Document format

DOC format guide

A .doc file is a Microsoft Word document in the binary format Word used from the late 1980s through Word 2003. Unlike its XML-based successor, a .doc stores text runs, formatting records, and embedded objects in a proprietary binary layout that only full office suites parse dependably.

Current availability

Format information only

Novus Convert does not currently process this format. No upload or download control is shown because the site never represents an unavailable conversion as working.

View available formats

Where DOC comes from

The .doc binary went through several incompatible revisions as Word evolved, settling into the OLE2 Compound File structure with Word 97. Microsoft kept the specification closed until 2008, when the MS-DOC documentation appeared under the Open Specification Promise — a year after Office 2007 had already replaced the format with DOCX.

How DOC works

Stored inside an OLE2 Compound File, essentially a miniature FAT-like filesystem with streams named WordDocument and 1Table.
Text lives in piece tables that map character runs to file offsets, a design optimized for fast incremental saves rather than easy parsing.
Formatting is encoded as binary property modifiers (SPRMs) layered over character and paragraph runs.
Embedded images and OLE objects are serialized into separate storages within the same compound file.
VBA macros can live in an adjacent project stream, which made .doc a favorite malware carrier.

When to use DOC

Reading decades of business and government archives written before 2007.
Exchanging files with organizations frozen on Word 97-2003 deployments.
Recovering content from old backups where only binary Word files survive.

Strengths and limitations

Strengths

Every version of Word since 97 — and every major office suite — still opens it.
An enormous historical corpus exists in it, so recovery tooling is mature.
Supported the full Word feature set of its era: styles, tables, fields, embedded objects.

Limitations

The binary layout is intricate enough that faithful parsing outside desktop office suites is rare; browser-local converters cannot handle it reliably, so this site documents .doc as a guide-only format.
Frozen since 2007 — new Word features never arrive in it.
Macro support makes it a common phishing payload, and many mail gateways quarantine it on sight.

Compatibility

Microsoft Word 97 through Microsoft 365 opens .doc, as do LibreOffice Writer, Apple Pages, and Google Docs (which converts on upload). Because a near-complete Word implementation is needed to interpret the binary, the practical route to converting one is resaving it as .docx in a desktop suite first.

Author, title, company, and editing statistics sit in the compound file's SummaryInformation streams — occasionally including revision history and the last ten authors, a well-known leak risk.