Merge PDF — Combine PDF Files Online for Free
Get one clean PDF from any number of files — instantly, in your browser, without uploading to a server. Drag, reorder, merge.
How to merge PDF
- 1Drag PDF files to the upload area or click to browse
- 2Arrange files in the desired order by dragging
- 3Click 'Merge' and wait for processing
- 4Download the merged PDF file
Features
- Merge unlimited number of PDF files
- Reorder files before merging
- Page preview
- Processed entirely in the browser — files are never uploaded to a server
Use cases
- Attach a contract, appendix, and invoice as a single PDF instead of three separate files
- Join odd and even pages output separately by a duplex scanner into one document
- Compile a pitch deck from a cover, slides, and price list into one submission file
Why merge PDFs here instead of other tools?
Complete privacy — files never leave your computer
Most online PDF mergers upload your documents to remote servers. Here everything runs in the browser — your files are processed locally and deleted from memory the moment you close the tab.
No limits on file count or size
Merge two files or fifty — there is no artificial cap. The only limit is your browser's available memory, which handles dozens of typical PDFs without issues.
Lossless merge with full fidelity
Pages are copied as-is: fonts, images, vector graphics, hyperlinks, and form fields are all preserved. No re-encoding means no quality loss, no bloated file sizes.
Common problems
Merged PDF is too large
Use Compress PDF after merging to reduce file size without losing text quality.
Pages from one file appear in the wrong order
Reorder files by dragging thumbnails before clicking Merge.
One source file is skipped
The file is likely password-protected. Remove the protection with Decrypt PDF first, then merge.
FAQ
How many files can I merge?
You can merge any number of PDF files at once. The practical limit is determined by your browser's available RAM — typically dozens of files work without issues.
Is quality preserved when merging?
Yes, merging happens without quality loss. All pages, fonts, images, and vector graphics are preserved in their original form — files are not re-encoded.
Can I merge password-protected PDFs?
No, encrypted PDFs cannot be merged directly. First remove the protection using the 'Decrypt PDF' tool, then merge the files.
Are bookmarks and hyperlinks preserved?
Hyperlinks within pages are preserved. Bookmarks (table of contents) from source files are not currently carried over — the result file will not contain a bookmark tree.
Will the file size change after merging?
The resulting file will be approximately equal to the sum of the originals. If the size is too large, use the 'Compress PDF' tool after merging.
Can I merge PDFs with different page sizes?
Yes. Pages of different sizes (A4, Letter, custom) are all preserved as-is in the merged document. No resizing or normalization is applied.
Can I reorder pages across files before merging?
The order in which you add files determines the order in the merged PDF. Add files in your preferred sequence. To reorder individual pages after merging, use the Organize PDF tool.
Is there a page limit in the merged PDF?
There is no hard page limit. The practical limit is your browser's available memory — most modern computers handle merges of several hundred pages without issues.