PDF Merge – Combine Multiple PDFs into One Document
Drag and drop multiple PDF files, reorder them as needed, and merge them into a single PDF document. All processing happens directly in your browser using pdf-lib — your files are never uploaded to any server. Fast, free, and completely private.
Upload PDF Files
Drag & Drop PDF files here or click to browse
You can add multiple files at once
Your PDFs stay on your device — they are never uploaded anywhere.
Merged Output
Upload at least 2 PDF files and click "Merge PDFs" to combine them into one document.
Why Use the Tools Oasis PDF Merger?
Tools Oasis offers the fastest, most private way to combine PDF files online. Unlike other tools that upload your sensitive documents to remote servers, our merger processes everything locally in your browser.
Before vs after merging
Combine any number of PDFs in seconds. No upload, no server, no size limit — merged right in your browser.
Private by Design
PDFs are processed in-browser using PDF.js and client-side APIs. Nothing is ever sent to a server.
Browser-Native
Uses built-in browser capabilities for fast, instant processing — no plugins required.
No Limits
No file size quotas, no page restrictions, no watermarks added to your output.
Frequently Asked Questions
01 Are my PDF files uploaded to a server?
No. All PDF merging happens entirely in your browser using the pdf-lib JavaScript library. Your files are never uploaded, stored, or transmitted anywhere — Tools Oasis keeps your documents 100% private.
02 Is there a limit on the number or size of PDFs?
There is no hard limit. You can merge as many PDFs as your browser's memory allows. For very large documents (hundreds of megabytes), performance depends on your device. Most users can merge dozens of files without any issues.
03 Can I reorder the PDFs before merging?
Yes. After uploading your files, you can drag and drop them in the file list to arrange them in any order. You can also use the up/down arrow buttons. The merged PDF will follow the order shown in the list.
04 Will the merged PDF preserve bookmarks and links?
The merger copies all pages with their content, formatting, and embedded images intact. However, interactive elements like bookmarks, form fields, and hyperlinks may not be fully preserved in all cases, as the pages are copied as visual content.
05 Can I merge password-protected PDFs?
Password-protected (encrypted) PDFs cannot be merged directly. You would need to remove the password protection first using a PDF tool that supports decryption, then upload the unprotected files to merge them.
06 What browsers are supported?
This tool works in all modern browsers including Chrome, Firefox, Safari, Edge, and their mobile equivalents. It requires JavaScript to be enabled and uses the File API, which is supported in all browsers released after 2015.
More About PDF Merging
01 How many PDFs can I merge at once?
There is no fixed limit. You can merge as many PDF files as your browser's memory allows. Most users can combine dozens of files without any issues. For very large collections, performance depends on your device.
02 Is the page order preserved when merging?
Yes. The merged PDF follows the exact order shown in the file list. You can drag and drop files or use the arrow buttons to rearrange them before merging. All pages within each file maintain their original order.
03 Are my PDF files uploaded to a server?
No. All merging happens entirely in your browser using the pdf-lib JavaScript library. Your files never leave your device — nothing is uploaded, stored, or transmitted to any server. Tools Oasis is 100% private.
04 Is the PDF merger completely free?
Yes. Tools Oasis PDF Merge is free forever with no limits, no subscriptions, no watermarks, and no hidden fees. You can merge as many PDFs as you need without any restrictions.