FastTools is a collection of free, browser based tools for developers, freelancers, and small businesses. It provides utilities for creating invoices, calculating payment processing fees, building cron schedules, converting bank statements, estimating freelance rates, converting JSON to TypeScript and Zod schemas, and analyzing SEO keywords. Users can work with common tasks directly in the browser. The invoice generator creates print ready PDFs with configurable tax rules and currency formatting. The bank statement converter extracts transactions from PDFs into CSV, Excel, or JSON and checks running balances. The Stripe calculator estimates fees and net payouts for supported regions, while the cron builder produces schedule descriptions and upcoming execution times. Other tools support rate calculations based on take home pay and business costs, code generation from JSON, and search intent analysis. FastTools states that its tools process data locally in the browser, without signups, tracking, or server uploads. Financial documents and other inputs are handled in browser memory rather than stored in a cloud database. The site describes the tools as using JavaScript and browser native WebAssembly where applicable, and the fee calculator uses integer arithmetic for currency calculations.