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CSV Cell Updater
Update selected CSV cells using explicit row and column coordinates.
CSV table, Coordinate edits JSON, Spreadsheet formula protection
updated.csv, csv-cell-updater.report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter values using the examples, or choose a local file where requested. Follow the displayed supported input shapes and limits.
- Choose Calculate result and inspect the complete result.
- Download result to save the primary file. Where supplied, additional links save source files and the full JSON report. Reset restores examples and clears output.
Examples
CSV table: Name,Count
Ada,3
Lin,4
Coordinate edits JSON: [{"row":2,"column":"Count","value":"5"}]
Spreadsheet formula protection: protect
Limitations
- Comma-separated strict CSV with unique nonempty headers. Edits use1-based data rows,exact header names and string values; reject duplicate coordinates,missing rows/columns,NUL or protection-induced header collisions. Preserve other parsed cells except default-on shared formula protection,which retains complete signed decimal/exponent spellings. At most2000 logical records including header,200 columns,100000 cells,2000 edits and100000 source units. Output fully quotes fields with CRLF; CSV cannot declare spreadsheet cell types.
- Text fields are limited to100,000 UTF16 units each and400,000 combined UTF8 bytes; file fields have their own displayed limits. Combined output is at most4MiB. Processing stops after30 seconds; tool-specific bounds may be tighter.
- Generated source is a downloadable result and is not executed here. Inspection does not establish remote behavior, trust or standards certification.
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