Merge PDF
Combine multiple PDF files into one document
Drop your PDFs here or click to browse
Supported format: PDF · Maximum file size: 100MB
What is Merge PDF?
Merge PDF is a free online tool that combines multiple PDF files into a single document directly in your browser. Whether you need to assemble a report from separate chapters, combine scanned documents into one file, or consolidate invoices for archiving, this tool handles it all without uploading your files to any server. Your documents never leave your computer, ensuring complete privacy and security. The merging process uses the pdf-lib JavaScript library to parse each uploaded PDF and copy its pages into a new combined document. This means all text, images, vector graphics, and formatting from the original files are preserved exactly as they appear. You can upload as many PDFs as you need and rearrange their order before merging. The tool supports files up to 100MB each and works on any modern browser including Chrome, Firefox, Safari, and Edge. Since everything runs locally in your browser using WebAssembly and JavaScript, the processing speed depends on your device rather than internet connection. There is no registration required, no watermarks added, and no daily usage limits. Simply drag and drop your files, arrange them in the desired order, click merge, and download your combined PDF instantly.
How to Use
- Upload the PDF files you want to merge.
- Reorder files using the up/down buttons if needed.
- Click the 'Merge' button.
- Download the merged PDF.
Tips & Best Practices
- Arrange your PDF files in the correct order before merging by using the up and down arrow buttons, as the final document follows the listed sequence.
- For very large files or many documents, close other browser tabs to free up memory and ensure smooth processing.
- If you need to merge password-protected PDFs, first use the Remove Password tool to unlock them, then proceed with merging.
- After merging, use the Reorder Pages tool if you need to rearrange individual pages within the combined document.
- Consider compressing the merged PDF afterward using the Compress PDF tool, especially if the combined file is large and needs to be shared via email.
Use Cases
Report Assembly
Combine separate chapters, appendices, and cover pages into a single professional report document.
Invoice Consolidation
Merge monthly invoices or receipts into one PDF for easier bookkeeping and tax preparation.
Application Packages
Combine your resume, cover letter, certificates, and references into a single application file.
Document Archiving
Consolidate related scanned documents, contracts, or correspondence into organized single files for long-term storage.
FAQ
How does PDF merging work?
Upload multiple PDF files and they are combined into one document directly in your browser. No files are uploaded to any server.
Is there a limit on the number of PDF files I can merge?
There is no limit on the number of files, but each file must be under 100MB. Large files may take longer to process depending on your browser's memory.
Can I change the page order after merging?
You can reorder files before merging. After merging, use the 'Reorder Pages' tool to rearrange individual pages.
How does PDF merging technically work?
PDF merging works by copying page objects from each file in order into a single new PDF document. The text, images, and formatting from the original files are fully preserved.
Can I merge PDFs with different page sizes?
Yes, each page retains its original size when merged. You can combine A4 and Letter-sized documents together.
Are bookmarks and links preserved after merging?
Basic page content is preserved, but internal links and bookmarks may shift position after merging.
Can I merge password-protected PDFs?
Password-protected PDFs must first be unlocked using the 'Remove Password' tool before they can be merged.
What is the maximum number of PDFs I can merge at once?
There is no hard limit on the number of files. However, the total combined size should stay within your browser's available memory. For best results, keep the total under 500MB.
Does merging affect the quality of my PDFs?
No, merging preserves all original content including text, images, fonts, and formatting. The pages are copied as-is into the new document without any re-encoding or quality loss.
Can I merge PDFs with different page orientations?
Yes, each page retains its original orientation and size. You can merge portrait and landscape pages together without any issues.
Do I need to install any software?
No installation is required. This tool runs entirely in your web browser. Just open the page and start merging your PDFs immediately.
Is there a daily limit on how many times I can use this tool?
No, there are no usage limits. Since all processing happens locally in your browser, you can merge PDFs as many times as you need without any restrictions.
Will my merged PDF contain any watermarks?
No, the merged PDF is completely clean with no watermarks, branding, or modifications. The output contains only the original content from your source files.