Are my PDF files uploaded to a server when I merge them?

No. All merging happens entirely within your browser using pdf-lib. Your files are read locally, combined in browser memory, and the resulting merged PDF is downloaded directly to your device without any network transfer of file content.

Can I merge password-protected PDFs?

Not directly. pdf-lib cannot read encrypted PDF content. You must first remove the password from each protected PDF using the PDF Decrypt tool, then merge the unlocked versions. Attempting to merge a still-encrypted PDF will result in an error or garbled output.

Is there a limit to how many PDFs I can merge at once?

There is no enforced file count limit, but the browser's available RAM sets a practical ceiling. Very large PDFs or a high number of files may exhaust browser memory. If merging fails or the browser becomes unresponsive, try merging files in smaller groups and then combining the intermediate results.

Will bookmarks and hyperlinks from the original PDFs be preserved?

Internal hyperlinks within each document are generally preserved, but document-level bookmarks (outlines) from individual files are not automatically merged into a combined outline in the output PDF. If you need a unified bookmark structure, you would need to add those manually using a full PDF editor after merging.

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FreeNo Upload

PDF Merger

Merge multiple PDF files into one document. Secure and private — no upload to servers.

imageImg→PDF mergeMerge call_splitSplit compressCompress lockEncrypt lock_openDecrypt water_dropWatermark text_snippetTo Text table_viewTo CSV descriptionPDF→Word picture_as_pdfWord→PDF

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Upload PDF files

Drag & drop · Multiple files · PDF

How to Use

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Upload your PDF files

Select two or more PDF files to combine. Drag to reorder them in the file list — the first file becomes page 1 of the merged document.

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Arrange the page order

Drag and drop files to set the merge order. Remove any files you don't want included. Preview the file count and total pages before merging.

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Merge and download

Click Merge to combine all PDFs into a single document. The merged PDF downloads automatically with pages in your specified order.

What is PDF Merger?

PDF merge tool combines multiple PDF files into a single consolidated document, all processed locally in your browser using pdf-lib. It is the go-to solution for anyone who needs to join contracts, reports, or scanned documents into one cohesive file. Legal professionals, administrators, and students use PDF merging daily to eliminate fragmented document workflows.

Why use PDF Merger?

Unlike cloud services, this browser-based PDF merger keeps sensitive documents entirely on your machine — no file is ever uploaded to a remote server. The drag-to-reorder interface lets you arrange pages in the exact sequence you need before merging, ensuring the final document flows correctly. The resulting merged PDF preserves all original content, annotations, and embedded fonts from the source files.

lockComplete privacy — Your files never leave your device or browser.
boltInstant processing — No wait times, no server queues, no upload delays.
money_off100% free — No subscriptions, no credits, no hidden fees.
person_offNo registration — Start using immediately, no account needed.
devicesWorks everywhere — Any modern browser on desktop, tablet, or mobile.

How it works

An accountant combines a cover letter, financial statements, and appendices into one PDF before sending to auditors. A researcher merges dozens of journal article PDFs into a single reference document for a literature review. A teacher assembles individual assignment PDFs from students into one submission file for grading.

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Pro Tip

If any source PDF is encrypted, decrypt it first using the PDF Decrypt tool before merging — pdf-lib cannot read password-protected content. For very large merges, process files in batches to avoid browser memory limits, then merge the resulting intermediate PDFs.

Frequently Asked Questions

No. pdf-lib performs a document merge that copies page content streams directly without re-encoding or recompressing anything. Text, images, vector graphics, and embedded fonts from the source PDFs are preserved exactly as they were in the originals.

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