Merge PDF
Combine multiple PDFs into one unified document.
How to Use Merge PDF
- Upload your file: Drag and drop your file into the active processing area above, or click the box to browse your device files.
- Configure settings: Select your preferred options (such as target file size in KB, compression level, page order, or output format).
- Process locally: Click the primary action button. Your file is rendered and encoded in seconds directly inside your browser memory.
- Download output: Click Download to save the modified document back to your device. No watermarks are added.
Zero-Cloud Privacy Guarantee
Unlike legacy web utilities that upload your sensitive documents to remote servers, PDFtiny executes 100% of processing inside your local browser using WebAssembly. Your files never leave your computer, ensuring complete privacy, enterprise compliance, and offline availability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Processing Engine | Client-Side WebAssembly (WASM) & HTML5 File API |
| Server Transmission | 0 Bytes Uploaded (100% Local Browser Memory) |
| Device Compatibility | Chrome, Safari, Firefox, Edge, Android, iOS, Windows, Mac, Linux |
| Compliance | ISO 32000-2:2020, GDPR Article 25 (Privacy by Design) |
Frequently Asked Questions
How many PDF files can I merge at once?
PDFtiny has no artificial limit on the number of PDF files you can merge. You can combine 2, 10, or 50+ PDFs in one session. The only practical limit is your device\
Can I rearrange the page order before merging?
Yes. After uploading multiple PDFs, you can drag and drop individual pages from all documents into any order you want before clicking Merge. You can also rotate individual pages and delete pages you don\
Do merged PDFs lose quality or formatting?
No. PDFtiny uses pdf-lib for native PDF merging, which combines files at the document structure level — not by rendering to images. Text sharpness, embedded fonts, vector graphics, and resolution are all preserved perfectly.
Can I merge password-protected PDFs?
You need to unlock password-protected PDFs before merging. Use PDFtiny\