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Drop one DOC or two hundred. Batch conversion is not a paid feature here.
Convert DOC to DOCX
An old document archive has to be brought into a current Office or Google Docs workflow.
SafeConvert engineFreeNo sign-upBatch supported
Scans with no text layer are read with OCR, on your device. The first run downloads the recognition engine once, then works offline.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
DOC and DOCX are not the same picture in two wrappers.
The binary OLE compound file is rewritten as a ZIP of XML parts. The content is the same; the container becomes one that modern tools read natively and that survives partial corruption far better.
Worth knowing first
Macros do not come with it. DOCX is defined as macro-free by design, so any VBA in the original is dropped, and moving it across requires the .docm format instead. Silent macro loss is exactly what catches people converting old templates.
Questions
DOC to DOCX, answered
Will the formatting change?
Usually not visibly. Both formats describe the same Word object model, so this is a much cleaner conversion than going to or from PDF.
Why is the DOCX smaller?
It is a ZIP archive internally. The XML compresses well, where the old binary format had none.
How to convert DOC to DOCX
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Choose your settings
Word Document is lossless, so nothing is thrown away in the conversion.
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Download
Converted and deleted the moment it finishes. Never written to permanent storage.