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Common Document File Formats Explained

Not all "documents" are created equal — different file formats suit different purposes. Here’s a rundown of the most common ones.

DOCX (and the older DOC)

The format used by Microsoft Word, supporting complex formatting, images, tables, comments, and tracked changes. It’s well suited to documents that need repeated editing and collaboration, but formatting can shift slightly when opened on a device without the matching software or fonts installed.

PDF (Portable Document Format)

Designed to look exactly the same on any device or system, PDF is the go-to for formal documents, contracts, résumés, and print-ready files — anywhere "what you see is what you get" matters. Editing PDF content directly is usually far less convenient than editing a DOCX, though, so it’s best treated as a final, distribution-ready format rather than a working draft.

TXT (plain text)

Contains nothing but raw text — no fonts, colors, images, or any other formatting. Files are tiny and open natively on nearly any device or software, making TXT a good fit for code, configuration files, or plain notes where formatting doesn’t matter.

RTF (Rich Text Format)

A middle ground between plain text and DOCX, supporting basic formatting like bold, italics, fonts, and color, while being more broadly compatible than DOCX. It was commonly used as a cross-compatible intermediate format between different word processors in earlier years.

ODT (OpenDocument Text)

An open-standard document format commonly used by open-source office suites like OpenOffice and LibreOffice. It offers functionality similar to DOCX — formatting, tables, and images — but software that only supports Microsoft formats by default may need to convert it first for it to display correctly.

Choosing the right format for the job

If a document still needs repeated editing by multiple people, a format that supports styling and comments, like DOCX or ODT, makes more sense. If the document is finished and just needs to be displayed or archived, converting to PDF avoids layout shifts caused by differences in software or fonts. If the content is plain text with no formatting needs at all, TXT is the lightest, most universally compatible choice.

Common pitfalls when converting between formats

Converting DOCX to PDF is generally reliable and preserves layout well. Going the other way — turning a PDF back into an editable DOCX — is much trickier, since PDF is built around "final appearance" rather than "editable structure," and misaligned text or broken tables are common results, especially for documents with complex layouts.

Frequently Asked Questions

Why is PDF usually recommended over DOCX for sending official documents?

Because PDF renders essentially the same way across different devices, operating systems, and even different versions of software, without the layout breaking just because the recipient’s computer is missing a font or running a different version of a word processor — which makes it a safer choice for a finished file you’re sending to someone else.

Is TXT a good choice for saving important formal documents?

Generally not. TXT is extremely compatible and will open almost anywhere, but it doesn’t support any formatting, images, or tables at all. It’s better suited to code, notes, or simple records — formal documents usually still need a format like DOCX or PDF that supports proper formatting.