把 PDF 的每一页渲染成图片（PNG/JPG），打包成 zip 下载。适合做课件截图、文档配图、发社交平台。全部本地渲染。Render every PDF page into a PNG/JPG image and download them as a zip. Great for slides, document illustrations and social posts. All rendered locally.
页数很多或选 3x 清晰度时，渲染会占较多内存，请耐心等进度走完。扫描版式复杂的 PDF 用 2x 一般足够打印和屏幕阅读。Many pages at 3x resolution use a lot of memory — let the progress finish. For most PDFs, 2x is plenty for print and on-screen reading.