Claude Shredded 38% of My Invoice Tables — Send CSV Instead
Claude mangled line items on 38% of multi-page invoices when uploaded as PDF. Here's the 20-line Python pipeline that dropped row errors to 2.1% and reconciled VAT totals on 100% of 412 real supplier invoices.
Why direct PDF upload fails on tables, why markdown and image conversion don't fix it, and how a pdfplumber → CSV → Claude pipeline solves it for under twenty lines of code.
Chapters:
00:00 The 38% row-error problem
01:00 Why PDFs break Claude on tables
02:00 The pdfplumber + CSV pipeline
04:30 Edge cases: ragged rows, scans, totals
06:00 Results across 412 invoices
Resources:
Invoice automation builds: https://bizflowai.io
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