Merge PDF files

Combine PDFs in the order you want with the easiest PDF merger available.

How to Use This Tool

  1. 1Click the upload area or drag and drop multiple PDF files into the dropzone.
  2. 2Rearrange the files into your desired order using the file list.
  3. 3Click the "Merge PDFs" button to combine all files into one document.
  4. 4Download your merged PDF instantly — no email or sign-up required.
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Frequently Asked Questions

Is there a limit on how many PDFs I can merge?▼
You can merge up to 20 PDF files at once. For the best performance, we recommend keeping the total file size under 250 MB to prevent browser memory issues.
Will merging change the quality of my PDFs?▼
No. PDFBuilt uses lossless merging — your pages, fonts, images, and formatting are preserved exactly as they are in the original files.
Do my files get uploaded to a server?▼
Never. All processing happens directly in your browser using JavaScript. Your files stay on your device the entire time — we never see, store, or transmit them.

Why Merge PDFs with PDFBuilt?

Combining multiple PDFs into a single document is one of the most common office tasks — whether you're assembling a report, compiling invoices, or preparing a portfolio. Most online tools require you to upload sensitive documents to their servers, creating privacy risks. PDFBuilt is different: our merge engine runs entirely in your browser using the pdf-lib library. This means your confidential contracts, financial statements, and personal documents never leave your computer. It's the privacy-first approach that professionals in legal, finance, and healthcare have been looking for.

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