Merge your PDFs
Combine multiple PDF files into a single document, right in your browser.
Drop your files here
Related tools
Merge PDFs without ever uploading them
Merging PDFs is the most common reason people open an online tool, and the most ironic one to upload your files for. With Filzy, every PDF you drop stays in your browser tab. The merge happens via pdf-lib running on your CPU, the resulting document is rebuilt locally, and you keep the originals untouched. Page count, embedded fonts, vector graphics and form fields are preserved as-is. Files are streamed in the order you arranged them on screen, and you can drag-and-drop to reorder before clicking Merge.
Files never leave your device
The merge runs in a Web Worker. We never receive, log or cache the PDFs. The only thing leaving your browser is an anonymous analytics ping if you opted in.
Drag-and-drop ordering
Drop several PDFs, drag the thumbnails to reorder them, then click Merge. The output mirrors that exact sequence.
No quality loss
Merging is a structural operation. Filzy reuses the original page streams without re-encoding anything, so text stays selectable and images stay sharp.
How to merge PDFs with Filzy
- 1
Drop your PDFs
Drag two or more PDFs into the area above, or click to pick them. There is no hard cap on how many you can stack.
- 2
Reorder if needed
Drag the thumbnails left or right to set the final page order. The first file becomes the first pages of the merged document, and so on.
- 3
Click Merge
Filzy reads each PDF, copies its pages into a new document and writes the result. Even with 10 large PDFs the operation usually finishes in a few seconds.
- 4
Download or chain another tool
Save the merged PDF, or send it straight to Compress PDF, Sign PDF or Watermark PDF. Files passed between tools also stay local.