What Is an RTF File?

Long before DOCX became the office standard, before PDF was everywhere, and when exchanging a formatted Word document between a Windows PC and a Mac was a genuine gamble, there was RTF. The Rich Text Format solved a real problem for its era and left a legacy that quietly persists to this day — even if most users have no idea it’s still running behind the scenes.

A Brief History: The Cross-Platform Exchange Standard

Microsoft invented RTF in 1987, initially as an internal format for transferring documents between different word processors. In 1992, Microsoft published the RTF specification openly, allowing any developer to implement it without licensing fees. That decision was consequential: throughout the 1990s and early 2000s, RTF became the de facto lingua franca of document exchange across different operating systems and applications.

If you needed to send a formatted document from Word on Windows to a colleague running Word on a Mac — or to someone using WordPerfect, or a Linux word processor — saving as RTF was the safest bet. It preserved bold, italic, font sizes, paragraph alignment, and basic tables, and virtually every text application could read it correctly.

Microsoft continued updating the RTF specification through version 1.9.1, then stopped in 2008. The format has been effectively frozen since then.

How RTF Works: Plain Text with Control Words

RTF has an unusual technical characteristic: it is a plain text format. Unlike DOCX (which is a binary ZIP archive) or the old DOC (which was a binary blob), an RTF file is human-readable text. It uses “control words” — keywords preceded by a backslash — to describe formatting instructions.

If you open an RTF file in Notepad, you’ll see something like:

{rtf1ansideff0
{fonttbl{f0 Times New Roman;}}
f0fs24 This is b boldb0  text.
}

Here, b starts bold formatting and b0 ends it. fs24 sets the font size to 24 half-points (12pt). This design made RTF relatively easy for different applications to implement — you don’t need a binary parser, just a text parser with knowledge of the control word vocabulary.

RTF vs DOCX: Key Differences

• Feature richness: DOCX supports a far wider range of capabilities — style inheritance, complex tables, tracked changes, document themes, SmartArt, and macros. RTF covers basic character formatting, paragraph formatting, and simple tables, but its feature ceiling is much lower.
• File size: RTF is uncompressed plain text, which makes it larger than equivalent DOCX files. The ZIP compression in DOCX typically saves 30–50% compared to the same content in RTF.
• Image handling: RTF can embed images, but stores them as hexadecimal-encoded data inline in the text stream. This is technically valid but produces very large files — an embedded 100 KB image might add 200+ KB to the RTF file due to the hex encoding overhead.
• Standardization: OOXML (the foundation of DOCX) is an ISO/IEC international standard. RTF was openly documented but never passed through a formal standards body, and Microsoft stopped maintaining the specification in 2008.

Where RTF Still Appears Today

RTF usage has dropped dramatically, but the format hasn’t disappeared entirely:

• The clipboard you never see: When you copy formatted text from Word and paste it into another application, many operating systems use RTF as the behind-the-scenes “rich text clipboard” format. You’ve probably used RTF thousands of times without knowing it.
• Legacy legal and academic systems: Some older case management software and academic journal submission portals accept RTF because it’s easier to parse than DOCX and retains more structure than plain text.
• Security-conscious exchange: RTF files cannot contain VBA macros in the way DOC files can, making them a occasionally preferred alternative when recipients are wary of macro-enabled documents. (Though RTF can contain OLE objects, which carry their own risks.)
• macOS TextEdit: Apple’s built-in text editor saves documents as RTF by default. Many Mac users have accumulated RTF files without realizing it — TextEdit’s interface doesn’t prominently advertise the format.
• Publishing workflows: Some desktop publishing applications (early versions of InDesign, certain book production tools) use RTF as an intermediate import format for flowing text from a word processor into a layout application.

How to Open RTF Files

RTF support is nearly universal across operating systems:

• Windows: WordPad (built in, native RTF support), Microsoft Word, LibreOffice Writer
• macOS: TextEdit (native), Pages, LibreOffice Writer, Microsoft Word for Mac
• Linux: LibreOffice Writer, AbiWord
• Online: Google Docs can open RTF files uploaded to Google Drive

Should You Use RTF Today?

Honestly, there are very few situations where RTF is the right choice for new documents in the 2020s. For editable formatted documents, DOCX offers better compatibility, more features, and an actively maintained standard. For fixed-layout distribution, PDF is the correct tool. For pure text, a .txt file is lighter and simpler.

RTF’s modern value is primarily in two scenarios: reading old files that were created in RTF, and interfacing with legacy systems that specifically require RTF input. If you have RTF files that need to be converted, or need to produce RTF output for a system that demands it, a conversion tool makes the process quick and painless.

Do it in your browser — the file never leaves your device: PDF Tools