klzth（ https://www.klzth.com/ ） is a simple and secure online PDF merging tool that lets you combine multiple PDF files directly in your browser. No uploads, no account registration, and no watermarks. Easily arrange files, merge documents, and preserve original text quality and image clarity. With optional A4 page resizing and flexible file ordering, klzth makes PDF merging fast, convenient, and privacy-friendly. Enjoy free merges and affordable one-time licenses with no subscriptions.
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