Detect exact duplicate records in a spreadsheet or delimited file. Everything runs locally, with no account required.
XLSX · CSV
XLSX ≤ 30 MB compressed · expanded ≤ 150 MB · 100,000 rows × 1,000 columns · CSV/TSV ≤ 50 MB
Detect exact duplicate records in a spreadsheet or delimited file.
Content is processed in your browser · Not sent to the application server · Free to use
The tool builds a normalized signature from every selected row value and groups records with identical signatures.
The comparison is deterministic: the same files and settings produce the same classification. File contents remain inside the current browser session.
No. ExactDiff reports them without changing the source file.
Completely blank rows are ignored; repeated populated rows are reported.
Runs in your browser
Content is processed in your browser and not sent to the application server
Works without an account