Merge PDF
Select multiple PDF files and merge them into one document. Drag and drop to reorder pages before merging. Everything runs in your browser – your files never leave your device.
Other PDF Tools
About Merge PDF
Need to combine multiple PDF files into one? FastConvert's Merge PDF tool lets you join unlimited PDFs in seconds — completely free, with no sign-up, no watermark, and no file size limits. Simply drag and drop your files, reorder them however you like, and click Merge. Everything runs 100% in your browser, so your documents never leave your device. Whether you're combining reports for work, assembling study materials, or merging scanned pages, our tool handles it quickly and securely.
Frequently Asked Questions
Can I merge PDFs with different page sizes (A4 and Letter)?
Yes. FastConvert preserves each page's original dimensions, so you can merge PDFs of mixed sizes — A4, Letter, Legal, or any custom size — into one document without cropping or distortion.
Is there a limit to how many PDFs I can merge?
No. Unlike Smallpdf or iLovePDF (which cap free users at 2 tasks/day), FastConvert lets you merge unlimited files — no daily limits, no sign-up, no watermark.
Will the merged PDF lose quality or formatting?
No. Merging combines your original pages without re-encoding, so fonts, images, and layout remain pixel-perfect.
Are my files uploaded to a server when I merge?
No. All processing runs in your browser using WebAssembly. Your files never leave your device, ensuring complete privacy and GDPR compliance.