Compare pdftk, pdfunite, and browser-based merging
**Command Line Tools** (pdftk, pdfunite, ghostscript): Great for automation and batch processing, but require installation, terminal knowledge, and offer no visual preview. **Online Tools** (PDF Guru): Instant access from any browser, visual drag-and-drop reordering, no installation required. Perfect for occasional use and non-technical users. Our recommendation: Use PDF Guru's online merger for everyday tasks and visual reordering. Use command line tools if you need to automate merge operations in scripts or CI/CD pipelines. **Quick pdftk command:** `pdftk input1.pdf input2.pdf cat output merged.pdf` **Quick pdfunite command:** `pdfunite input1.pdf input2.pdf merged.pdf`