Workspace Compare files Private by design

GOOD DATA STARTS WITH A LITTLE CLARITY.

Find what changed. Keep the context.

Inspect, tidy, and compare your tables. Your files never leave this browser.

00123Strings stay strings.IDs and leading zeroes preserved

Bring your data to the bench

CSV or TSV · 25 MB per file · 100,000 rows · 200 columns · 2 million cells

Settings apply on import. Reimporting the first file resets its recipe; the second file is compared as imported.

First file · before

Drop a CSV or TSV here, or choose a file from your device.

Second file · after

Choose the updated file to see what changed.

Get the full picture

See rows, columns, and missing values without guessing at data types.

A recipe you can rewind

Trim, filter, sort, and deduplicate. Undo every step along the way.

Export with intention

Choose CSV, TSV, or JSON, with an explicit spreadsheet-safe option.

A private workspace for everyday data. Files and recipes stay in session memory. Clear removes app references; closing this page ends the workspace. App assets still load from this site.

A little guidance for the next step.

Clean a CSVSupported inputs, choices, and limitsRemove duplicate rowsSupported inputs, choices, and limitsCompare two filesSupported inputs, choices, and limitsConvert CSV to JSONSupported inputs, choices, and limitsConvert TSV to CSVSupported inputs, choices, and limits

Compare two CSV files by key

Import a first file and an updated second file with the same uniquely named columns. Select keys in the first file. Comparison uses the working recipe output on the left and the second file as imported. Duplicate-key groups are ambiguous and excluded from matching, with row numbers available in a conflict report. Download added, removed, and before/after changed rows separately.

Limits: 25 MB per input, 100,000 rows, 200 columns, two files for comparison, and a 2 million cell working guardrail. Parse errors stop import and report logical record numbers, including the header; multiline records may span several physical lines. Recheck import settings or repair the source file. No formulas, macros, automatic numeric/date conversions, XLSX, or remote processing are supported.