first use, and "Cloud"/"My PC" is always shown above the chat panel

Folder batch AI — dozens of documents at once

Choose a folder and a task, and the AI processes each document inside one by one and saves the results as a single report file (.md). Original documents are never touched, and if you stop midway, the results so far are saved.

●AI per-document summary 20261013.md

# AI Batch Report — Summary per Document

Result: 3 of 3 completed · AI: Claude

## Registration System for Overseas Direct-Purchase Agents Starts in July.hwp (5 pages)

One-line overview: The Korea Customs Service will launch a registration system for overseas direct-purchase agents on July 1, 2021; mail-order businesses whose purchase-agency goods totaled 1 billion won or more in the previous year must register.

- Who must register: total value of imported purchase-agency goods of 1 billion won or more in the previous year (pp. 2, 3)

- Grace period & penalties: grace period until June 30, 2022; failure to register is punishable by a fine of up to 20 million won (pp. 2, 4)

## Monthly Import/Export Status, May 2024 (Final).hwp (19 pages) …

Excerpt from an actual report — for each document, a one-line overview and key points with source page numbers.

Faster — big documents open dozens of times faster

We upgraded the document engine to the latest rhwp 0.8.7 and rewrote the large-table layout code ourselves. Shorter bars are faster (gray 0.1.x, blue 0.2.0).

Document tabs and a new design — as familiar as Hancom

※ Skin and accent color swatches are illustrations to aid understanding and may differ slightly from the actual colors.

New features

Fixed issues

Recommended for

Download — installer or portable version: which should you get?

# PowerShell
Get-FileHash .\YHWP-0.2.0-windows-x64-setup.exe -Algorithm SHA256
Get-FileHash .\YHWP-0.2.0-windows-x64.msi -Algorithm SHA256
Get-FileHash .\YHWP-0.2.0-windows-x64-portable.zip -Algorithm SHA256

# Expected values (0.2.0)
# YHWP-0.2.0-windows-x64-setup.exe
# e02f7627a637282c5129c32226ace5b63b983ab0ae62fd93c8d7809265c30d85
#
# YHWP-0.2.0-windows-x64.msi
# a332eb16e12113dd828ee2d3d7d272a7ae9e25f1e7576d958f934dfffd87a953
#
# YHWP-0.2.0-windows-x64-portable.zip
# 916db0431646683c7094701bb3ee78fc1b5108867da5d08e391b14e854d0bff8

Privacy and open source

It opens and saves documents mostly the same way Hancom Hangul does, but when converting HWPX to HWP, some documents may end up with a different page count due to differences in the two formats' layout rules. For important documents, keep a separate copy of the original while you work.

Frequently asked questions

Can I open and edit HWP files without Hancom Office?

Yes. YHWP is a free editor that opens and edits HWP 5.x and HWPX documents, saves them as HWP or HWPX and exports to PDF — no Hancom Office required. The ribbon menu, document tabs, status bar and shortcuts like F7 (Page Setup) match Hancom Hangul, so you can start right away.

Is YHWP really free?

Yes, the program is free and has no ads. To use cloud AI (Claude, ChatGPT, Gemini) you need an API key from each provider, and you pay that provider for what you use. On-device AI (Ollama, LM Studio) is completely free.

Can AI fix the spelling in HWP documents?

Yes. Type "Find and fix the spelling and spacing errors" into the AI Assistant (Ctrl+Shift+J) and it reads the whole document, finds what to fix, and first shows the text before (red) and after (green) the change. Changes go into the document only when you click "Apply", and "Undo all" or Ctrl+Z restores the original.

Which AI models can I use?

You can choose Ollama or LM Studio running on your PC, or Claude, ChatGPT (GPT), Gemini or an OpenAI-compatible server in the cloud. API keys are stored in Windows Credential Manager, and the settings window offers key sign-up links, model list loading and connection testing right there.

Does using AI send my documents outside my PC?

Not with on-device AI. Cloud AI asks for consent to send documents on first use and always shows whether it is "Cloud" or "My PC" above the chat panel. The AI Assistant connects nowhere until you turn it on and configure it yourself.

Can I summarize multiple HWP files or convert them to PDF at once?

Yes. Folder batch AI summarizes, extracts key info from or spell-checks each document in a folder and saves everything as one report (.md), without touching the originals. Folder batch conversion converts documents to PDF, HWPX or HWP all at once, processing as many in parallel as you have CPU cores.

Do large HWP documents open quickly?

In 0.2.0, a document with a 50,000-cell table went from 94 s to 3.8 s, and a 314-page report from 16.6 s to 4.1 s. App launch takes about 0.4 s and a new tab about 0.1 s. We confirmed on 1,680 documents that the rendering output is identical before and after the improvements.

What's the difference between the installer and the portable version?

The features are the same. The installer (.exe, or .msi for companies) lets you open HWP files by double-click and adds a Start menu entry; the portable version (.zip) only needs to be unzipped and YHWP.exe run, so you can carry it on USB, but it doesn't set up file associations. Both versions store settings in your PC's user folder.

Can I use it on Mac or Linux?

From 0.2.0, only Windows 10/11 64-bit is provided. We stopped shipping the macOS version because we couldn't fully test it on a real Mac. On Mac or Linux, please use the web viewer hwp.youngsam.net, which opens in your browser with no installation.

I was using an older version — how do I update?

Download the new installer and install it over the old one. If the desktop still shows the old icon after installing, that's the Windows icon cache; it changes after a reboot.

Do documents look exactly the same as in Hancom Hangul?

Most documents open and save identically. However, when converting HWPX to HWP, some documents may end up with a different page count due to differences in the two formats' layout rules.

Isn't on-device AI like Ollama slow?

Depending on your PC's specs, a single answer may take tens of seconds. We recommend cloud AI if you need fast answers and on-device AI if security matters.

I see a "Windows protected your PC" dialog — is it safe?

This notice appears because it's an independently developed program without a code-signing certificate. Click "More info" → "Run anyway". You can first check that the downloaded file's hash matches the SHA-256 values on this page.

Where can I report problems or request features?

Youngsam.net Community: please leave your feedback there, and we'll reflect it in the next version. The source code is public on GitHub (openr03/YHWP).

Hancom Office and Hangul (HWP) are trademarks of Hancom Inc.; Claude is a trademark of Anthropic, ChatGPT of OpenAI, and Gemini of Google. YHWP is not affiliated with these companies.