How to open HWP files on iPhone and Android
A .hwp attachment on a phone is more awkward than on a desktop: there is no native viewer on either iOS or Android, and installing Korean office software is not always an option. The browser route works on both, and the fiddly part is usually getting the file out of the email rather than converting it.
What your phone can and cannot do
Both platforms will show you the attachment and let you save or share it. Neither can render it.
- iOS — Quick Look previews PDFs, images, and Office documents. HWP is not supported, so tapping the attachment shows a file icon and nothing more.
- Android — behaviour varies by manufacturer and installed apps, but no stock Android build reads HWP either. Some Korean-market devices ship with viewers preinstalled; most devices sold elsewhere do not.
- Gmail, Outlook, and other mail apps — these preview attachments using the same system viewers, so they inherit the same limitation.
Converting it in the phone's browser
This is the practical route on both platforms, and it needs no app installed.
- Save the attachment to your phone. On iOS, tap the attachment, then the share icon, then Save to Files. On Android, tap the download icon in the mail app; the file lands in Downloads.
- Open this page in your mobile browser and tap the upload area.
- Pick the saved file — iOS opens the Files browser, Android opens the file picker. Navigate to where you saved it.
- Convert and download, usually as PDF, which every phone can then open natively.
Converting to PDF is generally the best choice on a phone: it opens in the built-in viewer, shares cleanly, and prints from the phone without further conversion.
The part that actually trips people up
Not the conversion — the file picker.
On iOS, if you tap the upload area and only see your photo library, look for the Browse or Files option in the picker. HWP files are documents, not media, so they will not appear under Photos.
On Android, the picker may open in Recent by default and show nothing relevant. Open the menu and choose Downloads, or whichever folder your mail app saved to.
If the file will not upload at all, check that saving actually completed. Mail apps sometimes hand over a placeholder before the download finishes, especially on a slow connection.
Reading it later on a computer instead
Sometimes the honest answer is to wait. A phone screen is a poor way to read a multi-page Korean government form, and if you need to fill anything in or print it, you will end up at a computer regardless.
If the document can wait, forward the email to yourself and handle it later — see opening HWP files on a Mac for the desktop options, which are broader.
Should you install a Korean office app?
If you deal with these documents regularly rather than once, a dedicated mobile app may be worth it. Hancom publishes mobile software, and availability, features, and pricing vary by region and change over time — check your platform's app store directly rather than relying on what any article, including this one, says is available today.
For a single attachment, installing an app to read one file is more effort than converting it in a browser tab.