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DataTray

Free tools & guides

Free tools for the files that break Excel

Converters and guides for CSV, Excel, Parquet and JSON. Every one of them runs on your own machine — there is nothing here that asks you to upload a file first.

Guides

Recent guides

  1. 4 min read

    How to Anonymize a Data File Before You Share It

    Find the personal data in a file and mask, hash, tokenize or generalize it — on your own machine, with every finding shown for you to confirm before anything is rewritten.

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  2. 5 min read

    How to Clean a Data File Without Writing a Script

    Fix the twenty things wrong with every export — whitespace, mixed date formats, numbers stored as text, lost leading zeros, bad encoding — in one previewable pass on your own PC.

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  3. 4 min read

    How to Compare Two Excel Files and See Exactly What Changed

    Compare two Excel, CSV or Parquet files on your own PC: schema drift, added and removed rows, and cell-level differences — with tolerances so float noise is not reported as a change.

    Read more
Browse all guides

Converters

Convert a data file

CSV to ExcelConvert CSV files to Excel on your own PC. No upload, no file-size cap, and leading zeros and long IDs survive the trip. Free for Windows 10 and 11.CSV to XLSXConvert .csv to .xlsx on your own machine, in batch, with explicit column types so nothing is mangled on the way. Free, offline, no size limit.JSON to CSVConvert JSON and NDJSON to CSV on your own PC — including nested objects and arrays — without pasting your data into a website. Free for Windows.JSON to ExcelTurn JSON or NDJSON into an Excel workbook on your own PC. Nested structures flattened into columns, no upload, no size cap. Free for Windows 10 and 11.CSV to JSONConvert CSV to JSON or NDJSON on your own machine, with real types rather than everything quoted as a string. Free for Windows, no upload.XML to ExcelConvert XML feeds and exports into an Excel workbook on your own PC. Repeating elements become rows, attributes become columns. Free, offline, no size cap.Excel to JSONConvert Excel workbooks to JSON or NDJSON on your own PC, one file per sheet or all sheets together, with real types. Free for Windows, nothing uploaded.TXT to CSVTurn a .txt data file into a proper CSV on your own PC — tab, pipe or fixed-width columns, any encoding. Free for Windows, no upload.XML to CSVFlatten XML into CSV on your own machine. Repeating elements become rows, attributes and children become columns. Free for Windows, nothing uploaded.TSV to ExcelConvert tab-separated files to Excel on your own PC, with column types you control. Free for Windows 10 and 11, no upload and no size limit.Parquet to CSVOpen and convert .parquet files to CSV on Windows without installing Python or pandas. Whole directories at once, entirely on your own machine.TSV to CSVConvert tab-separated files to comma-separated on your own PC, with correct quoting for values that contain commas. Free for Windows.Excel to XMLConvert an Excel workbook into XML on your own PC, with element names taken from your headers. Free, offline, no size limit.CSV to ParquetConvert CSV to Parquet on Windows without installing Python. Choose zstd, snappy or gzip compression, with column types you control. Free and offline.CSV to HTMLTurn a CSV into a clean HTML table on your own PC — self-contained, no external references, ready to paste into a page or email. Free for Windows.JSONL to CSVConvert JSON Lines and NDJSON log files to CSV on your own machine, with inconsistent records unioned rather than rejected. Free for Windows.Parquet to ExcelOpen a .parquet file on Windows and convert it to an Excel workbook, with no Python and no upload. Whole partitioned directories supported. Free.

All of it is in DataTray too, in batch, with no row limit and no upload.