工作原理
上传 HEIC 图片，选择质量并下载 JPEG。重编码完全在浏览器内完成——无云端上传。
转换 iPhone 照片以获得通用兼容性。
iPhone HEIC photos. Max 20 files per batch.
上传 HEIC 图片，选择质量并下载 JPEG。重编码完全在浏览器内完成——无云端上传。
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 HEIC 图片，选择质量并下载 JPEG。重编码完全在浏览器内完成——无云端上传。
转为 JPEG 可能丢失透明。不支持动画或多页源。大图在低内存设备上较慢。 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.