Frequently Asked Questions
Clear, direct answers about privacy, performance thresholds, Excel character encoding, and browser safety.
Local CSV uses the HTML5 FileReader API and background Web Workers inside your web browser. When you drop a file, your device's CPU reads and transforms the dataset directly in temporary memory without making any outbound network requests.
Local CSV can parse datasets containing 500,000+ rows (often 50MB to 100MB+ of raw CSV data). Performance depends on your device's RAM, as all data is kept in-memory to guarantee absolute privacy.
Excel frequently expects a UTF-8 Byte Order Mark (BOM) or legacy Windows-1252 encoding. You can use our CSV Encoding Fixer tool to re-save your file as clean UTF-8 with proper encoding headers.
Yes. Once the web page and parser scripts load in your browser cache, you can disconnect from the internet entirely and all CSV cleaning, deduplication, and export functions continue to operate normally.
Yes. Because Local CSV does not collect, transmit, log, or persist sensitive records onto any remote server, it qualifies as local client-side software, eliminating third-party data processor liabilities.
Local CSV is part of the LMSTools.cloud family of privacy-first browser tools. While LMSTools.cloud specializes in LMS packaging and SCORM utilities, Local CSV provides dedicated spreadsheet and tabular data tools.