CSV Formatter & Validator

Validate CSV rows, detect delimiter problems, format delimited data and preview columns locally in your browser.

Validate CSV (check for errors) Open the Excel to CSV converter

Need import checks, duplicate headers or row-count errors? Open the dedicated CSV validator.

Convert Excel files to CSV before formatting delimiters or previewing columns.

0 characters

Result appears here. Everything runs in your browser.

Ready

Table preview

No rows parsed yet

Spreadsheet export checks

Find rows with missing or extra columns before importing customer lists, reports or analytics exports.

Delimited text cleanup

Normalize comma, semicolon, tab and pipe separated text into clean CSV or TSV output.

Private local processing

CSV parsing and formatting happen in JavaScript on your device. No upload endpoint is involved.

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More browser-native utilities

CSV Formatter

Parse delimited text, show its rows and columns, and emit consistently formatted CSV.

Input
CSV text or a local delimited file plus delimiter and quote settings.
Output
A validated table preview and normalized CSV text.
Real limitations
The parser does not infer business types, repair ambiguous quoting, or guarantee compatibility with every spreadsheet import setting.
Privacy and data handling
CSV text or a local delimited file plus delimiter and quote settings is processed in this browser tab. Convertr does not receive or store it; closing or reloading the page clears the working state unless the tool explicitly offers a local download.

How to use this tool

  1. Provide CSV text or a local delimited file plus delimiter and quote settings in the tool controls.
  2. Choose the settings that affect a validated table preview and normalized CSV text, then run the tool.
  3. Review a validated table preview and normalized CSV text before copying or downloading it.

Common failure modes

Ragged rows, unclosed quotes, invalid encoding, or a delimiter that does not match the file can stop parsing.

Useful example

Paste three comma-separated rows, confirm the detected headers, and download normalized UTF-8 CSV.