Excel & CSV

CSV and Excel store tabular data in fundamentally different ways. CSV is raw plain text that relies on exact delimiters like commas, semicolons, or tabs and strict character encoding. When software uses mismatched regional defaults, entire rows collapse into single cells, and special characters render as corrupted symbols. Spreadsheet programs also tend to auto-convert numeric text, stripping essential leading zeros from barcodes, stock keeping units (SKUs), and international phone numbers. At the same time, platforms like Shopify, WooCommerce, and backend database APIs reject native workbook files, requiring properly formatted and delimited plain text instead.

These utilities handle conversions between workbook formats and plain text, standardize mismatched delimiters, combine multiple tables, and deduplicate rows while preserving text-formatted numbers. Every operation runs entirely inside your web browser using local system memory, so your datasets remain completely private on your device without file size paywalls or account requirements. The tools output clean UTF-8 text with optional byte order markers for spreadsheet compatibility. Because execution depends on your device CPU and available browser memory, files with tens of thousands of rows process reliably, though extremely large gigabyte-sized files may encounter browser memory limits.