A 400-page report, 180MB on disk, and someone needs it editable. Plenty of converters quietly fall over on files like this — timeouts, half-converted output, downloads that never finish.
A bit of prep makes the whole thing routine.
Compress first, convert second
Most of a large PDF's bulk is embedded images. Compress the PDF and you'll often cut 60–80% of the file size without visible quality loss. Smaller upload, faster conversion, smaller docx at the end. This single step solves more "my PDF won't convert" problems than anything else.
Split if the document is genuinely huge
If you've still got a 500-page monster after compression, split it into chunks — every 100 pages, or by chapter, or by section. Convert each chunk separately to Word, then either work with them as separate files or paste them into one master document in Word. Word handles a 500-page document fine; converters sometimes struggle with the whole thing at once.
Convert and verify
Drop the compressed PDF into Flint's PDF to Word converter. Larger files take longer — a 100MB PDF might take a minute or two. The page stays put while it works; no need to refresh.
Open the docx and skim the first, middle and last pages. If structure carried across (headings, tables, page numbers) you're good. If anything looks corrupted, redo just that section from a fresh chunk.
Why the docx is also large
A Word file with embedded images at original resolution can rival the PDF in size. Use Word's Compress Pictures (Picture Format tab) to bring it down — set target ppi to 150 for screen, 220 for print. Or if you don't actually need editable images, replace them with placeholders and link to the originals separately.
FAQ
Is there a file size limit?
Flint allows generous uploads, but networks are the real bottleneck. Compress first to keep things moving.
Will the conversion time out?
Rarely, on well-prepared files. If a 200MB raw scan times out, compress and try again — usually solves it.
Should I split before or after compressing?
Compress first to reduce overall size, then split if you still need to. Splitting before compressing means you compress each piece separately, which is slower.
Why is my docx the same size as the PDF?
Images dominate file size in both formats. Use Word's Compress Pictures to shrink without re-converting.
Big files need a tiny bit of prep. Compress, then convert to Word.