Offline Data Cleaning Tool
for Messy CSV & Traditional Spreadsheets Files
Prepare CSV exports by checking data types, missing values, duplicate records, and inconsistent text. Review each transformation before exporting a clean copy. No Python. No cloud. Just clean data.
Start Cleaning for FreeDesktop app · Works fully offlineExample: Review a Cleaning Result
DataOlllo detects mixed formats like 12/31/2025, 2025-31-12, currency symbols, broken encodings, and normalizes them in one step.
Built for Dirty Datasets
Automated Normalization
Inspect formatting inconsistencies and choose transformations deliberately. Check ambiguous dates and preserve IDs with leading zeros. Optional AI assistance requires reviewing the generated operation and its result.
Massive File Support
Start with a preview and check how columns are parsed before transforming a large file. Capacity depends on the operation and available resources. When fields open in one column, use the free CSV delimiter detector to confirm the separator.
Deduplicate & Extract
Remove duplicate records with fuzzy matching, split complex text into columns, and scrub PII before sharing data.
Built for people who hate cleaning data
Analysts, ops teams, ecommerce sellers, and founders who just want their data usable — fast. If traditional spreadsheets feel fragile and cloud tools feel risky, a private CSV analyzer keeps the cleanup workflow on your computer.
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