Split, merge & clean CSV files — without uploading them.

Every tool on this site is written in JavaScript that runs entirely in your browser. Open your browser's developer tools, switch to the Network tab, drop a file, process it — you'll see zero outgoing requests containing your file. The tools work even if you turn off Wi-Fi after the page loads, which proves the point.

CSV (comma-separated), TSV (tab-separated), and Excel (.xlsx and .xls). You can mix formats — drop an Excel file into a tool, output as CSV, or vice versa. Semicolon-delimited CSVs (common in European locales) are auto-detected too.

No server-side limit exists because there's no server. The practical limit is your browser's available memory. Files up to 500 MB work comfortably; 1–2 GB works on Chrome/Edge with 8+ GB of RAM. Beyond 2 GB you may need to split the file first using row-count mode.

Yes. Every tool is responsive and works on iOS Safari and Android Chrome. Mobile browsers have less memory than desktops, so very large files (200 MB+) may be slow or run out of memory. For routine CSV work (a few MB), mobile is fine.

Split — your file is too big to upload. Merge — you have multiple files that should be one. Remove duplicates — duplicate records are causing issues. Filter — you want only some rows. CSV ↔ JSON — your API expects JSON but you have a spreadsheet (or vice versa). Find & Replace — you need to normalize values ("United States" → "USA"). Sort — you want rows in a specific order. Validate — your import keeps failing and you don't know why.

No. There are no accounts, no signups, no email collection. The site doesn't know who you are or what you processed. Your preferences (theme, tool settings) are stored in your browser's localStorage — they never leave your device.

The most common reasons: (1) blank or duplicate header columns, (2) encoding issues (the file is Windows-1252 but the importer expects UTF-8), (3) row-length mismatches caused by unescaped commas in free-text fields, (4) leading zeros stripped when Excel "helpfully" converted ZIP codes to numbers. Run the Validate tool first — it catches all of these in seconds.

Yes, with no licensing fees. The site is free to use for personal or commercial purposes. If your organization has strict compliance rules (HIPAA, GDPR), the browser-only architecture usually satisfies them — since we never receive your data, there's no data processor relationship to manage.

Non-intrusive ads (via Google AdSense, when approved) fund the hosting. That's it — no freemium gates, no "upgrade to process bigger files," no paid tiers. If you find the tools useful, tell a colleague. That's the only growth we need.

Email us at [email protected] with as much detail as you can — what you were trying to do, what the file looked like (redact sensitive data first), what happened vs what you expected. We read every email.