Merge PDF Files Online Free

Drag and drop your PDF files into the upload box. Arrange the file cards in the order you want them to appear, then click 'Merge PDF'. Your merged document is assembled in seconds and available for instant download.

Yes. Our visual merger lets you drag and reorder documents into any sequence. You can also preview thumbnails and remove any accidental duplicates before creating the combined file.

Our engine preserves existing document outlines and bookmarks. Each merged document retains its original bookmark tree, automatically nested under top-level chapter nodes in the combined PDF.

Yes. Our merger supports mixed page dimensions and orientations. A4 portrait, US Letter landscape, and custom page sizes coexist seamlessly without clipping or distorting content.

If any uploaded PDF is password-protected, you will be prompted to enter the password to unlock it in memory so our engine can extract and merge its pages into the new document.

Standard form fields are retained. However, because cryptographic digital signatures seal a specific file hash, combining files invalidates previous digital signatures; signatures should be reapplied to the final merged document.

You can merge up to 20 files in a single batch with a total combined size of up to 90 MB and thousands of cumulative pages with fast cloud processing.

No. Merging performs lossless byte-level recombination of page streams and objects. Text vectors, high-resolution photographs, and embedded fonts remain 100% unaltered.

No. All merging operations occur in temporary sandboxes. Files are permanently deleted immediately after your combined PDF is generated and downloaded.

Yes. The merge tool is fully responsive and runs smoothly inside mobile Safari, Chrome, and Firefox browsers on any smartphone or tablet.