PDF Merge
Joins two PDFs into one file in upload order (lossless page-level copy via pdf-lib, no re-rendering, text stays selectable), up to 200 pages combined.
First PDF (pages come first)
Second PDF (appended after)
How to merge PDFs
- 1Upload two PDFs: the first provides the leading pages, the second is appended after.
- 2Click 'Convert Now' and wait for the conversion to complete.
- 3Download the merged single PDF file.
About PDF Merge
PDF merging meets requirements for scenarios such as combining contract originals with attachments, merging multiple segmented scanned documents into a complete file, and combining report covers with main text for distribution. Splitting and merging are complementary operations for processing within the PDF format.
This tool uses a page-by-page copying mechanism powered by pdf-lib for processing, without re-rendering pages. Text layers and vector content are retained as-is. After merging, pages from the primary document are placed first, and pages from secondary documents are appended in order. The maximum total page limit is 200 pages. Bookmarks and form fields are not migrated with pages.
The upload order of files corresponds to the final page order. Encrypted PDF must be decrypted before upload and processing. The maximum single file size is 50MB. The file size of the merged output equals the sum of the sizes of the two uploaded files, which can be used to estimate the final output size.
FAQ about PDF Merge
How are pages ordered after merging?
After merging, pages from the primary document are placed first, and pages from secondary documents are appended in their original order. The upload order of files determines primary/secondary document assignment, which matches the final page order.
Are bookmarks and form fields preserved?
This tool uses a page-by-page copying mechanism that only migrates page content. Bookmarks and form fields are not migrated during merging, so bookmarks and form fields from the original documents cannot be preserved.
Is there a single file size limit?
This tool sets a size limit for single files. Single files may not exceed 50MB, and only one merge operation is processed per request. Files exceeding the limit will be rejected.
Are uploaded files stored?
Files are uploaded to the server via HTTPS for conversion. After conversion completes, the server immediately deletes both source files and output files, no storage is performed, and file content will not be leaked.