Combine multiple PDF files into a single document entirely in your browser. This tool runs 100% locally client-side using pdf-lib, so your files are never uploaded to a server.
Key Features of Merge PDFs
- Drag-and-Drop Sequencing Rearrange the order of your files easily using interactive touch-friendly thumbnail row handles.
- No File Count Limits Merge any number of documents together without hitting capped limits or premium subscription paywalls.
- Page Order Integrity Preserves nested bookmarks, layouts, and page structures safely inside the compiled container.
- Browser-Only Merging Zero network activity; file assemblies occur within local Javascript memory, protecting confidential records.
Merge PDFs Examples
Consolidating Tax Folders
Combine separate IRS pages, W2 scans, and expense statements into a single uploadable document.
Input
CoverPage.pdf, Receipts.pdf, Taxes.pdfOutput
TaxPortfolio_Combined.pdfHow to Use Merge PDFs
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1. Upload PDF Files
Click 'Add PDFs' or drag multiple PDF files onto the upload area. All selected files will be queued for merging.
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2. Reorder the Files
Drag and drop the file entries to set the order in which the PDFs will be merged.
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3. Merge and Download
Click 'Merge PDFs & Download' and the tool will combine all files into a single PDF and prompt you to save it.
Common Use Cases for Merge PDFs
- Mortgage Applications Assemble bank statements, ID cards, and pay stubs into a single clean PDF before sending to brokers.
- Ebook Compilations Combine individual chapters or title sheets into a complete digital ebook.
- Legal Case Assemblies Merge separate briefs, affidavits, and evidence files into structured legal packets.
The Technical Details
The Merging tool runs purely client-side using pdf-lib. When files are loaded, the browser reads each PDF as an ArrayBuffer. pdf-lib parses these buffers in parallel threads, extracting underlying page nodes without uncompressing standard raster streams.
It then constructs a new target document node and recursively copies individual pages from each source dictionary. Finally, the consolidated tree is serialized into a standard byte stream, allowing instant local download triggers using local Blob URLs.
Frequently Asked Questions
How many PDFs can I merge at once?
You can merge as many PDFs as you need. Processing time depends on the total number of pages and your device's memory.
Is page order preserved?
Yes. Pages within each PDF are preserved in order, and the PDFs are merged in the sequence you arrange them in the list.
Are my PDFs uploaded to a server?
No. All merging is done locally in your browser using pdf-lib. Your files never leave your device.
Can I merge password-protected PDFs?
Password-protected PDFs cannot be merged directly. Use the Unlock PDF tool first to remove the password, then merge the unlocked files.