Reconcile CSV and Excel Files Online

How Validation Works

To compare two files, you need to pick:

• Shared Column: the join key that appears in both files (for example: Product Name, Account ID, SKU). Rows are aligned using this column before checking anything else. In some cases, the Shared Column itself is also the column you need to reconcile. If so, select it as both the Shared Column and the Validation Column.
• Validation Column: the column whose values you want to confirm are the same across the two files (for example: Revenue, Balance, Status).

Supported Input

CSV (.csv), Excel (.xlsx), and JSON (.json, .ndjson, .jsonl).

You can also paste tabular data directly (Ctrl+V / Cmd+V) — works with data copied from Excel, Google Sheets, CSV text, or LLM outputs (markdown tables).

Legacy Excel (.xls) and macro-enabled (.xlsm) files are blocked.