Is there a limit on how many PDFs I can merge?

You need at least two. Large stacks are limited by upload size and the PDF backend timeout. For very large packs, merge in batches, then merge the batches.

Will Merge keep form fields fillable?

Treat merged output as a new file. Interactive forms often flatten. If you need a fillable packet, fill first, flatten on purpose, then merge.

What if one file is password-protected?

Decrypt that file first, then merge. Inspect will show encryption on a locked source.

Pdf Tools

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Merge

Combine multiple PDFs into one

PDFs to merge (min 2)*

Drop files here or click to browse

PDF files only