About Merge PDF
Merge PDF lets you combine two or more PDF files into one document, entirely inside your browser. There is no upload step, no queue, and no waiting on a remote server. Drop the files in, drag them into the order you want, and export a single, perfectly ordered PDF.
Most online PDF mergers — including iLovePDF, Smallpdf, and Adobe's online merger — send your file to their servers. PDFVibe runs the merge locally with WebAssembly, so confidential contracts, medical records, and tax documents never leave your machine.
Use it when you need to combine bank statements, stitch together scanned chapters, assemble a portfolio, or roll up multiple invoices into a single submission. There are no page limits, no file-size limits, and no daily quotas — your CPU is the only ceiling.
How to merge pdf in your browser
- 01Open the merger
Visit pdfvibe.app/tools/merge — no signup or download needed.
- 02Add your PDFs
Drag files into the drop zone, or click to choose them. Add as many as you like.
- 03Reorder pages
Drag file rows to set the final order. Optionally restrict each file to a page range like 1-3, 5.
- 04Click Merge
PDFVibe assembles the combined document in your browser using pdf-lib. No upload happens.
- 05Download the result
Save the merged PDF to your device. The original files are untouched.
Frequently asked questions
Is there a file-size limit?
No fixed limit. Because the merge runs locally, the only constraint is your device's available RAM. We've tested 500MB+ combined inputs on a laptop.
Are my PDFs uploaded anywhere?
No. Open your browser's Network tab while merging — you'll see zero outbound file transfers. Everything stays on-device.
Can I merge password-protected PDFs?
Unlock them first with /tools/unlock, then merge. We deliberately don't bypass passwords.
Does it preserve bookmarks and links?
Internal links and most bookmarks are preserved. Form fields and digital signatures from the source files may not survive — sign after merging.
Is it really free?
Yes, free with no quotas, no ads, no watermarks. PDFVibe is a static site; processing happens on your machine, so we have no per-request cost.
Most online PDF tools — Adobe Acrobat Online, iLovePDF, Smallpdf — upload your file to their servers, run the operation, then send the result back. PDFVibe runs the same operation in your browser using WebAssembly and pdf-lib. The file never travels anywhere. Open your browser’s Network tab while using Merge PDF and you’ll see no outbound file transfers.