CSV Viewer

The CSV Viewer turns raw comma-separated text into a readable, sortable table without opening a spreadsheet application. Paste the contents of a file or click Upload File to load it, click View as Table, and the tool parses it, detects the delimiter, reads the header row, and renders every record as a table you can search and sort by column.

CSV looks simple until you meet a real file. Fields wrapped in quotes contain commas. Quotes inside those fields are doubled. Some exports use semicolons because the source locale uses commas as decimal separators. Rows go ragged when an upstream system drops a field. This viewer implements the RFC 4180 quoting rules properly, flags ragged rows and duplicate column names instead of silently mangling them, and lets you switch delimiters when auto-detection guesses wrong.

The built-in sample is a quick way to check any CSV file viewer. Click View as Table and it opens as 5 rows and 5 columns with the delimiter shown as a comma, and the quoted "Rahman, Liton" stays in one cell. Click the salary heading and the rows sort numerically from 67000 to 101000; type engineer in the search box and three rows remain. The same steps work on a large CSV, with one limit: the table draws the first 500 matching rows, while search and sorting cover every row and the CSV and JSON exports include every match.

Everything runs in your browser. The file is read with the FileReader API and parsed in JavaScript - nothing is uploaded, which matters when the CSV holds customer records, payroll data, or an export from a production database. Once the page has loaded, the tool keeps working offline.

CSV is a family of formats rather than one, which is why delimiter detection is the first thing that happens. Comma, semicolon and tab are all in common use, and European locales frequently use semicolons because the comma is the decimal separator. Quoted fields follow RFC 4180, so a comma inside quotes is data rather than a separator and a doubled quote is a literal one. The data quality warnings exist for the cases that are legal but usually wrong: rows with more or fewer fields than the header, which normally means an unescaped quote further up the file, and duplicate column names. Every value stays text, so leading zeros that a spreadsheet would have eaten remain visible. Files are read in the browser, so size is bounded by available memory rather than by an upload limit; very large exports are better sampled than opened whole.