CSV & Excel Viewer + Editor (Local, No Upload)

Open and edit CSV or Excel spreadsheets directly in your browser. This PlainBench tool runs locally, so your files never leave your computer. Clean up data, fix headers, add or remove rows, and export back to CSV or .xlsx with no logins, trials, or uploads.

What you can do with this local CSV & Excel viewer

  • Open CSV or Excel (.xlsx) files directly from your device.
  • Work in an Excel-style grid with row numbers and column letters.
  • Edit cells inline with full content visible and line wrapping.
  • Use quick cleaning tools to trim spaces, remove empty rows, and uppercase headers.
  • Search and highlight text across the sheet.
  • View quick column stats including count, unique values, min, max, and average for numeric columns.
  • Export back to CSV or Excel with your changes applied.
  • Local only – your spreadsheet stays in the browser, never uploaded.

CSV & Excel viewer/editor

Upload a spreadsheet file or start from a blank grid, make your edits in a comfortable Excel-like workspace, then export — all without leaving your browser.

1. Open a CSV/Excel file or start blank

Choose a .csv or .xlsx file from your device. All parsing happens locally in your browser; nothing is uploaded anywhere.

No file loaded yet.

Or start a blank sheet

Toggle this if your CSV doesn’t include a header row or you want to promote the first data row to headers.

ACTIVE CELL None
Click a cell in the grid to view and edit its full contents.
2. Edit cells, clean data, and reshape

Tap or click any cell to edit it. Use the controls below to add or remove rows and columns. On mobile, swipe left/right to scroll the grid.

Quick clean
Load a file or create a blank sheet to begin.
Selection: None
Sheet: 0 rows × 0 columns
3. Export your updated sheet

When you’re done editing, export the data back to a file you can open in Excel, Google Sheets, or any other spreadsheet app.

Tip: keep your original file as a backup. Save a new version with a different name (e.g. data-cleaned.csv) so you can always go back.