Merge PDF Online — Free & Instant

Combine multiple PDF files into one document. Pick specific pages from each file. Your files never leave your device.

100% Free Pick Pages No File Size Limit Unlocks Locked PDFs Browser-Based
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Drop your PDF files here
or click to browse — select multiple files at once
PDF
Detected order in filenames:
One or more files appear to be duplicates. Remove the extra copy before merging.
Normalize page sizeResize all pages to a uniform size in the merged output
Pages will be scaled to match the size of the first uploaded page, keeping their original aspect ratio.
.pdf
∞
Files at once
0s
Upload wait
0%
Quality loss
Free
Always & forever
Select pages
0 of 0 pages selected
Or paste range:
Click a thumbnail to toggle. Press Esc to close.
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HOW IT WORKS

How to Merge PDF Files Online

Combine your PDFs — or pick exactly the pages you need — in three simple steps.

1

Upload your PDF files

Click the upload area or drag and drop your PDF files. Select multiple files at once. Password-protected PDFs are automatically detected — an unlock field appears on the card.

2

Pick pages and order

By default all pages are included. Click the page count on any card to open a page picker — toggle individual pages or paste a range like "1-5, 8, 10-12". Drag cards to reorder files.

3

Name and download

Type your preferred output filename, then click Merge & Download. Your combined PDF downloads instantly — no server, no wait, no watermarks.

FEATURES

Why SmartApplets Merge PDF?

100% Private by Design

Your PDF files are processed entirely in your browser using pdf-lib. They are never uploaded to any server.

Pick Specific Pages

Don't want every page? Click the page count on any file card — pick exactly which pages go into the merged output.

Inline Password Unlock

Add a password-protected PDF and an unlock field appears on the card. Enter the password, click Unlock — ready to merge.

Zero Quality Loss

Pages are copied byte-for-byte. Fonts, images, links, and formatting are preserved exactly as in the originals.

Unlimited Files — No Caps

Merge two files or two hundred. No daily usage caps, no free-tier limits, no upgrade prompts.

Genuinely Free — No Watermarks

We never add watermarks or branding to your output. Supported by clearly-labelled advertising only.

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FAQ

Frequently Asked Questions

Can I pick specific pages from each PDF?
Yes. Click the page count on any file card (for example "10 pgs") and a page picker opens showing every page as a thumbnail. Click pages to toggle them, or paste a range like 1-5, 8, 10-12 in the range box. Only the pages you select will be included in the merged output.
Is this PDF merger completely free?
Yes. Merging PDFs on SmartApplets is 100% free with no usage limits, no watermarks, and no sign-up required. We are supported by clearly-labelled advertising on the page.
Are my PDF files uploaded to a server?
No. All processing happens entirely in your browser using JavaScript and pdf-lib. Your files never leave your device. You can verify this in Chrome DevTools → Network tab — you will see zero outbound file requests during merging.
Can I merge password-protected PDFs?
Yes. When you add a password-protected PDF, SmartApplets automatically detects it and shows an unlock field on the file card. Enter the password and click Unlock — the file is decrypted in your browser's memory only, never on any server. Then merge as normal.
How many PDFs can I merge at once?
There is no hard limit — you can merge as many PDF files as your browser memory allows. Most modern computers handle hundreds of pages without issue.
Will merging PDFs reduce quality?
No. Pages are copied directly from source files without re-rendering or re-compression. Fonts, images, vector graphics, hyperlinks, and all formatting are preserved exactly as in the originals.
Does merging a PDF change its file size?
The merged PDF will be approximately the sum of the pages you include from each file. If you pick only a few pages from a large PDF, the output will be much smaller than the source.
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