Split PDF
Extract specific pages, split every page individually, or divide your PDF in half.
Merge PDF
Combine multiple PDFs into one document. Drag to reorder before merging. Free, no signup, up to 200MB per file.
3 free operations remaining today
Drop your PDFs here
or click to browse — select multiple files at once
Browse files
How to Merge PDF Files
Smart PDF Lab merges multiple PDFs into a single file in four steps.
- 1
Upload your PDFs.
Drop your PDF files or click Browse files to upload documents up to 200MB each.
- 2
Reorder the files.
Drag and drop the files to arrange them in your preferred sequence.
- 3
Click Merge.
Smart PDF Lab combines the PDFs into one document.
- 4
Download the result.
Save your merged PDF directly to your device.
Why Merge PDFs With Smart PDF Lab
Smart PDF Lab is the fastest free PDF merger for combining contracts, reports, scanned documents, and invoices into one file. Reorder pages with drag and drop before merging.
Combine an unlimited number of files in a single session, with no daily limits or signup required. Each file can be up to 200MB. The output preserves original page quality, embedded fonts, and document metadata.
What the PDF Merger Supports
- PDF versions — Merges all common PDF versions from PDF 1.4 to PDF 2.0.
- Content types — Accepts files containing text, images, scanned pages, embedded fonts, and form fields.
- Document structure — Preserves bookmarks, hyperlinks, and document structure where possible.
- Optimization — Optimizes output PDFs for smallest size without quality reduction.
- No file count limit — No limit on the number of files combined per merge operation.
Frequently Asked Questions
How many PDFs can I merge at once?
Smart PDF Lab does not limit the number of files per merge. Each individual file must be 200MB or smaller.
Can I reorder pages before merging?
Yes. Drag and drop your uploaded files to reorder them. The final merged PDF follows your chosen sequence.
Are my files safe during merging?
Yes. Files upload through HTTPS-encrypted connections, process on our servers, and auto-delete the moment your merger completes.