How it works
AES-256 密码、ローカルダウンロード加密ファイル。
AES-256 密码——不アップロード。
🔒 100% Secure & Local: Your documents are processed entirely in your browser and never uploaded to any server.
ここにファイルをドラッグ＆ドロップ
AES-256 encryption runs locally. Choose a password you will remember. Up to 80 MB · 25 files / batch
AES-256 密码、ローカルダウンロード加密ファイル。
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、ローカルダウンロード加密ファイル。
丢失密码无法恢复。 处理 100% 在ブラウザ内オフラインで行われます——ファイルから出ることはありません您的设备。
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.