How to use CSV Viewer & Validator
Preview CSV tables and inspect parsing errors.
- Choose a CSV or TSV file. Review the detected delimiter, column names, row count, and any inconsistent field counts before exporting.
- Process the selected files, then inspect the preview, dimensions or warnings.
- Download a new copy and check it before replacing or sharing the original.
How processing works
The CSV parser reads the header row and delimited records, reports parsing or width issues, and shows a bounded preview without treating numeric-looking text as numbers.
A quick example
Inspect a semicolon-delimited export without opening a spreadsheet app.
Assumptions, edge cases & limits
- The preview is limited and is not the complete dataset.
- Duplicate headers must be renamed before processing; row-width warnings need review.
- A successful parse does not prove the data is complete or semantically correct.
Questions about CSV Viewer & Validator
Will opening a CSV remove leading zeros from IDs?
The parser keeps cell values as strings rather than automatically converting 00123 to a number. A spreadsheet may still apply its own type conversion when opening a later export.
Why do some CSV rows have a warning?
A row can contain too many or too few fields, malformed quoting or a delimiter issue. Compare the warning with the original row before relying on downstream merges or conversions.
Are my files or inputs uploaded?
Calculation and file processing run in your browser without a processing upload. Downloads go to your device. Choosing a next-step transfer creates a temporary local copy for that workflow. Region preferences are stored separately from tool inputs. See our privacy details.
Can I use this tool for free?
Yes. No signup, subscription or payment is required to use the tool or download its output. File tools have device and size limits; a smaller batch may work better on a phone.
A result or explanation needs correcting? Tell us the tool name and an example.