UsefulDock

Small data jobs, handled carefully

Work with CSV files without handing them over.

UsefulDock makes focused tools for inspecting, comparing, and combining everyday data files. Your files stay in the browser, and you see the impact before downloading a new result.

Choose a CSV tool

CSV tools

Start with the job in front of you.

Free to use · No account · Up to 10 MB per file

Check before another tool guesses CSV Inspector Understand encoding, delimiters, malformed rows, duplicate headers, blank values, and spreadsheet risks. Open CSV Inspector Encoding & delimitersLine-level findingsHealth report Compare two versions Keyed CSV Diff Find added, removed, and changed records using an ID, email, SKU, or another shared key. Open CSV Diff Field-level changesIgnore selected columnsExport report Combine related exports CSV Merge by Key Join two files while checking blank keys, duplicates, unmatched records, and projected output rows. Open CSV Merge Left, inner & full joinsDuplicate safeguardsUnmatched exports

The UsefulDock standard

A result you can inspect before you trust it.

CSV work often fails quietly. Our tools make risky conditions visible before producing a new file.

  1. 1
    Load locally

    Your file is read in browser memory, not uploaded to us.

  2. 2
    Diagnose

    See blanks, duplicates, mismatches, and other relevant risks.

  3. 3
    Review impact

    Understand what changes and how many rows the result will contain.

  4. 4
    Download a copy

    Your source remains untouched; the result is a separate file.

Built for repeatable confidence

Focused tools, not another data platform.

UsefulDock is growing around the moments when a spreadsheet export is almost right—but needs a careful check before it goes somewhere important.