工作原理
上传 PDF，排序，本地合并。
本地将多个 PDF 合并为一个。
🔒 100% Secure & Local: Your documents are processed entirely in your browser and never uploaded to any server.
将文件拖放到此处
Drag file cards to reorder. Expand any card to include or exclude individual pages. Up to 80 MB · 25 files / batch
上传 PDF，排序，本地合并。
Conversions run in your tab with JavaScript — no desktop app required.
Files stay on your device during processing. We do not receive your uploads.
Heavy codecs and AI models run locally via Web Workers and WASM (FFmpeg.wasm, Transformers.js).
上传 PDF，排序，本地合并。
加密 PDF 须先解锁。 处理 100% 在浏览器内离线完成——文件不会离开您的设备。
Yes. This tool is free convert online with no signup. Processing stays in your browser — no uploads.
You control quality settings. Choose higher quality for no quality loss when converting online.
Every conversion runs inside your browser tab using JavaScript and Web Workers. There is no background server queue and no account is required for core tools.
Your files are never uploaded to FreeConvertKit for processing. Originals, previews, and exports stay on your device unless you choose to download or share them yourself.
When codecs or AI models are needed, WebAssembly modules such as FFmpeg.wasm and Transformers.js execute locally — giving you desktop-class power with absolute file privacy.