工作原理
AES-256 密码，本地下载加密文件。
AES-256 密码——不上传。
🔒 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
AES-256 encryption runs locally. Choose a password you will remember. Up to 80 MB · 25 files / batch
AES-256 密码，本地下载加密文件。
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).
AES-256 密码，本地下载加密文件。
丢失密码无法恢复。 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.