Truncate CSV Columns
Quickly truncate columns in a CSV file. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Truncate CSV Columns
- 1. Paste the CSV. Enter the file in the input pane. Every field longer than your limit will be cut down to size, while shorter values pass through completely unchanged.
- 2. Set the length cap. Maximum value length is the number of characters each field may keep; anything beyond it is chopped off. Pick the limit your destination enforces, like 255 for a classic varchar column.
- 3. Protect the header. Enable 'Keep the header row intact' so column names are never shortened, even when they exceed the cap. Turn it off only for headerless files where every line is data.
- 4. Copy the clipped file. Copy the output and load it where the original was being rejected. Skim a few previously long fields to confirm the cut point does not remove something you still need.
When to use Truncate CSV Columns
Truncate CSV Columns enforces a maximum length on every field in a file. Databases with varchar limits, form processors and fixed-width consumers reject or silently mangle oversized values, and finding the offending cells manually is tedious. Set the cap once here and the whole file complies.
- Fitting a varchar(255) column. A bulk insert keeps failing because a handful of description fields exceed the table's varchar limit. Truncating everything to 255 characters lets the load finish, with the overflow trimmed predictably.
- Taming free-text columns for preview. A feedback export contains paragraph-long comments that wreck any attempt to skim the table. Capping values at 60 characters produces a preview file where every row fits on one line.
- Meeting an ad platform's field limits. Bulk ad uploads enforce strict title and description lengths. Truncate the creative columns to the platform's limits before upload so validation errors do not bounce the entire sheet.
Examples
Shorten long values
Input
name,quote Ada,The Analytical Engine weaves
Output
name,quote Ada,The Analyt
About the Truncate CSV Columns tool
Truncate CSV Columns runs as plain JavaScript in your browser tab, with no server behind it. Quickly truncate columns in a CSV file. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's CSV Tools section, 133 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with 2 settings, including Maximum value length and Keep the header row intact, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Truncate CSV Columns cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.