Merge / Split PDF

Merge: first-page previews in a horizontal strip — drag cards to set merge order. Split: optional “Load page previews” then drag thumbnails (four per row, scrollable) to reorder pages before splitting by ranges or every N pages; ranges use preview slot numbers when previews are loaded. Zip when multiple parts. Client-side pdf.js + pdf-lib — max ~35 MB per file, 150 pages, 12 PDFs for merge.

pdfmergesplit

Category: File Conversion & Handling

Merge and split run entirely in your browser. Encrypted PDFs are not supported. Merge: reorder source PDFs on the left; on the right drag individual pages to interleave or reshuffle before download. Changing which PDFs you added or their left-to-right order resets the page strip to match.

Drop multiple PDFs

Up to 12 files

Merge mode

Select two or more PDFs, arrange the order with move up/down controls, then merge into a single document. Each source file’s pages are appended in sequence. The same page-count and file-size limits apply as other client tools to protect browser stability.

Split mode

Either describe 1-based ranges separated by commas — each comma group becomes its own PDF, for example 1-3,5,8-10 produces three files — or choose “every N pages” to slice the document into equal chunks. If more than one PDF is produced, the tool wraps them in a ZIP archive with sensible filenames.

Frequently Asked Questions

Are form fields or bookmarks preserved?

pdf-lib focuses on page content when copying pages; advanced PDF features may not be preserved exactly. Review merged or split output before archiving.

Is there a server round-trip?

No. Merge and split logic runs entirely in your browser.

Tips

Quick guidance for using our tools safely and effectively.

Privacy

Files are processed on the server for conversion only and are not used for training or shared with third parties.

Best results

Use the formats suggested in each tool. Large media files may take longer — keep the tab open until processing finishes.

Need something else?

Browse related tools below or explore other categories from the main Dev Tools hub.

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