Smartcsv – Convert CSV to Xlsx Instantly in the Browser (batch, No Signup)
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SmartCSV is a tool that converts CSV to XLSX instantly in the browser, with batch processing and no signup required.
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Sep 1, 2025 at 9:28 AM EDT
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What it does
* Drag & drop or browse CSV/TSV files and convert them to Excel (.xlsx) instantly. * Batch processing: convert up to 50 files at once; supports files up to 100MB each. * Smart detection: AI automatically detects encoding (UTF-8, GBK, etc.), delimiters (comma/semicolon/tab/pipe), and column data types with >95% accuracy. * Customizable settings: include/exclude headers, trim whitespace, preserve leading zeros, date/number formats, and preview before download. * Export-ready: handles Excel row limits, preserves formatting where possible, and offers scaled previews for large datasets. * Works on desktop & mobile, PWA-friendly, and uses WebGL / WASM / Web Workers for performance.
Why this might be interesting
* *Privacy-first:* your CSV never leaves your device — zero server upload or storage. * *Fast & practical:* useful for analysts, devs, accountants, and product teams who need reliable conversions without manual cleanup. * *No friction:* no registration, no watermarks, no hidden costs — it’s free to use.
Technical & UX highlights
* Client-side processing (local by default) with optimized chunking for large files so the UI remains responsive. * Intelligent pipeline: encoding detection → delimiter sniffing → type inference → preview → xlsx generation. * Accessibility & mobile-first UI, virtualized preview for huge files, and clear user guidance through a 5-step conversion flow.
How to try
1. Go to `https://csvtoexcel.org` 2. Drag & drop your CSV(s) or click “Upload” 3. Review the AI-detected settings (encoding, delimiter, types) and adjust if needed 4. Click “Convert” and download the generated .xlsx files