An ODT file is a text document in the OpenDocument Text format — the default "Save" format of LibreOffice Writer, much like DOCX is for Microsoft Word. You can open it without installing anything special: Word, Google Docs and the Mac's TextEdit all read it. This guide explains what's inside an .odt, who uses the format and why, and how to open one on Windows, Mac, Linux, iPhone and Android.
What Is an ODT File?
ODT stands for OpenDocument Text. It belongs to the OpenDocument Format (ODF) family, an open standard maintained by the OASIS consortium and published as the international standard ISO/IEC 26300. Nobody owns it and nobody charges for implementing it, which is why so many programs can read and write it.
The family shares one design across document types:
| Extension | What it holds | Microsoft Office counterpart |
|---|---|---|
| .odt | Text document | .docx |
| .ods | Spreadsheet | .xlsx |
| .odp | Presentation | .pptx |
| .odg | Drawing | — |
| .ott | Text document template | .dotx |
If someone sends you an .odt, they almost certainly wrote it in LibreOffice or OpenOffice Writer or saved it deliberately in an open format. There's nothing unusual about the file itself.
What's Inside an ODT File
An ODT is a ZIP archive with a fixed set of files inside. We unzipped a two-page test document to show what that looks like:
| File in the archive | What it stores |
|---|---|
| mimetype | One line naming the format: application/vnd.oasis.opendocument.text |
| content.xml | The text, tables, lists and notes |
| styles.xml | Paragraph, character and page styles |
| meta.xml | Author, dates, word and page counts |
| settings.xml | View settings such as zoom and cursor position |
| Pictures/ | Every embedded image, in its original format |
| Thumbnails/thumbnail.png | A preview of the first page for file browsers |
| META-INF/manifest.xml | A list of everything in the archive |
Two practical consequences:
- You can pull the images out without any office program. Copy the file, rename the copy from .odt to .zip, open it, and the Pictures folder holds every image at full resolution
- A damaged ODT is often partly recoverable, because the text lives in plain XML. Open content.xml in any text editor and the words are there, wrapped in tags
There's also a rarer single-file variant, .fodt (Flat ODT), which stores the same XML without the ZIP wrapper. It's used by people who keep documents in version control.
ODT Versions
The format has been revised several times, and newer programs read all earlier versions:
- ODF 1.0 — approved by OASIS in 2005 and published as ISO/IEC 26300 in 2006
- ODF 1.1 — accessibility improvements
- ODF 1.2 — added formulas for spreadsheets and digital signatures; later adopted as the current ISO edition
- ODF 1.3 — adds document encryption with OpenPGP keys, among other changes
You rarely need to care which version a file uses. It matters only when an old program refuses a newer file, and the fix is the same either way: open it in a current version of Writer, Word or Google Docs.
Who Uses ODT and Why
People on LibreOffice and OpenOffice. Writer saves ODT unless you change the default, so anyone using it — students on school laptops, Linux users, small organisations avoiding licence costs — sends ODT files without thinking about it.
Public bodies with open-format policies. Several governments have adopted ODF for exchanging documents. The UK Cabinet Office, for example, chose ODF in 2014 as the standard for sharing and collaborating on government documents. If a public agency sends you an .odt, that policy is usually why.
Archivists. An ISO standard with a public specification can be read decades from now even if today's software disappears. That's the main reason archives accept or prefer ODF.
Nobody is forcing you to use it. For everyday work, the "best" format is whichever one the people you exchange files with can open without friction.
How to Open an ODT File on Windows
- Microsoft Word — File → Open, then pick the file. If it isn't listed, switch the file type filter to "All files" or "OpenDocument Text". When you save, Word asks whether to keep the ODT format or switch to Word's own
- Writer — the format's native program, free for Windows, and the most faithful way to view and edit an ODT
- WordPad — opened ODT on older Windows versions with basic formatting only. Microsoft removed WordPad from Windows 11 starting with version 24H2, so don't count on it
- Google Docs — upload to Google Drive and choose Open with → Google Docs; nothing to install
If double-clicking an .odt does nothing, Windows simply has no program assigned. Right-click → Open with → choose Word, then tick "Always use this app".
