Skip to main content
Toolzum

Document format · .csv

CSV: what it’s for

CSV (comma-separated values) is the simplest tabular format: rows of values that open in Excel, Google Sheets, databases, and data tools everywhere. It is the pragmatic bridge between spreadsheets and code — convert it to JSON for APIs or clean it up for analysis.

Strengths

  • Opens in every spreadsheet app and data tool ever made
  • Tiny, plain-text files that diff cleanly in version control
  • Our tools sort, split, merge, clean, and analyze CSVs locally
  • Converts directly to JSON for APIs and web apps

Honest limits

  • No data types — everything is text until something interprets it
  • Delimiter and quoting chaos across locales (commas vs. semicolons)
  • No formulas, formatting, or multiple sheets — use XLSX for workbooks
  • Excel mangles UTF-8 without a BOM and eats leading zeros in IDs

Free CSV tools

Every tool runs in your browser — files never leave your device. Badges say exactly what each tool does with CSV.

CSV FAQs

How do I split a huge CSV into smaller files?

The CSV splitter divides by row count or chunk size locally — no upload, so even multi-megabyte exports process fast in your browser.

Why does Excel garble my CSV characters?

Excel expects a UTF-8 BOM marker and your locale's delimiter (often semicolons in Europe). Re-save with BOM or switch delimiters before opening.

Can I combine multiple CSVs into one?

Yes — the CSV merger stacks files with matching columns into a single download, all locally.

Does CSV processing upload my data?

Never. Sorting, merging, and converting run in your browser, which matters for customer and financial data.