Free · Browser-local tools
Validate a CSV file
Validate CSV syntax and optional required, type and allowed-value rules. Locate record and column errors in the editor and download the report.
Validate CSV
Start with your CSV
Open your file in the CSV editor with this tool already selected. Preview the result before downloading.
- Open or paste CSV and check its original syntax.
- Set an expected column count or optional required, type and allowed-value rules.
- Review logical record/column diagnostics, jump to cells and download the report.
Free · No signup · File contents stay in your browser. Back to page and Resume keep your edits in this tab. Download your edited copy before refreshing; refresh opens the original file. Open files up to 1 GiB with browser storage.
Try a small example
3 records · 3 columns| id | name | amount |
|---|---|---|
| 1 | Example one | 12 |
| 2 | Example two | 24 |
| 3 | Example three | 18 |
This sample has consistent columns and unique headers.
Optional rules can require a name or check that amount is numeric. The report identifies the affected record and column.
Illustrative fictional data. Open the sample to try the tool.
How to validate csv
- 1
Open or paste CSV and check its original syntax.
- 2
Set an expected column count or optional required, type and allowed-value rules.
- 3
Review logical record/column diagnostics, jump to cells and download the report.
What to expect
Original syntax checks and edited-table rules are distinct. Optional column rules check required values, supported types and allowed values. Record numbers are logical CSV records, not physical source lines.
Local files and clear limits
These tools process file contents on your device. The browser workspace accepts files up to 1 GiB and 5 million records, subject to available browser storage and decoded-record limits. This tool's calculations support up to 100,000 records, 2 million cells and 64 MB of text. Download a new copy to keep your result.
Plain answers
Validate CSV questions
What can I do with this validate csv tool?+
Original syntax checks and edited-table rules are distinct. Optional column rules check required values, supported types and allowed values. Record numbers are logical CSV records, not physical source lines.
Does my CSV leave my device?+
File selection, editing and these task operations run in your browser. No account or file upload is required. Download a new copy to keep your result; refreshing restores the original input, not unsaved edits.
Do the editor and task have the same file limits?+
The editor opens files up to 1 GiB and 5 million records, subject to browser storage and decoded-record limits. This task supports up to 100,000 records, 2 million cells and 64 MB of decoded text.