PDF Toolbox - Merge, Split, Compress Online

Merge, split, compress, rotate, encrypt, decrypt PDF files and more

PDF Operations — Merge, Split, Watermark

PDFs are the standard for cross-device document presentation. This toolbox handles essential PDF operations: merging multiple PDFs, splitting at specific pages, and applying watermark overlays. All operations happen locally in the browser — files never upload to any server.

Merge Strategy

When merging PDFs, page size inconsistency is common. This tool auto-detects mixed page sizes and can normalize to a target size. A4 is recommended for international documents. US Letter is suitable for American audiences.

Watermark Feature

Apply text watermarks for "Draft," "Confidential," or "Under Review" labels. Adjust opacity for draft vs. final document indication. Watermarks are rendered directly on PDF pages and appear in printouts.