CSV Precheck & Repair Tool
Upload a CSV, inspect common Excel/import risks, and export a clean UTF-8 CSV.
Your files stay private. Your CSV file contents are processed locally in your browser and are not uploaded. Always review cleaned output before relying on it.
Choose the CSV type to add extra review flags. Export still works for every profile.
Flags common file-format and Excel/import-readiness issues for review.
Argon flags common file-format and structure issues for review. It does not guarantee platform import behavior.
What are you trying to check?
These hints stay in your browser. They do not upload, store, or track your CSV contents.
Optional. This note stays in your browser and can be included in your local Precheck Report. Do not paste private CSV contents here.
Upload CSV/TXT files
Select one file or a batch of files. Each file is processed locally in your browser.
Batch mode: diagnostics run for every file; preview/export uses the selected file.
Import precheck guides
Practical CSV checks before imports and updates
Precheck a Shopify product CSV
Review product CSV headers, rows, SKUs, handles, and values Excel may change before import.
Read guideClean a contact CSV before HubSpot import
Check duplicate emails, blank emails, weird characters, extra spaces, and row issues before import.
Read guideCheck a Mailchimp contact CSV
Find duplicate, blank, and malformed-looking email rows before importing a contact CSV.
Read guideCSV opens in one column in Excel?
Check delimiter issues, semicolons, tabs, and wrapped exports before re-exporting a clean CSV.
Read guideA supplier sent you a CSV?
Inspect supplier product lists, SKUs, IDs, weird characters, and rows before opening in Excel.
Read guideCompare two CSV files before importing
Plan an old-vs-new CSV review around stable keys, changed fields, blank keys, and duplicate keys.
Read guideCompare WooCommerce product CSVs
Compare by SKU or ID and review changed rows before updating products.
Read guide