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FeuTex · free tools runs in-browser no bloat built by LiMiT

Free CSV Tool

Clean and prep CSV data fast: validate structure, trim whitespace, remove empty rows, dedupe, sort by a column, or keep only the columns you need. Everything runs client-side in your browser.

Category: Data · URL: /tools/free-csv-tool.html
Tip: Auto checks comma/tab/semicolon/pipe.
Name (if header) or 1-based index.
Comma-separated names or 1-based indexes.
No uploads. Runs in your browser. If your CSV uses commas inside values, it should be quoted like "a,b".
Summary will appear here.
Related tools: Online CSV Converter · Online SQL Generator · Online SQL Converter · Validate XML Against XSD
Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Paste CSV data (or load a local file), choose an action, then run.

  1. Paste CSV into the input (or use Load file).
  2. Select Delimiter (Auto works for most CSV/TSV).
  3. Pick an Action (Clean, Validate, Dedupe, Sort, Keep columns).
  4. Click Run and copy or download the output.
Keywords this page targets (natural cluster): free csv tool, csv cleaner online, csv validator, trim csv whitespace, remove empty rows csv, dedupe csv rows, sort csv by column, keep columns from csv, extract columns from csv, csv delimiter auto detect, fix csv formatting, csv row count column count, csv header sort, clean csv file in browser, csv normalize line endings, csv to cleaned csv, remove duplicate rows csv, sort csv numeric column, csv select columns by name, csv select columns by index
Secondary intents covered: Validate that every CSV row has the same number of columns, Trim spaces around values and remove blank lines/rows, Remove duplicate rows while keeping the header, Sort records by a specific column (name or index), Keep only selected columns for export, Auto-detect common delimiters (comma/tab/semicolon/pipe), Download the cleaned result as a CSV file, Quickly summarize row/column counts before importing elsewhere

FAQ

Is this free CSV tool really client-side (no upload)?

Yes. Your CSV stays in your browser; the tool doesn’t send data to a server.

Can it handle quoted values like "New York, NY"?

Yes. It supports standard CSV quoting with double quotes and escaped quotes ("").

What delimiters are supported?

Comma, tab (TSV), semicolon, and pipe. Auto-detect picks the best match for common files.

How do I sort or keep columns by index?

Use 1-based indexes (1 = first column). Example: keep 1,3,5 or sort by 2.

Why does Validate fail on my file?

Usually because some rows have a different number of columns (often caused by missing quotes around delimiters inside values).

Will dedupe remove the header row?

No. If “Has header row” is enabled, the header is kept and only data rows are deduped.

Can I download the cleaned output?

Yes. Click Download to save the current output as output.csv.