A PDF merger combines multiple PDF files into a single document while preserving all page content, images, and formatting. Useful for assembling reports, combining scanned pages, or packaging related documents together.
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Merge Summary
Add at least 2 PDF files to begin
Files never leave your browser
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How to Merge PDF Files
Merging PDFs is one of the most common document tasks — combining a cover letter and resume, assembling a multi-section report, or packaging invoices with receipts. This PDF merger handles it entirely in your browser, so your files stay private.
Step 1: Add Your PDF Files
Click "Browse Files" or drag PDFs directly onto the drop zone. You can select multiple files at once using Ctrl+click (Windows) or Cmd+click (Mac) in the file picker. Files are listed in the order they were added.
Step 2: Reorder If Needed
Drag the file entries in the list to rearrange them. The final merged PDF will contain pages in the order shown — first file's pages first, then the second file, and so on. Use the X button to remove any file you don't want to include.
Step 3: Merge and Download
Click "Merge PDFs". The tool uses the pdf-lib JavaScript library to copy all pages from each input file into a new PDF document. A progress indicator shows which file is being processed. When complete, the browser downloads the merged file as merged.pdf.
Performance and File Size
The PDF merger works well for files up to about 100MB total combined size. Larger merges may slow down because the browser holds all file data in memory simultaneously. If you need to merge very large files, consider splitting the merge into two steps: merge the first half of files, then merge that result with the second half.
FAQ
Are merged PDFs stored anywhere?
No — all merging happens in your browser using JavaScript. Files are never sent to any server. When you close the tab, the files are gone.
How many PDFs can I merge at once?
There's no hard limit on file count, but combining very large files (100MB+ total) may slow down or run out of browser memory. For best performance, keep total combined size under 100MB.
Does merging preserve bookmarks and hyperlinks?
The merger preserves page content, images, and text. Bookmark navigation (table of contents) is not preserved in this version, but all page content is fully intact.
Can I reorder the files before merging?
Yes — drag the files in the list to reorder them before clicking Merge. The output PDF will contain pages in the order shown.
What if one of my PDFs is password protected?
Password-protected PDFs cannot be loaded by the browser. Use the PDF Unlock tool first to remove the password, then merge.