50 free online tools for small businesses, shop owners, freelancers and students. Work out GST and sales tax, loan EMI, salary and freelancer tax, property tax, profit margin and zakat; make invoices, quotations, receipts, salary slips and rent agreements as PDF; convert marla and kanal, gold weights and units; create QR codes and barcodes. Everything runs in your browser with no sign-up, and your inputs stay on your device.