Truncate CSV Columns

What It Does

Shorten field values in your CSV columns to a maximum character length. Useful for enforcing field length limits required by databases, reducing data size, or creating preview versions of large text fields.

How It Works

Truncate CSV Columns applies a focused transformation to the input so you can compare the before and after without writing a custom script for a one-off task.

Unexpected output usually comes from one of three places: the wrong unit of transformation, hidden formatting in the source, or an option that changes the rule being applied.

All processing happens in your browser, so your input stays on your device during the transformation.

Common Use Cases

• Enforce VARCHAR length limits before database import
• Create preview columns by truncating descriptions to 100 characters
• Trim overly long comment fields in exported data
• Prepare data for fixed-width display in reports
• Reduce file size by capping the length of verbose text columns

How to Use

1. Paste your CSV data into the input.
2. Specify the maximum character length.
3. Choose which columns to truncate (all or specific ones).
4. Optionally add a suffix (like '...') to truncated values.
5. Click Truncate and copy the result.

Features

• Set maximum character length per column
• Optional truncation suffix (ellipsis, etc.)
• Apply to all columns or specific selections
• Preserves short values that are under the limit
• Handles multibyte characters correctly

Examples

Below is a representative input and output so you can see the transformation clearly.

name,age,city
Ada,36,London
Lin,29,Berlin

name,age,city
Ada,36,Lon
Lin,29,Ber

Edge Cases

• Very large inputs can still stress the browser, especially when the tool is working across many columns. Split huge jobs into smaller batches if the page becomes sluggish.
• Empty or whitespace-only input is technically valid but may produce unchanged output, which can look like a failure at first glance.
• If the output looks wrong, compare the exact input and option values first, because Truncate CSV Columns should be repeatable with the same settings.

Troubleshooting

• Unexpected output often means the input is being split or interpreted at the wrong unit. For Truncate CSV Columns, that unit is usually columns.
• If a previous run looked different, check for hidden whitespace, changed separators, or a setting that was toggled accidentally.
• If nothing changes, confirm that the input actually contains the pattern or structure this tool operates on.
• If the page feels slow, reduce the input size and test a smaller sample first.

Tips

If adding an ellipsis suffix, account for its length in the maximum. Setting max to 100 with a '...' suffix means content is cut at 97 characters plus 3 for the ellipsis.