CSVUndo
Undo Excel damage to CSVs (1.23E+12, lost zeros) in-browser
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. --> Or paste CSV data: 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…from csvundo.com
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Hello HN, I'm excited to share a project I've been working on: A simple, fast way to process huge CSV and XLSX files directly in your browser and export them as clean JSON or XML Here's a few things that makes this converter different: - runs in the browser - all parsing and conversion is client side can handle data any size data - automatically detects delimiters, encodings, and data types as it parses - Live preview with column renaming, search/replace, and data cleanup - Export to JSON or XML — clean, structured output that can be used for API or Databases backstory: I built this…
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