Merge PDF files

About this tool

Join simple PDF documents in your chosen file order, without rasterizing their pages.

Supported input

PDF

Output format

PDF

Batch size

Up to 5 files; format and combined limits below still apply.

How it works

1. Add Simple PDF 1.x files in Input. Review each thumbnail and its validation status.
2. Select and order the documents in Input. Every page is appended in that order.
3. Create the selected files. Compare original and result, then download an individual file or ZIP. Changing settings marks older results out of date.

Supported files and limits

Up to 5 PDFs, 5 MiB each and 25 MiB combined, with at most 100 input pages combined and 1000 objects per document. This initial version requires simple, unencrypted PDF 1.x with classic cross-reference tables. Forms, annotations, bookmarks, tags, signatures, scripts, attachments and compressed object tables are rejected. This avoids silently discarding features the current tools cannot preserve. Page contents are copied without rasterizing; document-level metadata is reset.

Preview images are document summaries, not rendered pages. Download and inspect every output page. One worker runs at a time, with a 30-second deadline, cancellation and a 20 MiB per-output limit. Splitting produces no more than 5 PDF parts in a ZIP.

A practical example

Place a simple cover PDF before another simple PDF, then merge them. The output follows Input order and retains the page order inside each admitted file.

Troubleshooting this tool

A locked, signed, annotated or structurally unsupported PDF is rejected. A merge is not signature preservation or document sanitization; keep the original documents separately.

Can I merge signed or annotated PDFs?

Not in this supported subset. Signatures, annotations, forms and several other advanced document features are rejected rather than silently claiming to preserve them.

Check the actual export

Creates one PDF with all selected pages. Page text and vector content are copied; forms, annotations, bookmarks, tags and other unsupported document features are rejected. Open the download and check every page or cell, its order and content before relying on it. These tools are not a PDF sanitizer or a secure-redaction system.

Files stay in your browser

No file bytes are uploaded. Ordinary work stays in memory. Choosing a “Continue” action saves that result in this browser for up to 30 minutes, so another compatible working tool can use the actual output. Saved workflows are limited to 50 MiB and 20 files; clear them in Output. Expired entries are removed on later tool visits. Clearing references is not a secure-erasure promise.

If a file fails

Check its actual format and the restrictions above. Renaming a file does not convert it. A failed file does not erase successful batch results. If processing times out, cancel and try fewer or smaller files. A current browser with worker canvas support is required.

Before you use the download

• Open the output PDF files and verify every page and the requested page order or selection.
• Keep the source PDFs separately; a page operation is not secure redaction or preservation of unsupported signatures or forms.

Tools that accept this output

These links use this tool's default output format, subject to each next tool's supported variants and limits. If you change the export format, use Continue in Output to see compatible actions for the actual result. Opening a link below starts another tool without transferring a file.

• Extract PDF pages — Save selected pages from a simple PDF into a new document in the order you enter.
• Rotate PDF pages — Rotate all or selected pages of a simple PDF by 90, 180 or 270 degrees clockwise.
• Split PDF into parts — Split a simple PDF into equal-sized page groups and download the actual PDF parts in a ZIP.

Need help with this operation? Contact Pro Edit Tools Support with a non-sensitive description of the problem.