PDFKing is a browser-based PDF tool hub offering over 22 free tools for merging, splitting, compressing, converting, and editing PDF documents. It's designed for students, small business owners, freelancers, and professionals who need to handle common document tasks without installing software or creating an account. The tools cover conversions between PDF and Word, JPG, HTML and text formats, along with capabilities for signing, watermarking, redacting, and adding metadata.