How many PDF files can I merge at once?

You can merge up to 20 PDF files in a single job. Upload all your files, arrange them in the order you want, and click Merge.

Is there a file size limit for merging PDFs?

Free users can upload files up to 25 MB each. Pro users get up to 200 MB per file with no limit on total combined size.

No. IdoThePDF merges PDF files losslessly — there is no reduction in quality, resolution, or formatting.

No account is needed. You can merge PDFs instantly without registering. Creating a free account lets you save your job history.

Combine multiple PDF files into a single document. Drag to reorder before merging.

Drop your PDF files here

or click to browse — up to 20 files

Up to 20 files · Max 25 MB per file