Filter a large CSV file that Excel will not open
A CSV export past a few hundred thousand rows turns Excel into a spinning cursor, and the part you actually need is usually a fraction of it. Filter it first, open the result.
The instruction to paste
Example instruction
Keep orders from March 2026 where Amount is over 500
What comes back
| Order ID | Date | Region | Amount |
|---|---|---|---|
| A-1001 | 2026-01-04 | EMEA | 1200 |
| A-1002 | 2026-02-17 | APAC | 340 |
| A-1003 | 2026-03-02 | EMEA | 890 |
| A-1004 | 2026-03-28 | AMER | 1500 |
| Order ID | Date | Region | Amount |
|---|---|---|---|
| A-1003 | 2026-03-02 | EMEA | 890 |
| A-1004 | 2026-03-28 | AMER | 1500 |
How it works
- 01
Upload the file — .xlsx, .xls or .csv, up to 100 MB.
- 02
Paste the instruction, changing the column names to the ones in your own file.
- 03
Download the result. Whatever was cut comes back on a separate tab, so nothing is lost.
Other ways to ask
The instruction is read as a sentence, not filled into a form. These all work on the same file.
Keep rows where Date is between 2026-01-01 and 2026-03-31, and keep only the Order ID, Date and Amount columns
Keep the 1000 rows with the largest Amount
The rows and values in your file are never sent to an AI model — only the column headers and your instruction ever leave our servers.
Questions
How large a file can I upload?
Up to 100 MB. Above that the upload is refused before anything is stored, so an oversized file costs you nothing.
Does the row count matter as well as the size?
Size is the limit that is enforced. A narrow file of a few columns fits far more rows into the same megabytes than a wide one.
What comes back, a CSV or a workbook?
An .xlsx workbook, so the rows that were cut can travel on their own tab.
Related tasks
See everything you can ask forTry it on your own file
Create an account, upload your spreadsheet and paste the instruction above.