Merge PDF
Combine up to 20 PDF files into one document, in your order.
- Free
- No signup
- Files stay in your browser
Browser onlyYour data never leaves this device.
Runs entirely in your browser. Your documents never leave this device and are never stored.
Details: Privacy policy
Input
PDF only · 10 MB per file · up to 20 files · 50 MB combined
Drop files here or Browse
Drag and drop works here too.At least 2 PDFs, up to 20 files and 50 MB combined. Order matters.
Result
No merge yet.
Add at least 2 PDFs, arrange them, then merge. Nothing is uploaded.
Merge PDF combines multiple distinct PDF documents into a single unified file in the exact sequence you choose, solving the common dilemma of submitting multi-part paperwork to portals, clients, or print services that demand a single attachment. Unlike Reorder PDF Pages, which rearranges individual pages inside an existing single document, Merge PDF connects separate independent files—such as contracts, appendices, cover letters, and scanned records—into one coherent compilation. Every page retains its original vector text, font definitions, and layout clarity rather than rasterizing into fuzzy images. Built-in validation checks every file up front, enforcing a clear boundary of up to twenty files, ten megabytes per individual file, and a combined fifty-megabyte ceiling. Any corrupted or password-protected PDF triggers an explicit warning naming the exact file instead of omitting it silently, while interactive form fields and signatures flatten safely into static pages. Everything executes entirely in client-side WebAssembly and memory via pdf-lib, ensuring your sensitive agreements never touch remote servers.
Key facts
- Input
- Two or more PDF files
- Output
- One combined PDF
- Limits
- Accepts at least 2 and at most 20 PDF files per merge operation. Individual files cannot exceed 10 MB, and total combined file size must stay under 50 MB.
- Processing
- In your browser — nothing is uploaded
- Sign-up
- Not required
- Cost
- Free
Limits above are read from the same code that enforces them; formats are the ones the tool accepts and produces.
How to use Merge PDF
- Select or drop between 2 and 20 PDF files into the upload box (up to 10 MB each, 50 MB combined).
- Review the chosen documents list to verify file signatures and check for any reported errors.
- Use the up and down arrow buttons next to each file to arrange the exact merge sequence.
- Remove any invalid or unnecessary documents before initiating the processing stage.
- Click Merge PDFs and monitor the reading and page-assembly progress.
- Download the merged PDF file or use the clear button to reset the workspace.
What you get
- One PDF containing every file you added, in the order shown in the list.
- A warning naming any encrypted file that was rejected, rather than a silent omission.
- A stated limit of twenty files and fifty megabytes combined per merge.
When to use Merge PDF
- Assemble scanned chapters into one submission file.
- Join exported reports into a single archive document.
- Assemble an application pack - form, statement, identification - into the single file a portal accepts.
Jobs you can do with Merge PDF
Frequently asked questions about Merge PDF
Does Merge PDF upload my documents to any server?
No. Every file is read, inspected, and merged entirely inside your browser using pdf-lib; no byte is ever transmitted to an external server or stored anywhere.
What are the maximum file and size limits for merging?
You can combine between 2 and 20 PDF documents in a single job, with a maximum of 10 MB per individual file and an overall combined cap of 50 MB.
How does Merge PDF handle password-protected or corrupt files?
The engine tests each document for a valid PDF signature. Encrypted or damaged files are flagged with a prominent warning naming the affected document rather than silently skipped.
How does this tool differ from Reorder PDF Pages?
Reorder PDF Pages rearranges pages within a single PDF document, whereas Merge PDF takes multiple separate PDF files and stitches them together into one unified file.
Are digital signatures and interactive forms retained after merging?
No. Interactive form widgets, AcroForms, and cryptographic digital signatures are flattened into static page graphics to guarantee document structure consistency.
Guides that compare Merge PDF
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