Step 1 / source
Choose the source
Drop one file here
Choose the local html table you want to turn into utf-8 csv table.
Checking publication status...LOCAL DATA CONVERTER / HTML TABLE TO CSV
HTML Table to CSV
Extract one flat HTML table as formula-protected UTF-8 CSV without rendering scripts, loading resources, or scraping a URL.
Processed in this browserOne local .html or .htm file up to 2 MB, at most 20 tables, and one selected rectangular table within 50,001 rows, 200 columns, 1,000,000 cells, and 20 MB output.
HTML - one flat table
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One local .html or .htm file up to 2 MB, at most 20 tables, and one selected rectangular table within 50,001 rows, 200 columns, 1,000,000 cells, and 20 MB output.
Plain-language method
How HTML Table to CSV works
Nirmion removes script and style blocks, selects one table from local source text, extracts readable th and td content, decodes entities, preserves simple line breaks, validates a rectangular shape, and quotes CSV-sensitive cells.
- 01Choose a valid source
Save or export the authorised page as an HTML file first. This tool does not fetch a URL or run the page.
- 02Review the conversion choices
Table 1 is the first table in source order. Formula protection is recommended for spreadsheet opening.
- 03Inspect the separate result
The result ends in _nirmion_tools.csv and contains cell text only, without links, images, styles, or interactive controls.
Useful when
Practical jobs this tool handles
- Recover a report table from a saved page.
- Move an authorised HTML export into a spreadsheet.
- Create a clean CSV from a static table fixture.
Before converting
Check the source and destination rules
- Confirm which table number contains the required data.
- Expand merged cells before conversion.
- Review links or images whose meaning may be lost.
Know the boundary
Know what the destination format cannot keep
Nested tables and merged cells using rowspan or colspan are rejected. The converter does not fetch live websites, preserve markup, or infer headers from visual styling.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
Does it download a website URL?
No. It processes only the local HTML file you select.
Are HTML entities decoded?
Yes. Common named and numeric entities become readable cell text.
What happens to links?
Only visible link text remains; destinations are not exported.