PDF Merge

What is PDF Merge?

Combine any number of PDFs into a single document, in the order you choose. Useful when you have receipts, scans, bank statements, or chapters as separate files and need one clean PDF to upload or attach. Handles PDFs up to 100 MB each, preserves page content and layout exactly, and runs entirely in your browser so no file ever leaves your device.

How do I use PDF Merge?

1. Drop multiple PDFs onto the upload zone, or click to browse.
2. Reorder the files with the ↑ and ↓ buttons until the sequence is right.
3. Click Merge PDFs.
4. Click Download to save the combined PDF.

PDF Merge by the numbers

Engine

pdf-lib, in-browser

Max per file

100 MB

Max files

Unlimited (memory-bound)

Preserves

Pages, layout, fonts, images

Drops

Bookmarks, form fields, signatures

Common use cases for PDF Merge

• Combining a cover letter, CV, and portfolio into one application PDF.
• Merging three invoices into a single proof-of-purchase document.
• Assembling chapters from separate PDFs into one bound e-book.
• Stapling together scanned receipts for a monthly expense report.
• Joining a signed contract with its annexes into a single archive file.

Common pitfalls and how to avoid them

• Bookmarks disappear after merge — pdf-lib does not carry document-level bookmarks across. If bookmarks are critical, merge with a desktop PDF editor (Acrobat, PDF Expert) or add fresh bookmarks after merging.
• Form fields stop working — Interactive form fields are dropped during merge. Flatten forms before merging (a PDF print-to-PDF loop works) or re-add the fields after.
• File order is wrong — Drag the items in the list to reorder before hitting Merge — the output follows the visible order.

When should I use PDF Merge?

PDF Merge is the right tool when you want one continuous document. If instead you want to break a PDF into smaller files, use PDF Split. To pull out specific pages and discard the rest, use PDF Extract Pages.