Small data-format differences can disrupt an otherwise simple import. CSV Canonicalizer is a free browser-local utility for turning a carefully defined pasted-text CSV subset into predictable comma-delimited output with CRLF record endings.
What it does
The tool accepts pasted UTF-8 CSV text up to 256 KiB, comma delimiters, LF or CRLF input endings, and RFC-4180-style quoted fields. It emits minimally quoted comma-delimited output with CRLF endings and one final CRLF.
Malformed or unsupported input is refused with a line, column, and plain-language reason. The utility does not guess a dialect or silently repair questionable data.
What stays local
Processing occurs in the browser. The product has no upload mechanism, account, analytics, application-server storage, or network-processing feature. Pasted text remains in the current page interaction, and users should still avoid confidential or regulated information.
Know the boundary
This is not a universal CSV parser. It does not accept file uploads, semicolon or tab delimiters, malformed-data repair, shared records, or persistent storage. Those limits are deliberate so the tool can remain understandable and self-contained.
Try it and get help
Open CSV Canonicalizer 1.0.0 in a new tab or read its instructions, before-and-after examples, FAQ, troubleshooting, and known limitations. Reproducible problems can be reported through the linked AMT contact form using synthetic sample data.
You can also explore AMT’s other Work & Tools.