PDF Merge
Combine multiple PDF files into one. Fully client-side using pdf-lib.
When do you need to merge PDFs?
Submitting documents to government offices, banks, universities, or HR departments often requires a single combined PDF. You might have your application form as one PDF, your identity document as another, and certificates as a third. Rather than attaching three separate files, a merged PDF is cleaner, easier for the recipient to review, and sometimes required by the upload form itself.
Other common merge scenarios include combining multiple scanned pages into one document, assembling a report from chapters saved separately, or packaging photos and written pages together before sending to a print shop.
How browser-based PDF merge works
ToolJiffy uses pdf-lib, a well-maintained MIT-licensed JavaScript library, to read and combine PDFs directly in your browser. Each PDF is loaded into memory, its pages are extracted in order, and all pages are written into a new combined PDF file. The merge handles standard PDF content including text, vector graphics, raster images, and embedded fonts.
Tips for reliable merges
Remove any password protection before merging. Make sure all files are genuine PDFs, not renamed Word documents. If a merge fails, try adding the files one by one to identify which PDF might be corrupted. The file order shown in the list is the order they appear in the merged output — use the reorder arrows to adjust before clicking Merge.
Frequently Asked Questions
Is there a limit on the number of PDFs I can merge?
There is no hard limit in ToolJiffy. However, merging very many large PDFs can be slow because all files are loaded into browser memory. For most use cases (5–20 files), it works instantly.Are my PDFs uploaded to a server?
No. The pdf-lib library processes every file entirely in your browser. Your PDF data never leaves your device.What happens to encrypted or password-protected PDFs?
Encrypted PDFs will cause the merge to fail. Remove the password protection first using another tool, then merge.Can I reorder pages before merging?
Yes. Use the ↑ and ↓ buttons next to each file to change the order before clicking Merge.Does the merged PDF preserve bookmarks and hyperlinks?
Page content, images, and text are preserved. Some PDF metadata like bookmarks and interactive form fields may not be fully retained by the pdf-lib merge process.Can I remove specific pages from a PDF before merging?
Not in this version. The tool merges full PDFs. Page-level extraction is a future feature.