The CSV Pro

The CSV Pro is a set of 20 free tools for CSV and Excel files that run entirely in your browser. There is no backend. The file is parsed by JavaScript on your own machine, so nothing is uploaded, nothing is stored, and no account is required. You can open devtools and watch the network tab stay empty while you work. Why that matters: every other converter online asks you to upload the file first. Fine for a grocery list, less fine for a customer export, a payroll sheet or anything with names and emails in it. What is in it Converters: CSV to JSON, Excel, SQL, XML and Markdown, plus the reverse for each. Excel to CSV, JSON, SQL and HTML. HTML tables to CSV. Plain text to CSV. Utilities: a viewer that opens large files with search, column sorting and paging. Split a big file into chunks. Merge several files, matching columns by header name rather than position. Deduplicate rows. Convert delimiters, which is what you need for the semicolon files European Excel produces. The part that actually matters All 20 tools share one parser written to RFC 4180, and that is the difference between this and the quick script most people write once and then fight with. Quoted fields, commas inside quotes, line breaks inside a single cell, byte order marks, mixed delimiters and ragged rows are handled instead of silently shifting your columns by one and corrupting the file without telling you. Free, no sign-up, no watermark, and no file size cap imposed by a server, because there is no server.