What is an ODT file, and how do you turn it into a PDF?
Three ways to open an .odt you were sent and turn it into a PDF, depending on the software you have
A newsletter from your child's school, a form from the local council, a draft from a volunteer group: the attachment is called notice.odt. You double-click it and Windows asks which app should open it, or your phone shows no preview at all. To make things worse, you have been asked to fill it in and send it back as a PDF.
Nothing is wrong with the file. ODT is the format that the free office suite LibreOffice (and its older sibling OpenOffice) uses for text documents; it plays the same role there that .docx plays for Microsoft Word. In other words, the person who wrote it was using LibreOffice rather than Word. This guide walks through three ways to open the document and get a PDF out of it, sorted by what is installed on your own device, and explains which one to pick when.
Why did it arrive as an .odt in the first place?
LibreOffice costs nothing and is open source, so schools, charities, local authorities and small offices that would rather not pay for licences often install it. Unless the user picks a different format when saving, the program writes its own. The sender usually has no idea; the file opens perfectly on their screen, so they assume it will on yours.
ODT also has three siblings from the same family. The last letter of the extension tells you what kind of document you are holding; the table shows what each one is and which converter on this site takes it to PDF.
| Extension | What it is | LibreOffice app | Microsoft Office equivalent |
|---|---|---|---|
| .odt | Text document: letter, assignment, notice | Writer | .docx (Word) |
| .ods | Spreadsheet: list, rota, budget | Calc | .xlsx (Excel) |
| .odp | Presentation: slides | Impress | .pptx (PowerPoint) |
| .odg | Drawing, poster | Draw | No direct equivalent |
Which route fits you: what is on your device?
One question decides the route: does this device have a program that understands .odt? If it does, that program produces the cleanest PDF, because it speaks the same language as the software that wrote the document. If nothing suitable is installed, and especially if you are on a phone, converting in the browser without installing anything is the shortest path; the price is that the page layout is rebuilt rather than copied.
Route 1: you have LibreOffice or OpenOffice, so export as PDF
Open the document in LibreOffice Writer. From the menu bar choose File, then the Export As submenu, then Export as PDF. A dialog full of options appears; leave everything as it is, click Export at the bottom, and choose the folder where the PDF should be saved. In older versions the same command sits directly in the File menu.
There is a quicker button too: the PDF icon on the standard toolbar is called Export Directly as PDF, and it skips the options dialog and only asks where to save. OpenOffice does the same job from the PDF export command in its File menu.
The advantage of this route is that the page is frozen exactly as the sender saw it: fonts, headers and footers, page numbers, footnotes and table borders all stay where they were. If the document is a form, an official letter or a notice where layout matters, and you have a computer where you can install LibreOffice, choose this route. The suite is free; download it only from the project's official website and avoid repackaged "download accelerator" copies.
Route 2: you have Microsoft Word
Current versions of Word can open .odt files. Right-click the file and select Word from the Open with menu. Once it is open, go to File > Save As (or Save a Copy), choose PDF in the Save as type list and save.
Microsoft's own help page is upfront about the catch: an .odt created in another program may not look exactly the same in Word. The usual slips are numbered lists that restart, table borders that change and page breaks that move by a line or two. Scroll through the whole document once before saving, and check in particular that the signature block or a table hasn't spilled onto the next page.
Route 3: no suitable program, or you are on your phone
On a phone, or on a work computer where you can't install software, you can use the ODT to PDF converter on this site. It opens the .odt package inside your browser and writes a readable PDF; the document never leaves your device. When the file is a form carrying your address or date of birth, that is not a minor detail.
To be honest, this tool is no substitute for Route 1. It typesets the document from scratch: the text flows onto the paper size you pick (Letter by default on the English pages, A4 if you are sending it to the UK or Europe), headers, footers and footnotes are left out, and every font is replaced by a single typeface. That suits a letter or an assignment where the words matter; it does not suit a form whose layout must survive untouched. In that case, export it from LibreOffice on a computer, or simply ask the sender for a PDF.
If you received an .ods spreadsheet or an .odp presentation instead, the same logic applies; the tools listed below include separate ODS and ODP converters for those two siblings.
If you have to fill it in and send it back
This is the most common case: an organisation emails you a blank .odt form and wants it back as a completed PDF. The order matters. Open the document in a program that can edit it (LibreOffice or Word), fill it in and save, and only then convert to PDF. Adding text to a document that is already a PDF is far more fiddly.
If all you have is a PDF and you need to change the wording, go the other way: the PDF to ODT tool moves the text, with its headings, into an editable Writer document. Be clear about what it carries, though: words, not page design. Tables are broken into lines and logos or signatures don't come across. It is ideal for correcting a short text, not for rebuilding a complex form.
One last warning: renaming the file from .odt to .pdf does not make it a PDF. The extension is only a label; the contents stay the same and the recipient gets a "file is damaged" message. The only way to change the format is to actually convert it, as described above.
Frequently asked questions
Is an ODT file a virus, or is it corrupted?
No. It won't open because nothing on your device recognises the format, so the operating system doesn't know what to do with it. Opened in LibreOffice, Word or the converter on this site, the content looks normal.
Do I have to pay for LibreOffice?
No, it is free and open source, with installers for Windows, Mac and Linux on the project's official site. That is exactly why so many organisations use it. When downloading, go to the project's own page rather than the ad-heavy download sites that appear in search results.
Should I send the organisation an ODT or a PDF?
Send a PDF unless they specifically ask for an editable file. A PDF looks the same on every device and the recipient can't change it by accident. If they want something editable, ask which program they use: an .odt for LibreOffice users, a .docx for Word users causes the fewest surprises.
Do I need an app to convert ODT to PDF on my phone?
No. Open the ODT to PDF page of this site in your browser and pick the file from your Downloads or Files folder. If the layout has to be preserved exactly, do the export on a computer with LibreOffice instead of on the phone.
Can I save my own document as a PDF straight away?
Yes. In LibreOffice, once you have finished writing, use File > Export As > Export as PDF to make a separate PDF copy, and keep the .odt original for later edits. That way the recipient gets a file that opens anywhere and you keep one you can still change.
Last updated: October 12, 2026