Merge PDF
Combine multiple PDF files into one document. Drag to reorder the files.
Drop PDF files here
or click to browse (max 100MB each)
Max file size: 100MB
100% Private: All PDF processing happens locally in your browser. Your files are never uploaded.
Merge PDF Free Online – Combine PDF Files into One
Merge PDF is a free in-browser tool that combines multiple PDF files into one document without uploading your files. Add as many PDFs as you need, drag them into the order you want, and download a single merged PDF — everything runs locally in your browser with no quality loss.
Why Use TryDocsy PDF Merger?
No Upload Required
All merging happens in your browser. Your PDFs never leave your device.
Multiple Files
Select PDFs up to 100MB each. Batch capacity depends on browser memory.
Drag to Reorder
Drag the file rows to set the order the documents are combined in.
No Account Needed
No account or email address is needed to merge files.
No Quality Loss
Pages are copied directly — no re-encoding, no quality reduction.
100% Free
Merge files without adding a watermark or paying a conversion fee.
Merge PDF joins whole PDF files into a single document, in the order you arrange them, without sending anything to a server. Each file you add is opened straight away with the @cantoo/pdf-lib library so the list can show its real page count, and the running total at the top of the list — “4 files selected (37 total pages)” — tells you what the finished document will contain before you commit to it.
The unit here is the file, not the page: every page of every file goes in, one file after another. That makes it the right tool for assembling a bundle out of documents you already have, and the wrong tool for picking pages out of them. To choose which pages take part, cut them out first with /pdf/split, or drop the ones you do not want with /pdf/delete-pages, then bring the results back here. Ordering is done by dragging the rows up and down, so a mouse or a touchscreen is required.
How it works
1. Add the files
The box reads “Drop PDF files here” and takes several PDFs at once, each up to 100 MB. You can come back and drop more later; the list grows rather than being replaced, and adding the same file twice is quietly ignored.
2. Arrange the order
Each row carries a grip handle, a position number and the file's page count. Drag a row up or down and the numbers renumber as you go. The merged document follows this order exactly, and the trash icon on the right takes a file back out.
3. Press the merge button
The button names the count you are about to combine, as in “Merge 4 PDFs”, and stays disabled until at least two files are in the list. It reads “Merging…” while the pages are copied across.
4. Download the result
Press “Download Merged PDF”. The file is saved as merged.pdf rather than being named after any of the source files, so rename it if you are uploading it somewhere that expects a particular file name.
When you'd use it
Building an application bundle
Recruiters and admission portals often want one PDF holding a photo ID, mark sheets and an experience letter in a stated order. Dragging them into that order here produces exactly the sequence the instructions ask for.
Stitching a scan that came out in pieces
Phone scanner apps frequently save each batch as its own PDF. Adding those parts in sequence rebuilds the complete document without rescanning a single sheet.
Attaching annexures to a main document
A contract, tender response or reply letter usually travels with annexures. Merging keeps the covering document first and the annexures behind it, which is how most offices expect to receive it.
Turning photos into one document
Convert the pictures to PDF with /convert/image-to-pdf first, then merge those PDFs here to get a single file for an email attachment or an upload field that only accepts one document.
Whole files, in list order
Merging works by creating an empty document and appending every page of the first file, then every page of the second, and so on down the list. Nothing is dropped, nothing is reordered inside a file, and no page is re-encoded, so the combined document has exactly as many pages as the counter promised and the visual quality of each page is untouched.
Because pages keep their own dimensions, a merged document can legitimately contain pages of different sizes — an A4 letter followed by a US Letter scan followed by a landscape spreadsheet export. Viewers handle that fine, but a printer may scale some pages to fit. If uniform pages matter, make the source documents match before merging.
One consequence of starting from an empty document is that only page-level content travels. The bookmark outline of a source PDF and the definition that makes a form fillable stay behind. A form you have already filled in should go through /pdf/flatten first so the entered values become part of the page itself.
Files that get skipped or refused
A password-protected PDF cannot be added. It is set aside with a notice naming it, in the form “document.pdf” is password-protected and was skipped, or a count when several are affected, and the notice has its own Dismiss button. Run those files through /pdf/unlock and add the unlocked copies.
A file that is damaged rather than protected produces an error alert quoting the file name followed by the reason. Selecting the same file a second time does nothing at all, which is deliberate: it stops a double-drop from putting the same document into the bundle twice. Remove it with the trash icon and it becomes addable again, which is the way to move a file to a different position if dragging is awkward.
Size, memory and what to do afterwards
The merged file is roughly the sum of its parts, since nothing is compressed on the way through. Four 4 MB scans make a file around 16 MB, which is over the attachment limit of several mail providers and many portals. Running the result through /pdf/compress afterwards is the usual second step.
Each source file is capped at 100 MB by the uploader, and there is no fixed limit on how many files you can line up. The real ceiling is memory: every document is read into the tab and the combined result is assembled there too, so a phone will give up sooner than a laptop. If a very large batch fails, merge in two halves and then merge those two results.
Frequently asked questions
Can I merge only some pages of a file?
Not in this tool — every page of every file is included. Trim the file first with /pdf/split or /pdf/delete-pages, then merge the trimmed version here.
How do I change the order after adding files?
Drag the rows. Each row has a grip handle on the left and a number showing its position, and the merged document follows the list from top to bottom. Removing a file and adding it again also puts it at the end.
Why is the download called merged.pdf?
The result is a new document rather than an edited copy of any input, so it is saved under a fixed name instead of one source file's name. Rename it after downloading if the destination expects something specific.
What happens to a protected file in the batch?
It is skipped and named in a notice above the list, and the merge continues with the rest. Unlock it with /pdf/unlock first if it belongs in the bundle.
Is anything lost when documents are combined?
Page content is copied without re-encoding, so text, fonts and images are untouched. What does not survive is document-level structure: bookmarks and the fillable-form definition are not carried into the merged file.
Why is the merge button greyed out?
It stays disabled until at least two PDFs are in the list, since merging one file would produce a copy of that file. Add another document and it becomes active.
Do the pages end up the same size?
No. Each page keeps the dimensions it had in its own document, so mixing A4, Letter and landscape pages gives a document with mixed page sizes. Standardise the sources first if the bundle has to print uniformly.