Merge PDF
Process, convert or edit PDF files client-side using this free online Merge PDF tool.
Drag & drop file here or click to browse
Browser sandbox: files are processed client-side. We never store your data.
Technical Overview & Key Specifications
Merge PDF is a 100% free, browser-based online utility developed by FuaHub (Guangzhou Nuobao Intelligent Technology Co., Ltd.). Process, convert or edit PDF files client-side using this free online Merge PDF tool. All computations run strictly inside your local browser memory sandbox with zero server uploads.
- Execution Sandbox
- 100% Client-Side (WebAssembly / HTML5)
- Server Data Upload
- 0 Bytes (Zero-Knowledge Local RAM)
- Access & Pricing
- 100% Free, No Login or Watermark
- Platform Compatibility
- Windows, macOS, Linux, iOS, Android (Offline Ready)
How to Merge PDF Files Online (Free & Instant)
- Click the upload zone or drag and drop multiple PDF files into the area.
- Use the ▲ ▼ arrow buttons to reorder the PDFs in the exact sequence you need.
- Click "Merge PDF" to combine all files. The unified PDF downloads automatically in seconds.
Why FuaHub PDF Merger Stands Out
- Unlimited Files: Merge 2, 10, or 50+ PDFs in a single operation with no page count limit.
- 100% Client-Side: Uses the pdf-lib engine locally in your browser. Your files never touch our servers.
- Drag-to-Reorder: Intuitively rearrange file order before merging to get the exact document structure you need.
Privacy & Data Security guaranteed
We understand that PDF documents often contain confidential invoices, contracts, or academic assets. Therefore, our PDF tools are designed entirely client-side. All processing runs locally in your browser. You can even use the tool offline with complete privacy.
FAQ
Q: Can I merge more than 2 PDF files at once?
A: Yes, you can add and merge an unlimited number of PDF files in a single session. Simply keep uploading until you have all the files you need.
Q: Is my PDF data uploaded to a server?
A: No. All merging is performed locally inside your browser using WebAssembly and pdf-lib. Your files never leave your device, ensuring complete privacy.
Q: Will the merged PDF preserve fonts, images, and formatting?
A: Yes. We use direct page-tree copying rather than re-rendering, so fonts, images, and layouts are preserved perfectly in the output file.
Q: Is there a file size limit per PDF?
A: We recommend individual files under 50MB for optimal performance. Very large high-resolution PDFs may take longer to process depending on your device.