Check that the source is a table
Open the original DOCX and select a cell. If Word provides table-layout controls, there is likely a real table to extract. A screenshot of a table is only an image, and aligned text separated by spaces is not a table. Save old DOC files as DOCX in the original application; renaming the extension does not change the format.
Resolve ambiguous structure first
Make a working copy and unmerge cells before conversion. Nested tables and rows that start in different grid columns need restructuring into a simple rectangle. Accept or reject tracked changes yourself, resolve fields, and remove hidden text from the working copy where appropriate. Do not discard meaningful notes simply to force a conversion to pass.
Review each output sheet
Every accepted table becomes its own worksheet in source order. The website previews only the first 30 rows and 10 columns of the first table, so inspect the complete downloaded workbook as well. Check the table count, row count, column boundaries, blank cells and multiline notes. Body paragraphs outside tables are not included in the spreadsheet.
Choose numeric types deliberately
All extracted values are stored as text. This protects codes such as 00123, long account identifiers and strings beginning with an equals sign. It also means an amount will not necessarily participate in numeric calculations until you convert that column. Preserve identifier columns as text and check decimal conventions before changing amount or date columns.
Keep the source document
The workbook is a data working copy, not a complete Word archive. Images, page layout, headers, footers, comments and automatic numbering do not transfer. Download the result before leaving the tab; the site has no document history. Keep both files when surrounding explanatory text matters.