What is the difference between DOC and DOCX?

DOC is the binary Word format that dominated office computing from Word 97 through Word 2003, before OOXML and DOCX took over in 2007. The file is a Microsoft Compound File Binary container - the same OLE structure used by old XLS and PPT - holding text streams, formatting tables, and embedded objects in a notoriously fragile schema. Government agencies, family-court clerks, university registrars, and law firms with 20-year-old document archives still hand out DOC templates. Converting DOC to HEIC renders these legacy files as flat images in a modern, storage-efficient format that every current Apple device displays natively.

The format's quirks are legendary: hidden text, field codes, embedded macros, and AutoText entries can render unexpectedly depending on which version of Word last touched the file. A DOC created in Word 97, edited in Word 2010, and opened in LibreOffice 7 will often show different line breaks across all three. Flattening to an image locks in one rendering and prevents downstream reflow surprises. HEIC does that at roughly half the file size of JPG output - a meaningful saving when digitizing a filing cabinet's worth of legacy pages into iCloud or a photo-library-based archive.

Typical legacy DOC files run 20KB-500KB for text documents, occasionally ballooning past 10MB when scanned images were pasted inline (the binary format stores them inefficiently). HEIC output is one image per page, typically 100-250KB at 150 DPI. Be deliberate about the destination: HEIC pages are perfect for Apple Photos, Notes, and iMessage, but court e-filing systems and Windows-based recipients need JPG or PDF - pair with HEIC to JPG for those. For modern Word files use DOCX to HEIC instead.

Reasons to convert DOC to HEIC usually come down to compatibility, file-size, or specific feature requirements. Common situations:

• An app or platform only accepts HEIC uploads.
• You need a feature unique to HEIC (e.g. transparency, vector scaling, animation, multi-page pages, etc.) that DOC doesn't provide.
• You're optimising file size — modern formats often produce smaller files than the older format you started with.
• You need a single archival format across a project so files behave consistently in the same viewer.

1. Open the DOC → HEIC tool on heic.now.
2. Drag your DOC file onto the drop zone, or click Select files. You can drop a whole folder of files at once.
3. The output is fixed to HEIC. If the format supports extra options (page size, transparency background, quality, EXIF stripping), tweak them in the right-hand panel.
4. Click Convert. The job runs on our server and finishes in a few seconds for typical photos.
5. Download the result. Files stay in storage for 24 hours and are then permanently deleted.

The entire flow is free for the first 10 jobs per day with no signup required. A free account doubles that quota; a premium plan removes the limit entirely.

• Open the DOC in current Word or LibreOffice first to confirm it actually opens - badly corrupted DOC files from the 1990s sometimes need WordPad or Word's Open and Repair feature to extract content.
• If the DOC contains AutoText fields like {DATE} or {PAGE}, those resolve to today's date and current page numbers when rendered - update them before converting if you need the original values preserved.
• Legacy DOC files often contain hidden personal information in the Summary properties (author, manager, company) - check File - Properties before converting if privacy matters.
• For court exhibits or certified copies, HEIC is the wrong target - courts want PDF or JPG. Use HEIC for your own compact archive and convert selects to JPG for filing.
• Macros do not execute during conversion - if your DOC relies on a macro to populate content, run it in Word first, then save and convert the resulting file.