CSV Alter

A simple editor — edit cells, add, remove, and move rows and columns. No auto-formatting.

Drop a CSV file here

or click to browse your files

Your file is processed entirely in your browser — nothing is uploaded to any server.

Edit CSV files without Excel's surprises

Excel and Google Sheets are spreadsheet applications — they assume your data should be interpreted and formatted. That's useful for financial models, but destructive when you just want to open, tweak, and re-export a CSV without anything changing. This editor treats every cell as plain text and exports exactly what it received.

Dates stay as strings: Excel silently converts date-like values the moment a file is opened. 2024-01-05 becomes an internal serial number, 3/4 becomes March 4, and 1-2 becomes January 2. Here, those values are untouched.
Leading zeros are preserved: ZIP codes, phone numbers, national IDs, and product codes often start with 0. Excel strips them on import. A ZIP code like 00123 stays 00123, not 123.
Large numbers don't become scientific notation: Order IDs, barcodes, and other long numeric strings get shortened by Excel to something like 1.23457E+14, making the original value unrecoverable. Every digit is kept here.
No formula injection: Cells that begin with =, +, or @ are treated as formulas by Excel, not as data. This editor stores and exports them verbatim.