Combining PDFs is one of the most common day-to-day office tasks — you have three scans, two receipts, and a signed contract and you need to send them as a single document. The Rankato PDF Merger does exactly that in seconds: drop files, drag to reorder, download. Every operation runs client-side using pdf-lib, so your PDFs never touch a server. That matters when the files contain contracts, financial records, or anything else you'd rather not upload to a stranger.
Reorder before you merge
File order in the sidebar becomes page order in the output. Drag rows up and down, or use the arrow buttons for finer control. Click any row to see a page-by-page preview and remove specific pages before combining — useful when you have a 30-page scan and only need pages 5–12 merged with another document.
Format compatibility
Accepts any standard PDF — PDF 1.4, 1.5, 1.6, 1.7, and PDF/A. Password-protected PDFs are supported if you provide the password; otherwise the tool warns and skips. Files with embedded fonts, images, forms, and annotations all merge correctly with their content preserved. The output is a valid PDF 1.7 that every PDF reader (Acrobat, Preview, browser viewers) opens without issue.
Output size and performance
Merged output size is roughly the sum of input sizes. Combining ten 5 MB PDFs produces a ~50 MB result — pdf-lib doesn't recompress content, only concatenates. Need a smaller result? Run the output through the Compress PDF tool afterward. Processing time for typical merges is 1–3 seconds per file on a modern laptop; larger scanned PDFs take longer because they carry more embedded raster data.