Comparador CSV Diff

CSV Diff Checker is a developer tool that compares two CSV files using key-based matching instead of line-based diff. It detects added, removed, and modified rows with field-level change highlighting. Everything runs 100% in your browser — your data never leaves your machine.

1. 1.Paste or upload your original CSV in the left panel and the modified CSV in the right panel.
2. 2.Select a key column (auto-detected or manual) for row matching.
3. 3.Configure options: delimiter, case sensitivity, whitespace trimming.
4. 4.Click Compare to see the diff results.
5. 5.Switch between Table, Grouped, Side-by-Side, and JSON views.
6. 6.Filter by change type, column, or search keyword.
7. 7.Export results as JSON or CSV.

• •Key-based diff — matches rows by primary key, not line position.
• •Field-level changes — highlights exactly which cells changed.
• •4 view modes — Table with cell highlighting, Grouped diff, Side-by-Side comparison, and raw JSON.
• •Column insights — shows per-column change statistics.
• •Smart filtering — filter by change type, column, or search keyword.
• •Drag & drop upload — supports CSV, TSV, and text files.
• •Configurable parsing — delimiter, header toggle, whitespace trimming, case sensitivity.
• •Export — download diff as JSON or CSV.
• •Fullscreen mode — expand results for large datasets.
• •100% client-side — your data never leaves the browser.

• •Comparing database exports before and after migrations.
• •Validating CSV data transformations in ETL pipelines.
• •Reviewing config file changes (feature flags, pricing tables).
• •QA testing — comparing expected vs actual CSV output.
• •Debugging data sync issues between systems.
• •Auditing spreadsheet changes across versions.