How to Merge PDF Files

Merging PDFs is the cleanest way to deliver multiple documents as a single file. Recipients don't have to open and close several attachments, reviewers can scroll through one continuous document, and the file structure stays consistent across email, cloud storage, and printouts.

Common use cases include combining signed contract pages with the original agreement, assembling a portfolio of design samples, stitching together lecture notes from different days, or merging bank statements from multiple months into a single financial record.

Merging is also useful before sharing: one file is easier to track, harder to lose, and more professional than a zip archive of loose PDFs.

Open the Merge PDF tool in any modern browser. You don't need to install anything or create an account.

Drag your PDF files into the upload area, or click to browse and select multiple files at once. Hold Ctrl (Windows) or Cmd (Mac) to select multiple files in the file picker.

Reorder the files by dragging them within the upload list. The file at the top of the list will become the first pages of the merged PDF; the file at the bottom becomes the last pages.

Click the Merge PDFs button. The tool reads each file, copies its pages into a new combined PDF, and produces a single output file. This typically takes a few seconds for files under 50 MB total.

Click Download to save the merged PDF. The output is a standard PDF with no watermark, no metadata added by this tool, and the original page sizes preserved.

Before merging, think about the logical flow of the final document. If you're combining a cover letter, resume, and portfolio, the cover letter should be first. If you're assembling a multi-section report, arrange sections in the order they'll be read.

Mixed page sizes work fine — letter, A4, legal, and tabloid pages can all coexist in a single PDF. Most PDF readers handle this gracefully, displaying each page at its native size. However, if you plan to print the merged document double-sided, try to keep page sizes consistent to avoid printing headaches.

If a source PDF has bookmarks or a table of contents, those internal links do not always transfer cleanly to the merged file. For long merged documents, consider adding a fresh table of contents at the start of the merged PDF after the fact.

PDFs with an owner password (which restricts editing but allows viewing) usually merge without issue. PDFs with a user password (which requires a password to open) must be decrypted first — open them in a PDF reader, save a copy without the password, then merge the copy.

Scanned PDFs merge the same way as any other PDF. The merged file is still a valid PDF; the scanned pages simply become part of the larger document. If you want to make the merged file smaller, run it through the Compress PDF tool after merging.

Form fields in source PDFs may or may not transfer cleanly. If your source PDFs contain fillable form fields, check the merged output carefully — sometimes the field data is preserved, sometimes the fields appear empty.