21K Tools

21K Tools – Free Online Tools: File Converter, Image Resizer, QR Code & PDF Toolkit 21K Tools - Free online tools for URL shortening, PDF editing, file conversion, image resizing, calculators and more. 21K Tools - Free online tools for URL shortening, PDF editing, file conversion, image resizing, calculators and more. Access 9+ Free browser-based tools for everyday digital tasks. Convert files, resize images, generate QR codes, merge PDFs, shorten URLs, and calculate anything — directly in your browser. No sign-up required.