Combine multiple PDF files into a single PDF.
If this tool isn’t working as expected, please take a screenshot of the error and report the problem here so we can investigate and improve it.
Submitting multiple documents as one file is cleaner than sending several separate attachments, and getting the page order right matters as much as the merge itself. Because merging copies each source file's pages directly into the combined document, the result is a straightforward concatenation - identical quality, in whatever order you arrange the files.
This PDF merger combines two or more uploaded PDF files into a single PDF, in the order you arrange them - entirely in your browser, using the client-side pdf-lib library. Your files are never uploaded to any server.
Select two or more PDF files to merge.
Arrange PDFs in the exact order you want.
Combines all selected PDFs into a single file.
Download your merged PDF file.
Use the upload box to add two or more PDF files - you can add more files at any time before merging.
Use the up and down arrow buttons next to each file to move it earlier or later in the list - files merge in the exact top-to-bottom order shown.
Click the trash icon next to any file to remove it from the list before merging.
Click Merge PDFs to combine all listed files into one document, which downloads automatically as "merged.pdf" as soon as merging finishes.
Best For
Input
Uploaded: cover-letter.pdf, resume.pdf, references.pdf (in that order)Output
One merged.pdf file containing cover-letter.pdf's pages, then resume.pdf's pages, then references.pdf's pages, in sequenceThe merged file follows the exact top-to-bottom order shown in the file list at the moment you click Merge PDFs - reorder first if the list isn't already in the order you want.
Upload each scanned page or section as a separate PDF, put them in order, and merge into one document for a portal that requires a single file.
Merge a cover letter, resume, and supporting documents into one deliverable PDF.
Merge individually-saved chapters or sections into one combined document once all pieces are ready.
Problem
Solution
Files merge in whatever order they're listed at the moment you click Merge PDFs - reorder with the arrow buttons first if the upload order isn't the order you want in the final document.
Problem
Solution
Reordering uses the up and down arrow buttons next to each file, not a drag handle.
Problem
Solution
The tool can't open an encrypted PDF - if any file in your selection is password-protected, remove the password first or the merge will fail.
Problem
Solution
If any file in a multi-file selection isn't a PDF, the entire selection is rejected - none of the files in that batch get added, not just the invalid one.
You can upload additional PDFs at any time before merging, then use the arrow buttons to slot them into the right position.
Use the trash icon to drop a file from the list rather than re-uploading everything if you added the wrong one.
A merged file is roughly the combined size of its source files - if it's too large for an email or upload limit, run it through a PDF compressor afterward.
Since encrypted PDFs aren't supported, unlock any password-protected file in another tool before adding it to the merge list.
Files are reordered using up and down arrow buttons next to each file, not by dragging.
The tool can't open encrypted PDFs - any password-protected file needs to be unlocked elsewhere before uploading it here.
Each source file's pages keep their own original size and orientation in the merged output - the tool doesn't resize or rotate pages to make a mixed-format merge uniform.
The merged file contains only the copied page content - document outlines/bookmarks from the source files aren't carried into the combined document.
Merging doesn't compress anything, so the combined file's size is approximately the total of all source files' sizes - run it through a compressor afterward if it needs to be smaller.
There's no artificial limit on how many files or how large they can be, but since everything runs in your browser tab, very large or numerous files are limited by your device's available memory.
Both use the same up/down arrow controls - the difference is just when you use them.
| Reorder Immediately | Add More, Then Reorder | |
|---|---|---|
| Best for | When you already have every file you need uploaded | When you're still adding files and want to slot new ones into place |
| Steps | Upload all files, then arrange with the arrows | Upload some, arrange, upload more, arrange again |
| Result if you skip reordering | Files merge in upload order, which may not match your intended sequence | Same risk - newly added files always append to the end of the list |
Which should you use?
However you build the list, always check the order shown in the file list immediately before clicking Merge PDFs, since that top-to-bottom order is exactly what ends up in the output file.
The two things that matter most when merging PDFs are getting the page order right and keeping your documents private. This tool addresses both: use the up and down arrows to arrange files in the exact order you want before merging, and everything processes locally in your browser - your files are never uploaded to any server.
Yes. This PDF Merger processes your files entirely in your browser using the client-side pdf-lib library - your PDFs are never uploaded to any server. You can verify this yourself by opening your browser's DevTools Network tab before merging.
There's no fixed file-count or size limit imposed by the tool itself. Since everything processes in your browser, practical capacity depends on your device's available memory - merging many large files in one browser tab can be slow or fail on a memory-constrained device.
Yes. Use the up and down arrow buttons next to each uploaded file to move it earlier or later in the list - the files merge in the exact top-to-bottom order shown.
No. Merging copies each page's original content directly into the combined file without re-compressing or re-rendering anything - text, images, and formatting stay identical to the source files.
No. The tool can't open an encrypted PDF without support for entering its password, so password-protected files need to be unlocked before uploading them here.
Each page keeps its own original size and orientation in the merged file - the tool doesn't resize, rotate, or normalize pages to match each other, so a mix of portrait and landscape or A4 and Letter pages will merge cleanly, just with differently-sized pages next to each other.
Leave your email so we can prioritize similar tools and updates.
Trending tools will appear as visitors explore the catalog.
Your recently visited tools will show up here.