Merge PDF
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Merging a PDF means combining two or more separate PDF files into a single document. The pages of each source file are placed one after another in a chosen order, producing one file you can share, print, or archive as a unit instead of juggling several attachments.
At a Glance
1 Credit
Per Merge
On-Device
Processing
25 MB
Free File Limit
500 MB
Pro File Limit
Key Facts
LittlePDF Merge PDF runs entirely client-side in the browser using the pdf-lib library, so files are never uploaded to a server.
Merging copies pages from each source PDF without recompressing them, preserving original text and image quality.
Each merge costs 1 credit; free accounts receive 500 credits per day and can merge files up to 25 MB, while Pro raises the limit to 500 MB per file.
How to Merge PDF in 3 Steps
Drop two or more PDFs into the upload area, or click to browse for them.
Use the up and down arrows on each file card until the order matches the document you want.
Click Merge and the combined PDF downloads to your device.
Why Merge PDF with LittlePDF?
The merge runs in your browser with pdf-lib, so confidential documents are never uploaded anywhere.
You set the file order with a pair of arrows on each card, so the result reads the way you intend on the first try.
Pages are copied, not recompressed, which keeps text selectable and images at full resolution.
One credit per merge against a daily pool of 500 credits means routine merging costs you nothing in practice.
Features
Reorder With One Click
Every file you add becomes a card with an up arrow and a down arrow. The merged PDF follows that top-to-bottom order exactly, so assembling a multi-part document is a matter of nudging cards into place, not renaming files.
Stays on Your Device
pdf-lib reads and writes the PDFs locally in the browser. No upload step, no server queue, no copy of your file sitting in someone else's storage after you are done.
Lossless Joining
Source pages are copied into the new file as-is. There is no re-rendering pass, so a merged document is as crisp as the originals it came from.
Frequently Asked Questions
Last updated: August 2026