Open files
Load the file you want to work with (File A). If you're comparing two versions, also load File B — pick the matching key and run the comparison on the Compare tab. Nothing is uploaded; everything happens in this browser.
File A (primary / older version)
Not loaded.
File B (optional — newer version, for comparing)
Not loaded.
Edit — File A
Compare
Compare setup
Normalize matches keys like "(555) 123-4567" and "5551234567" as the same record — the displayed key becomes the normalized (digits-only) form for matched/compared rows.
Filter results (view only — exports always use everything)
Merge & Export
Diff report
One line per change (added/removed rows, and one line per changed cell). Color-coded in the Excel version.
Merged file
Builds the final file: unchanged rows pass through, each added/removed/changed row follows its "Include in Merge" setting from the Compare grid (default: keep additions and changes, drop removals).
Automation templates
Save the current compare setup (key columns, ignored columns, options) under a name so a recurring check is one click instead of re-picking columns every time. A browser can't silently reopen a file from your disk, so loading a template pre-fills these settings — you still pick File A / File B yourself on the Open tab.
| Name | Key column(s) | Ignored | Options |
|---|