Combine PDF: Combine PDF joins PDF files and images into a single PDF. Add PDFs and JPG, PNG or WebP pictures in any mix, drag them into the order you want, and each image becomes a page of its own, the same size as the PDF pages next to it (A4 when there are only images). Use it to put a scanned receipt or a photo of a signed page into the document it belongs to, without converting the image first. FreeAIPDF runs 100% locally in your web browser using WebAssembly. Your files never leave your device, guaranteeing absolute confidentiality, zero subscriptions, and no file size paywalls.
Combine PDF joins PDF files and images into a single PDF. Add PDFs and JPG, PNG or WebP pictures in any mix, drag them into the order you want, and each image becomes a page of its own, the same size as the PDF pages next to it (A4 when there are only images). Use it to put a scanned receipt or a photo of a signed page into the document it belongs to, without converting the image first.
PDF pages are copied as they are, so text stays selectable and images keep their resolution. Web links keep working; bookmarks in the original files are not carried over. JPEG photos go in as they are (only a sideways phone photo is re-encoded once, to stand it upright) and PNGs are stored losslessly; WebP images are re-encoded as JPEG, so transparent areas turn white.
Everything happens in your browser with JavaScript (the pdf-lib library), and nothing is uploaded. Up to 20 files at a time, each up to 100 MB. The result downloads as combined.pdf unless you type another name.
How to use Combine PDF
- 1Click Select files, or drop your PDFs and images onto the page. Use Add more files for the rest.
- 2Drag the files into the order the pages should follow, or use the arrows.
- 3Optionally change the Output file name; it starts as combined.pdf.
- 4Click Combine N files, then download the PDF, named combined.pdf unless you changed it.
Combine PDF Specifications & Privacy Overview
Core technical parameters and security disclosures for Combine PDF.
- Processing Architecture
- 100% client-side, runs in your browser
- Data Transmission
- 0 bytes uploaded; the file never leaves your device
- Usage & Cost
- 100% Free; unlimited daily document processing
- Account Requirement
- Zero sign-up, no email, no payment details
- File Capacity
- Up to 100 MB per file
- Platform Compatibility
- Windows, macOS, Linux, iOS (iPhone/iPad), Android
Why FreeAIPDF vs Cloud PDF Converters
| Security & Capability | FreeAIPDF (Client-Side) | Other Online Converters |
|---|---|---|
| Document Privacy | ✓ 100% Local (0 bytes uploaded) | ✗ Uploaded to external servers |
| Pricing & Limits | ✓ Completely Free & Unlimited | ✗ Daily caps & paid tiers |
| User Accounts | ✓ No signup or email required | ✗ Forces registration |
| Execution Speed | ✓ Instant client-side engine | ✗ Network upload & queue delay |
Technical Architecture & Verifiable Security
Verifiable client-side sandbox execution parameters for enterprise, compliance, and privacy verification:
Frequently asked questions
- How is Combine PDF different from Merge PDF?
- Both join files in the order you set, with the same engine. Combine PDF also accepts JPG, PNG and WebP images and turns each one into a page; Merge PDF takes PDFs only. Combine names the result combined.pdf, Merge merged.pdf.
- Will combining reduce the quality of my documents?
- Not for PDFs: pages are copied, not re-rendered or re-compressed. JPEG images are embedded as they are, except sideways phone photos, which are re-encoded once to stand them upright, and PNGs are stored losslessly. WebP images are re-encoded too, because a PDF cannot hold WebP data.
- Is there any limit on file size?
- Up to 20 files at a time, each up to 100 MB. Everything is held in your browser's memory while the PDF is built, so a long list of large scans can be slow on a phone.