CSVUndo

What it does

Fix CSV files Excel ruined — expand 1.23E+12 to full numbers, restore lost leading zeros, repair é mojibake. Free, and the file never leaves your browser.

Before you drop anything: press F12 and open the Network tab. Repair a file and watch — no request appears, because there is nowhere for one to go. The full 30-second check → Nothing is being uploaded — this is running on your computer. because .opt-head supplies the block margins and a bare is inline — swapping the tags collapses the spacing above the box. --> No CSV to hand? Download a deliberately broken one and drop it back in: collapsed barcodes , missing ZIP zeros or garbled names — or see all six samples . Excel-safe export wraps long numbers and zero-led codes as ="00501" , so Excel reads them as text and cannot re-damage them when the file is reopened. Leave it off if the file…from csvundo.com

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