Secure CSV to Excel Conversion
Transform untrusted CSV files into clean, validated Excel workbooks—entirely offline. Features verified formula
neutralization (strips =, +, -, @ prefixes), Ed25519-signed
licensing, and deterministic output.
Why SterileCSV
SterileCSV is a desktop application that runs entirely on your Windows machine—no cloud, no tracking, no data upload. It transforms potentially dangerous CSV files into clean, validated Excel workbooks you can trust.
Preserves leading zeros (e.g., in numeric IDs) and automatically detects Dates, Decimals, and Booleans. Prevents data corruption common in standard Excel imports.
Recursively inspects fields to strip
dangerous prefixes (=, +, -, @) that allow CSV
Injection attacks.
Generates polished workbooks with frozen header panes (A2), auto-calculated column widths, and correct data types.
Includes a "Summary" sheet in every workbook with row counts, schema details, and a deterministic SHA-256 hash.
Offline-activated licenses signed with high-security Ed25519 cryptography. No verification servers.
100% offline. No cloud uploads, no telemetry. Your sensitive data never leaves your local machine's RAM.
Is SterileCSV right for you?
✅ What it does
- Converts CSVs to Excel (XLSX) securely.
- Automatically formats columns & types.
- Works 100% offline on Windows.
- Creates an audit trail (hashes/logs).
❌ What it doesn't do
- It does not edit data (use Excel for that).
- It does not repair corrupted files.
- It does not run macros or VBA scripts.
- It does not connect to the internet.
System Requirements
Windows 10/11 (64-bit) • No admin rights required • Delivered via Email
Your personalized license.json is delivered via email within 1 business day.
You may see a "Windows protected your PC" (SmartScreen) popup. This is normal for specialized software not yet in Microsoft's global whitelist.
To install: Click More info → Run anyway.