CSVUndo
CSVUndo is a free browser-based utility that fixes Excel-damaged CSV files by restoring missing leading zeros and scientific notation numbers.
Open productWhat it does
About CSVUndo
CSVUndo is a free web-based utility designed to repair CSV files damaged by Microsoft Excel. Operating entirely in the browser using JavaScript and the FileReader API, it expands scientific notation numbers back into full digit strings without precision loss and restores dropped leading zeros for fields such as ZIP codes and product identifiers. Built for e-commerce sellers, accountants, logistics teams, and HR staff, CSVUndo processes data entirely on the user's machine without sending files to external servers.
- Availability:
- unknown
- Access:
- free
- Format:
- software
- Platform:
- web
Pricing at launch: 100% free to use with no account signup required.
Core capabilities
Scientific Notation Expansion
Expands long numbers truncated into scientific notation back to full digit strings using exact string calculations without losing precision.
Leading Zero Restoration
Restores missing leading zeros in numerical data such as ZIP codes and product identifiers based on selected columns and specified widths.
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