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Data & Spreadsheets

Merge CSV Files.

Append selected CSV files with reviewable union-by-name schema reconciliation or strict exact-schema mode. Data stays in this browser. Append selected CSV files with reviewable union-by-name schema reconciliation or strict exact-schema mode.

Use Merge CSV Files

Private in this browser. Bytes, schema, values and outputs stay in this browser.

No file selected.
Tool options

Options appear after the file is inspected locally.

Preparing the local tool…

How it works

  1. 01

    Choose local data and review the options.

  2. 02

    Run the bounded operation in a worker.

  3. 03

    Download only the independently verified result.

Frequently asked questions

Is data uploaded?

No. The operation runs locally.

Does Merge CSV Files upload my data?

Merge CSV Files runs locally in your browser. Bytes, schema, values and outputs stay in this browser.

What output does Merge CSV Files create?

Merge CSV Files creates Csv output after the result passes its local verification checks.

Large CSV ViewerStream, search and page through a CSV locally while keeping every value as text, then independently rescan the source before downloading a bounded JSON report.Data AnonymizerMask, hash, tokenize, generalize or synthesize selected CSV columns locally, then independently reparse and verify every transformed cell before download.CSV CleanerReview detected delimiter and UTF-8/UTF-16 encoding, then repair whitespace, blank rows, quoting and newlines to normalized UTF-8 CSV.
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