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PDF Merger — Free Online Tool

Combine multiple PDFs into one file

Merge multiple PDF files into one. Free, fast, browser-based. No uploads to any server.

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Free PDF merger — combine multiple PDFs, browser-based

Toololis PDF Merger combines multiple PDF files into one, entirely in your browser. Drag to reorder, then merge with one click. Powered by the open-source pdf-lib library. Your PDFs are never uploaded.

How to use this tool

  1. 1

    Add your PDF files

    Drop multiple PDFs or tap to browse. They appear as a reorderable list.

  2. 2

    Reorder if needed

    Drag the ≡ handle on each item to change the order. The final PDF keeps this sequence.

  3. 3

    Click Merge

    Files merge in your browser. A download link for the combined PDF appears instantly.

Common merge scenarios

  • Receipts and invoices — Combine into one monthly expense report
  • Scanned documents — Merge multi-page scans into a single PDF
  • Contract packages — Combine contract + NDA + appendix into one deliverable
  • Meeting handouts — Merge agenda + slides + notes into one file
  • Academic papers — Combine references, figures, and manuscript

Frequently Asked Questions

Are my PDFs uploaded anywhere?
No. Merging happens entirely in your browser using the pdf-lib library. Your documents never leave your device. Safe for contracts, medical records, tax returns.
What's the file size limit?
Practical limit is around 200 MB total (all files combined), depending on your device RAM. For massive PDFs, process in chunks.
Can I merge encrypted / password-protected PDFs?
No — encrypted PDFs must be decrypted first. Open in a PDF viewer that lets you "export" or "print to PDF" as an unencrypted copy, then merge.
Do bookmarks and form fields survive?
Bookmarks: yes. Form fields: typically yes, but complex interactive forms may lose some styling. Signatures will be invalidated (expected — the document has been modified).
What happens to page size differences?
Each PDF keeps its original page sizes. The merged PDF can have mixed page sizes — A4, Letter, Legal all coexist.
Is there a limit on number of files?
Tested with up to 50 files. No hard limit, but browser may slow with large counts.

Key Takeaways

  • PDF Merger is a free, browser-based pdf tool — combine multiple pdfs into one file.
  • No signup, no downloads, no file uploads — your data stays on your device.
  • Works on desktop, tablet, and mobile. Install as a PWA for offline access.

How to Use PDF Merger

  1. Open the tool: Launch PDF Merger on Toololis — no account or download needed.
  2. Enter your data: Paste text, enter values, or select a file directly in your browser.
  3. Get instant results: Everything is processed locally — results appear immediately.
  4. Copy or download: Save your output or share it. Bookmark for quick access next time.

PDF Merger — Quick Facts

Price
Free — no limits, no watermarks, no paywalls
Privacy
100% browser-based — no data is sent to any server
Platform
Any modern browser on desktop, tablet, or mobile
Category
PDF Tools on Toololis
Offline
Works offline after first visit (Progressive Web App)
FeatureDetails
ToolPDF Merger
CategoryPDF
Signup RequiredNo
File UploadNone — processed in browser
Mobile SupportFully responsive
CostFree forever

Why Use PDF Merger?

You should try PDF Merger for a quick, private way to combine multiple pdfs into one file. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.

On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.

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100% Privacy. This tool runs entirely in your browser. Your data is never uploaded to any server.