CSV Formatter and Validator
Auto-detects the delimiter, re-quotes to RFC 4180 or aligns columns for reading, and reports rows whose field count does not match the header.
Detected delimiter: semicolon. 5 row(s), 4 column(s). 2 ragged row(s): line 4 has 3 field(s), expected 4; line 5 has 5 field(s), expected 4
CSV Formatter and Validator — Free Online Tool
Formats and validates delimited data by auto-detecting the delimiter (comma, semicolon, tab or pipe), re-quoting fields per RFC 4180, optionally aligning columns into a readable fixed-width view, and flagging ragged rows that have more or fewer fields than the header, useful for debugging exports before a database import fails halfway through.
How to use the CSV Formatter and Validator
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
How does delimiter auto-detection work?
Each candidate (comma, semicolon, tab, pipe) is trial-parsed over the first rows, and the one producing the most consistent field count wins. That beats counting characters, which a comma inside quoted text would skew.
What is a ragged row?
A row whose field count differs from the header — the single most common reason a database import fails partway through. Usually an unescaped delimiter inside a value or a missing closing quote a few lines earlier.
What is the difference between the two modes?
Normalize re-quotes everything per RFC 4180 and outputs a comma-delimited file a database or spreadsheet will accept. Align pads the columns into a fixed-width table that is only for reading — do not feed it back to an importer.
Free & private — why use this CSV Formatter and Validator
The CSV Formatter and Validator runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.