5iTech is your free forever hub for clean, fast, and reliable online tools & converters — built for students, professionals, developers, and anyone who wants quick results without sign-ups, watermarks, or hidden fees. Convert images to PDF, merge/split PDFs, resize & compress images, images to text, generate QR codes & barcodes, create invoices instantly, send WhatsApp messages (single + bulk), calculate GST/EMI/BMI/age/distance, convert currencies/units, validate LLMs, check AI readiness.