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CSV Formatter (C#)

Paste CSV to clean it up (delimiter conversion, consistent quoting, trimming, line endings) and optionally generate a C# method that formats rows into valid RFC 4180-style CSV without external libraries.

Category: Data · URL: /tools/csv-formatter-c.html
Tip: Supports quoted fields with commas and newlines (RFC 4180-style).
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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

Use it to normalize messy CSV and generate C# formatter code.

  1. Paste CSV into the input box.
  2. Select the input delimiter and the desired output delimiter.
  3. Choose a quoting mode (minimal/always/none) and optional trimming.
  4. Click Format (or choose Both to also generate C# code).
  5. Copy the output.
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Secondary intents covered: Format CSV to a consistent delimiter and quoting style, Convert semicolon/tab/pipe-delimited text into standard CSV, Fix CSV escaping by doubling quotes and quoting fields that need it, Trim whitespace around fields while preserving quoted content, Detect common CSV issues (unclosed quotes, inconsistent column counts), Generate reusable C# code to output valid CSV without third-party packages, Copy cleaned CSV or C# code directly into a project

FAQ

Does this follow RFC 4180 CSV rules?

It uses standard RFC 4180-style escaping: quotes are doubled, and fields are quoted when they contain delimiter, quotes, or newlines (or always if you choose).

Can it convert semicolon or tab-delimited files to comma CSV?

Yes. Set the input delimiter to semicolon/tab and the output delimiter to comma, then format.

Will it fix broken quotes in my CSV?

It will detect unclosed quotes and stop with an error so you can correct the input.

What does “Minimal quoting” do?

It only adds quotes when a field needs them (contains delimiter, quotes, or a line break) to keep output compact.

Why do I see a warning about inconsistent column counts?

Some rows have more or fewer fields than others. The tool preserves each row as-is but warns you because many importers expect consistent columns.

Is the generated C# code dependent on CsvHelper or other libraries?

No. The snippet uses only built-in .NET types like StringBuilder.

Does the tool send my CSV to a server?

No. Formatting and code generation run locally in your browser.