Merge PDF files online

Combine multiple PDF files into one organized document. Arrange the files in your preferred order, merge them securely in your browser, and download the finished PDF.

Your PDF files are processed locally in your browser and are not uploaded to Looty Tools.

How to merge PDF files

1. Choose or drag multiple PDF files into the tool.
2. Arrange the files in the order they should appear.
3. Review the selected files and remove any you do not need.
4. Select Merge & download.
5. Download the combined PDF.

Combine and organize PDFs

• Merge multiple PDF documents into one file.
• Reorder files with Move up and Move down before merging.
• Remove files before processing.
• Preserve the page order within each source PDF (file-level order only).
• Download one combined PDF.
• Browser-only processing — files stay on your device.

Private browser-based PDF merging

PDF merging happens locally on your device. Your documents are not uploaded to Looty Tools, stored on our servers, or sent to an external conversion service.

Limits and important notes

• Maximum of 20 PDF files per merge.
• Maximum size per PDF is 25 MB.
• Maximum combined size of all selected files is 50 MB.
• At least 2 PDF files are required to merge.
• Password-protected and encrypted PDFs are not supported.
• Digital signatures may become invalid after files are merged.
• Bookmarks, forms, annotations, links, or advanced PDF features may not always be preserved.
• Large or complex PDFs may use more browser memory.
• The output follows the selected file order. Existing source-page content is not edited individually.

Related PDF tools

• Split PDFExtract selected pages or separate a PDF into multiple files.
• Images to PDFConvert JPG, PNG, WebP, and HEIC images into a single PDF.
• Organize PDFReorder, rotate, duplicate, or remove pages from a PDF.
• PDF to JPGConvert PDF pages into downloadable JPG or PNG images.
• Add Page NumbersAdd customizable page numbers to any PDF document.
• PDF EditorAdd text, signatures, drawings, and shapes to a PDF in your browser.

Merge PDF FAQ

Are my PDF files uploaded?

No. Merging runs locally in your browser.

Can I change the order of the PDF files?

Yes. Arrange the files before merging to control the order in the finished PDF.

Can I merge more than two PDF files?

Yes. You can merge up to 20 PDF files, with each file up to 25 MB and a combined total of 50 MB.

Can I remove a file before merging?

Yes. Remove any selected file before starting the merge.

Are password-protected PDFs supported?

No. Encrypted and password-protected PDFs are unsupported.

Will the pages inside each PDF remain in order?

Yes. Each source PDF keeps its existing internal page order.

Can I reorder individual pages?

Use the Organize PDF tool to reorder individual pages inside a document.

Will digital signatures remain valid?

Usually not. Creating a merged PDF may invalidate digital signatures.