klzth is a small, focused tool for one everyday PDF task: putting separate files together. Select the PDFs you need, arrange them in the right sequence, and create a single document from your browser. You can also sort files by name or use A4 formatting when combining documents with different page sizes. Rather than sending your files to a cloud service, klzth performs the merge locally in your browser. This keeps the workflow lightweight and gives you more control over documents that may contain private information. There is no software to install, no account to create, and no watermark on your output. Three merges are free each month, with optional one-time packages of 30 merges for $5.50 or 100 merges for $9.90. klzth keeps one simple PDF task simple.