How to Open an ODT File on Mac
- TextEdit — built into macOS and opens .odt directly. It shows text, basic formatting and simple tables; complex layouts and images may not display fully
- Writer for macOS — full fidelity, free
- Microsoft Word for Mac — if you have it, try File → Open; results depend on your Word version
- Google Docs — in any browser, via Google Drive
For a quick look, TextEdit is usually enough. For editing a formatted document, use Writer or convert the file.
How to Open an ODT File on Linux and Chromebook
Most desktop Linux distributions ship Writer preinstalled, so an .odt opens on double-click. Other editors such as AbiWord and Calligra Words read the format too.
On a Chromebook, upload the file to Google Drive and open it with Google Docs. You can edit it there and download it back as .odt or .docx from the File → Download menu.
How to Open an ODT File on iPhone and Android
Phones are where ODT is least welcome. The Files app on iPhone and most Android file managers won't edit it. Your options:
- Collabora Office — a free app for iOS and Android built on the same code base as Writer; it opens and edits ODT
- Google Drive — upload the file, then open it with Google Docs
- Convert it — if you only need to read the document, ODT to PDF gives you a file every phone opens, with the layout intact
ODT vs DOCX at a Glance
| ODT | DOCX | |
|---|---|---|
| Standard | ODF, ISO/IEC 26300 | Office Open XML, ISO/IEC 29500 |
| Native program | Writer | Microsoft Word |
| Structure | XML files in a ZIP | XML files in a ZIP |
| Opens in Word | Yes, via File → Open | Yes, natively |
| Opens in Writer | Yes, natively | Yes |
| Macros | Can contain Basic macros | Not in .docx; macro files use .docm |
| Typical sender | Free-suite users, public bodies | Almost everyone else |
The formats cover the same everyday features — styles, tables, images, footnotes, comments, tracked changes — and differ mostly in how they store them. For a closer look at the Word side, see our DOCX format guide; for how both compare with PDF and RTF, the document format comparison and RTF vs DOCX guides go further.
When to Save as ODT (and When Not To)
Save as ODT when:
- You work in Writer and the file stays with you or other Writer users
- A public body or archive asks for ODF
- You want a format whose specification is public and doesn't depend on one vendor
Save as DOCX when:
- The file goes to people who use Word, or to an upload form that lists .docx
- You rely on features that exist only in Word, such as VBA macros or content controls
Writer can save DOCX directly, and you can make DOCX the default in its Load/Save settings. That avoids converting each file later.
Converting ODT Files
If opening the file isn't enough, convert it to what the recipient expects:
- ODT to DOCX — for Word users who need to edit it
- ODT to PDF — for anyone who only needs to read or print it
- ODT to RTF — for very old word processors
- ODT to TXT — just the text, no formatting
- DOCX to ODT — the other direction, from Word to OpenDocument
Each of these takes several files at once and lets you download all the results as a ZIP. The full list lives on the ODT tools page.
Is an ODT File Safe to Open?
An ODT is as safe as a DOCX. The format can carry macros written in Basic, but Writer blocks or asks before running them, depending on its macro security setting, and Word doesn't run ODT macros at all. As with any attachment, if you weren't expecting the file, check with the sender before enabling anything.
Summary
An ODT is an ordinary text document in an open, ISO-standard format — the ODF equivalent of a DOCX. Word, Google Docs, TextEdit and Writer all open it; on a phone, Collabora Office or a PDF copy is the easy route. When the recipient needs Word or PDF, the ODT tools handle the conversion.
Related Tools
- ODT to DOCX — OpenDocument Text to Word
- ODT to PDF — a copy anyone can open
- DOCX to ODT — Word to OpenDocument Text
- All ODT tools — every OpenDocument Text conversion