klzth is a lightweight PDF tool built for simple document organization.

It lets you combine multiple PDF files directly in your browser, reorder them, sort files by name, and optionally fit different page sizes to A4. The original PDF pages are preserved during the process, helping maintain text and image quality.

Unlike many online PDF services, klzth does not require you to upload your documents to a remote server. Your files can stay on your device while you work.

There is no account, installation, watermark, or recurring subscription. You can make 3 merges per month for free, with one-time options of 30 merges for $5.50 or 100 merges for $9.90.

klzth keeps PDF merging simple, private, and focused on the task at hand.