Default
Subscription
Claude subscription (Claude Code), ChatGPT plan
Nothing beyond your subscription fee. Use counts against the subscription's limit.
New version 0.12.12PDF to Hangul documents, FreeMind mind maps open→
From Hangul to PDF, in one window.
Open Hangul (HWP), Word, Excel, PowerPoint, PDF, EPUB, Markdown, HTML, mind map and diagram files in tabs, edit them, and save them in their original format. Anyone can use it for free.
Beta · Windows 10 and 11 (64-bit) · Mac (Apple Silicon · Intel) · Linux (x64 · deb, rpm) install guide
downloads in total Windows installs Mac installs Linux installs GitHub stars
Hangul
Hangul files
stay Hangul files.
Open and edit the documents people exchange as Hangul (HWP) files, such as official letters and application forms. When you are done, save them in the original format, turn them into a PDF, or print them right away.
- Saved in the original format
- A .hwp file is saved as .hwp, and a .hwpx file as .hwpx. The first time a file is overwritten, the original is kept as a .bak file. With Save As you can pick either format, or make a PDF copy.
- Opens again in Hancom Hangul
- While building it, we checked with hundreds of real Hangul documents that edited and saved files open in Hancom Hangul 2024.
- New documents and PDF
- Start a blank Hangul document from Home, and turn a finished one into a PDF or print it. In the PDF editor, choose "PDF Converter" → "PDF to HWP" to bring a PDF in as a Hangul document and edit it.
- Repetitive work goes to the AI panel
- You can ask it to fill table cells, add or remove rows and columns, fill in form fields, and add footnotes or a table of contents.
The Hangul editing screen is built with the open-source rhwp.
AI
Hand work to AI
only when you need to.
An AI panel sits beside the editor. You can use the office without it. When there is tedious work you would
rather hand off, such as filling a table or polishing sentences, ask, and the AI edits the open document with
the app's own editing tools. Save the requests you make often as skills, and call them up by typing
/ in the input box.
The conversation on screen is an example for illustration.
- You can undo it
- The AI shows what it changed, and if you don't like it, you undo it.
- New documents from your material
- It reads the files you choose and makes slides, an HTML page, or a mind map.
- Ask your own documents
- Pick files you starred on Home and ask a question; it reads those files and answers.
Cost
Using AI costs nothing extra.
IeumOffice gets its answers through the Claude or ChatGPT subscription you already have. Requests count against your subscription's usage limit, and you don't need to create an API key.
Without a subscription
Free AI
OpenRouter, Google Gemini
Nothing within the free limit. You connect it in Settings.
Only if you choose it
Pay as you go
API key, pay-as-you-go account
You pay that company for what you use.
When the subscription limit is used up, requests stop and the app tells you why. If it can tell when you can use it again, it says that too. It never switches to a paid connection by itself.
Privacy
No server, no account.
IeumOffice sends no usage statistics, and your documents are opened and saved on your PC. What leaves your PC is what you send to an AI company when you ask its AI for something.
Read the full privacy policy- It does not read, copy or store the sign-in data of Claude Code or Codex. If you connect ChatGPT directly in the app, it keeps on this PC only the one sign-in OpenAI issued to this app, and deletes it when you disconnect.
- It has no sign-in screen of its own. You sign in on that company's own page.
- It never starts an AI request in the background that you did not ask for.
- Claude Code and Codex run with every tool the app can turn off turned off, and they end when you close the app. The one exception is the agent window, which turns on a fixed set of tools only in a project folder you choose.
Developers
Coding agents work on the same documents.
The app includes the terminal command ieumoffice, an MCP server and an agent skill. Register them in
Settings → Integrations, and Claude Code, Codex and Cursor can read and edit the same files.
PS> ieumoffice docs read fall-book-fair-plan.docx
PS> ieumoffice sheet read book-fair-budget.xlsx
PS> ieumoffice open book-fair-talk.pptxOpen source
Built on
open source.
IeumOffice is itself open source, released under Apache-2.0. It was possible thanks to the projects below. Only the main projects are listed here; the license notices are in the repository's NOTICE file.
Overall
Hangul
- rhwpEngine that reads, writes and draws Hangul documents; editing screen · MIT
Word
- docxCreating Word files · MIT
Excel
- PDF.jsViewing PDF · Apache-2.0
- EmbedPDF PDFiumDrawing and editing PDF · MIT, BSD-3-Clause
- pdf-libCreating and saving PDF · MIT
- HarfBuzzText layout in translated PDFs · MIT
HTML
- MathLiveMath input · MIT
Mind map
- Mind ElixirMind map screen · MIT
Diagram
- draw.ioDiagram editing screen · Apache-2.0
Slides
- Pretendard and 9 moreTemplate fonts: Pretendard, Noto Serif KR, Gowun Batang, Gowun Dodum, Do Hyeon, Black Han Sans, Archivo Black, Bebas Neue, Playfair Display, Space Grotesk · SIL OFL 1.1
Logo
- Lucide, RobotoShape and lettering of the logo · ISC, Apache-2.0
Projects we learned from
We took no code from these; we studied their features and design.
- pdf-craft We compared feature sets while building PDF to Markdown and EPUB conversion.
- claw-hwp We studied its design of AI tools for Hangul documents.
- hwp-mcp We studied its Hangul automation design, such as how it points to table cells.
- frontend-slides We rebuilt the slide template designs based on this project (MIT).
- k-slide We studied its pairings of Korean fonts for templates.
If IeumOffice helps you, please star it on GitHub. Each star helps the next person find this program.
Install
Three steps to install.
-
Get the installer
Use the button below to get
IeumOffice-Setup.exe. It is for 64-bit Windows 10 and 11. -
If a warning appears
Because it is a new free program, Windows may show a warning. If you get stuck, pick the screen you see below. We'll show you where to click.
-
Connect an AI
In the first-run guide, connect your Claude or ChatGPT subscription. Without a subscription, connect a free AI. If you get stuck, see AI connection help.
Once installed, the app checks for a new version every 4 hours. The interface comes in 21 languages. If you like it, please star it on GitHub.
If something is awkward or missing after you try it, tell us through Send feedback.
Stuck while installing? Pick the screen you see.
On a Mac or Linux: Opening it the first time on a Mac · Installing on Linux