Merge PDF
Merge PDF Free Online – Combine PDF Files into One
Combine multiple PDF files into one document. Drag to reorder the files.
Merge PDF joins multiple PDF files into one combined document: to reorder pages inside one file use Organize PDF, to cut pages into separate files use Split PDF, and to remove unwanted sheets use Delete Pages. Files up to 100 MB combine locally in your browser with no upload, keeping vector text and image quality.
- Runs in your browser
- Nothing uploaded
- No sign-up
- Free, no daily limits
- 1Add your file
- 2Choose settings
- 3Download
Drop PDF files here
Choose a fileor click to browse (max 100MB each) · nothing is uploaded
100% Private: All PDF processing happens locally in your browser. Your files are never uploaded.
Your file is safe
It is processed inside this browser tab and never uploaded, and it is gone when you close the page.
Good to know
- Drag the file rows to set the order before you merge.
- Each PDF can be up to 100 MB; how many you can join depends on your device's memory.
- Password-protected PDFs need unlocking first.
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.
Last updated
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 (such as 4 files selected, 37 total pages) tells you what the finished document will contain before you commit to it.
The unit here is the whole file, not individual pages: 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. To choose which pages take part, cut them out first with Split PDF, or drop the ones you do not want with Delete Pages from PDF, then bring the results back here. To rearrange pages within a single file rather than join multiple documents, use Organize PDF. If you need to update text or fix typos prior to combining, Edit PDF modifies existing text directly in your browser. 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.
How does document order work when merging PDFs?
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 contain pages of different sizes, such as an A4 letter followed by a US Letter scan followed by a landscape spreadsheet export. Viewers handle that without error, 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 Flatten PDF first so the entered values become part of the page itself.
Why does a PDF get skipped when merging?
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 Unlock PDF 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.
What are the memory and file size limits?
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 Compress PDF 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.
How to merge PDFs on mobile for WhatsApp or email?
Open this page in mobile Chrome or Safari, tap the drop area and pick files from your device storage. Drag them into order, merge, and the combined document saves to Downloads. In WhatsApp, send the file as a Document rather than via Gallery so it transfers without compression.
WhatsApp allows documents up to 2 GB (WhatsApp announcement), so the merged file will almost always go through. Gmail is tighter at 25 MB per message. If you are combining slides with a PDF, turn the slides into a PDF with PowerPoint to PDF first, and run the result through Compress PDF if the recipient is on mobile data.
| Sent through | Largest PDF it takes | Source |
|---|---|---|
| WhatsApp (as a document) | 2 GB | WhatsApp blog |
| Gmail | 25 MB per message, then a Drive link | Gmail Help |
| This tool | 100 MB per input file | TryDocsy |
Source: WhatsApp: 2GB file sharing, checked October 28, 2026
Frequently asked questions
Can I merge only some pages of a file?
Not in this tool, as 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.
Step-by-step guides using this tool
- Merge Scanned Documents into One PDF Under 200 KB for Portals
- Is Smallpdf Safe? Privacy, Cloud Servers, and Client-Side Alternatives
- iLovePDF vs Smallpdf: Privacy, Free Limits, and Zero-Upload Alternatives
- PDF24 and Sejda Alternatives: Zero-Upload Local Processing Explained
- WhatsApp PDF Size Limit, and How to Send Several PDFs as One File