MessyMatch

What it does

MessyMatch helps you compare messy CSV, Excel, TXT, SQL or flat JSON files side by side (spot missing rows, near-duplicates and formatting mismatches in seconds). Use fuzzy matching to catch almost-identical values that exact comparison misses. Split large files into import-ready parts by row count or column value. Merge multiple sources into one clean output with deduplication and union schema. Everything runs in your browser. No formulas, no scripts, no account needed for small files.

Compare, split & merge messy CSV/Excel/TXT files in your browser. Find missing rows, partition big files, or combine files into one clean output.

Four browser-only tools for messy data: find missing rows, split a large export into smaller files, merge sources into one, and anonymize PII before sharing it with a teammate or an AI assistant. Nothing leaves your tab. No upload. The anonymization mapping stays on your machine. Reverse it any time. Parsing, comparison, splitting, merging and anonymization run in a Web Worker inside your browser. No upload, no cloud processing. Just JavaScript on your tab against your file. Hash, redact, faker and pseudonymize methods, with a separate mapping file you control. Send anonymized data to ChatGPT, get the answer back, then translate tokens to real values locally. No second exposure. Stop…from messymatch.com

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