CSVCSV Dock

Private, local-first data tools

Online CSV Viewer

Open, inspect, search and convert CSV files in your browser. Your files stay on your device.

Processed in your browserNo account requiredEncoding and delimiter controlsIncomplete exports are blocked
JSON export options
CSV export options
Drop a file, paste data, load a CORS-enabled URL, or try the sample.
Rows0
Columns0
EncodingAuto
DelimiterAuto
Issue groups0

Open a data file to start

The parser runs off the main thread. Once loaded, you can search, sort, validate, repair and export without an account.

What this tool does

Online CSV Viewer

The viewer reads CSV, TSV and other delimited text in a dedicated browser worker. It detects common encodings, delimiters, line endings and likely headers, then shows a virtualized preview that remains responsive while you search or sort retained rows.

How to use it

  1. Drop a CSV file, choose it from your device, paste data, or load a CORS-enabled public URL.
  2. Review the detected encoding, delimiter, header and structural diagnostics.
  3. Search or sort the preview, apply a safe repair if needed, then export CSV, JSON or XLSX.

Common tasks

  • Open a large CSV file online without uploading it or installing Excel.
  • Inspect Shift_JIS, UTF-8, UTF-16 or Windows-1252 CSV files and correct the detected encoding.
  • Search, sort and preview CSV or TSV data before converting or sharing it.

Privacy and local processing

Local files are read by a dedicated browser worker and are not uploaded to an application server. File contents and filenames are not included in analytics events. Loading a public URL is an explicit direct request from your browser and may fail when the remote server blocks CORS.

Supported edge cases

  • Quoted commas and multiline quoted fields are parsed as one value.
  • UTF-8 BOM, UTF-16 LE/BE, Windows-1252 and Shift_JIS can be detected or selected manually.
  • Files over 250,000 data rows enter preview-only mode; export is disabled rather than silently truncating data.

Frequently asked questions

Are CSV files uploaded to a server?

No. Local files are passed directly to a browser worker. The application does not send file contents or filenames to an application server.

Can this open semicolon or tab-separated files?

Yes. The viewer detects comma, tab, semicolon and pipe delimiters, and you can override the result before reparsing.

Can I turn a CSV into a table?

Yes. Open the CSV to view it as a searchable, sortable table in the browser, then export CSV, JSON or XLSX if you need another format.

Why is export disabled for a very large file?

The MVP intentionally prevents incomplete downloads when a file exceeds its 250,000-row full-data limit. You can still inspect a retained preview.

Related CSV tools

Convert Text to CSVConvert pasted text or TXT files to CSV locally. Detect tabs, semicolons, pipes and commas, preview columns and download a clean CSV.Convert CSV to ExcelConvert CSV to Excel XLSX or XLS locally in your browser. Preserve leading zeros, inspect delimiters and download without uploading your data.Convert JSON to CSVConvert JSON arrays and nested objects to CSV locally. Choose an array path, flatten fields, preview columns and export CSV or XLSX.Convert Excel to CSVConvert Excel XLSX and XLS worksheets to CSV in your browser. Select a sheet or download all sheets as a ZIP without uploading the workbook.