How to Convert Old .doc Files to Modern .docx or PDF

Old Word documents end in .doc. Modern ones end in .docx. The transition happened with Word 2007 — anything from that point on saved as .docx by default; anything before saved as .doc. If you’ve got a folder of family history documents, old academic papers, legal records from the 90s, or any other archive of pre-2007 Word files, eventually you’ll want to bring them forward.

Here’s how.

The fastest way: open and re-save in Word or Google Docs

The simplest approach is also usually the best. Modern word processors can read .doc files natively and save in modern formats.

Microsoft Word (any version 2007+):

Open the .doc file
Word may show “Compatibility Mode” in the title bar — this is fine
File → Save As → choose Word Document (*.docx) format
Save

Google Docs (free, browser-based, no installation):

Sign in to Google Drive
Upload the .doc file
Right-click the uploaded file → Open with → Google Docs
File → Download → choose Microsoft Word (.docx) or PDF format

LibreOffice (free, desktop):

Open the .doc file
File → Save As → choose .docx or PDF
Save

All three preserve formatting cleanly for typical documents. Tables, fonts, images, page layout all survive.

When you don’t have Word, Google Docs, or LibreOffice

If you just have a .doc file and no software that opens it, plus you don’t want to install or sign up for anything — you have a few options.

Browser-based conversion: convert the .doc to PDF or .docx using a free web tool, then work with the modern format.

The catch: there isn’t a great built-in browser tool for .doc conversion (it’s a complex binary format that needs more processing than browser sandboxes typically allow). Most online .doc converters work by uploading to a server, processing there, and serving back the result.

For sensitive documents, this is a problem — your old files might contain personal, legal, or financial information you don’t want on someone else’s server.

Better option: install one of the three free tools above. LibreOffice is the most lightweight if you don’t have Word and don’t want a Google account. It opens .doc files perfectly and lets you save as anything modern.

What about .docx → .doc (going backward)?

Sometimes you need to send a .docx to someone with very old software that only reads .doc. To save as .doc:

Word: File → Save As → choose Word 97-2003 Document (*.doc)

Google Docs: File → Download → choose Microsoft Word 97-2003 (.doc)

LibreOffice: File → Save As → choose .doc format

The conversion is mostly lossless but a few features may not survive (newer formatting options, embedded SmartArt graphics, advanced equations). For typical documents, this is fine.

In 2026, the situation where someone genuinely can’t open .docx is rare. Almost any device made in the last 15 years handles .docx. If you’re considering saving as .doc for “compatibility,” double-check that it’s actually necessary.

The right modern format for archival

When converting old documents, think about what you’ll use them for:

Keep as .docx: if you might edit them again. Word, Google Docs, LibreOffice can all open .docx. Future-proof for the foreseeable future.

Convert to PDF: if they’re “done” and you just want to read or share them. PDF preserves formatting exactly forever. Use DOCX to PDF after converting .doc to .docx first.

Convert to plain text (.txt): if you want to preserve just the content with no formatting. Smallest files, most portable. Plain text from a 1990 document still reads fine today. Use DOCX to TXT after converting.

Convert to HTML: if the document is going on a website. Modern semantic HTML, clean structure. Use DOCX to HTML after converting.

For an archive of family history documents, my recommendation: convert to .docx (for future editability) AND save a PDF copy (for guaranteed long-term readability). Duplicate storage but maximum future-proofing.

What can go wrong

Common issues when converting old .doc files:

Font substitution: documents using fonts no longer installed on your system get rendered with substitutes. The result usually looks similar but spacing may shift.

Embedded objects breaking: old documents sometimes embed objects (Excel charts via OLE, equation editor formulas, clipart) that don’t survive cleanly. For documents heavily relying on these, expect some manual cleanup.

Macro warnings: .doc files can contain macros (small programs). Some macros from the 90s are malicious or simply outdated. Word will typically disable them on open with a security warning. Usually safe to leave them disabled.

Track changes residue: some old documents have track-change history from their creation. This survives the conversion. Use Word’s “Inspect Document” feature to find and remove this before sharing externally.

Page layout drift: very precise old layouts (tables aligned with manual spacing) may shift slightly when rendered in modern Word. Visually similar but not pixel-perfect.

For most documents (typed reports, letters, basic tables), conversion is clean. For documents heavy on legacy features, expect some hands-on cleanup afterward.

Batch converting many .doc files

If you’ve got 100+ .doc files to convert all at once:

LibreOffice command-line:

libreoffice --headless --convert-to docx *.doc

Converts every .doc in the current folder to .docx. Works on any OS where LibreOffice is installed.

Word + VBA macro (for the patient):

Word has a macro language that can batch-open .doc files and save them as .docx
Internet has plenty of pre-written macros for this

Online batch converters: some exist (CloudConvert, Zamzar) but require uploading every file to their server. Not recommended for sensitive content.

For a few dozen files, manual one-at-a-time conversion is fine. For hundreds, the command-line approach is much faster.

Other legacy Office formats

While you’re modernizing, you might also encounter:

.xls (old Excel) → use Excel, Google Sheets, or LibreOffice Calc to save as .xlsx

.ppt (old PowerPoint) → use PowerPoint, Google Slides, or LibreOffice Impress to save as .pptx

.wps (Microsoft Works documents from the 90s) → harder; only Microsoft Works can fully open these. LibreOffice has limited support. For old Works documents, the cleanest path is often: install an old Windows VM with Works → convert there.

.wpd (WordPerfect documents) → LibreOffice handles these.

RTF (Rich Text Format) → still supported in modern Word, Google Docs, LibreOffice. Open and re-save as .docx or PDF.

.txt, .md (plain text and Markdown) → still fully supported, no conversion needed.

What this guide assumes

The advice above assumes you have:

Physical access to the .doc files
A computer (or phone — though desktop is easier for batch operations)
The ability to install or use Word, Google Docs, or LibreOffice

If your situation is different — .doc files locked behind ancient software, corrupted files that can’t be opened, files on physical media that’s hard to read — those are separate problems requiring specialized recovery rather than format conversion.

Privacy for personal archives

When converting old documents:

Word, LibreOffice (local): conversion happens on your machine; no uploads
Google Docs: uploads happen to your own Google account; not third-party
Browser-based PDF tools (after the .doc → .docx step): run locally, no upload

The risky option is “free .doc to .docx converter” websites where you upload to an unknown service. Avoid these for any personally-sensitive content.

TL;DR

Open in Word, Google Docs, or LibreOffice → Save as .docx: simplest, reliable path
For archive purposes: save both .docx (editable) and PDF (locked) versions
Batch conversion: LibreOffice command-line handles many files at once
Going backward (.docx → .doc): same tools, opposite direction; rarely needed in 2026
After modernizing: DOCX to PDF, DOCX to TXT, DOCX to HTML all work in your browser
Avoid sketchy upload-based converters for sensitive content