Bulk Price Updates in 2 Minutes — Browser Tool for E-commerce

Shop owners burn 10–20 minutes editing Excel for every bulk price change and usually need a developer. I built PriceShift — a browser-based pricing tool that parses XLSX/CSV catalogs, applies hierarchical category markup (subcategory > category > global), and exports in ~2 minutes. **100% client-side — pricing data never leaves the browser.

Client: B2B e-commerce business selling furniture to educational institutions (kindergartens, schools). Catalog: 500–5,000 products across multiple categories, exported as XLSX/CSV with 50–100 columns.

Problem: In an unstable currency environment, supplier costs shift constantly. The legacy workflow (export → Excel → manual formulas → re-import) took 10–20 minutes per session and depended on developer availability.

What I built:

- Browser-based pricing engine — XLSX/XLS/CSV/TSV processed fully client-side
- Multi-language column auto-detection (EN/RU/UA) for Prom.ua, Rozetka, WooCommerce, OpenCart, Shopify exports
- Hierarchical markup logic — subcategory overrides category overrides global
- Real-time preview with color-coded old-vs-new prices before export
- Format-preserving export — all 50–100 original columns kept intact

Result:

- Bulk repricing session: 10–20 min → ~2 min (80–90% time reduction)
- ~1 month of production use with no crashes, no data-loss incidents, no security incidents reported
- Lighthouse: Performance 99/100, Best Practices 100/100, SEO 100/100, Accessibility 90/100**
- Eliminates developer bottleneck for routine pricing ops

Stack: Next.js 16, React 19, TypeScript, Tailwind CSS 4, SheetJS, PapaParse. Static deployment on Vercel Edge — no backend, no database.

"Will my pricing data leak?" No. 100% client-side: no upload, no analytics, no third-party scripts, no server logs.

If you run an SMB e-commerce store and need privacy-safe automation for repetitive operational work, I build similar browser-first tools tailored to your platform and data shape.