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CSV Duplicate Remover

Remove repeated rows while preserving order.

Private by design· Processed locally · Originals unchanged

Exact whole-row matching; case-sensitive. Keeps the first copy and the header.

UTF-8 · 10 MB total · 100,000 rows · 200 columns

Formula-like cells are preserved. Review untrusted CSV before opening it in spreadsheet software.

Privacy, limitations & disclaimers

UTF-8 only. Up to 10 MB total; 100,000 rows and 200 columns. CSV must be rectangular with a header. Split limited to 100 output files. JSON supports arrays of flat objects with scalar values; missing fields become empty cells. Spreadsheet formula cells are preserved; review untrusted CSV before opening in spreadsheet software.

Your selected files are processed in your browser. They are not uploaded to FilesStayLocal servers for processing. Your original files are not overwritten; processed results are provided as separate downloads.

Review downloaded results before relying on them. Processing may change formatting, image quality, metadata or other file characteristics. Keep your original files as a backup. Browser memory and supported-format limitations apply.

Reset clears temporary interface state and releases eligible preview URLs. It does not securely erase browser or device storage.

Select files to see a local Before → After preview. Downloads become available only after Process locally.