十页的扫描件不应该是 20 MB。打开一个 PDF，选择 Balanced，我会以合理的解析度重新保存其中的大图 —— 文本依然可选中，链接、表单字段和书签也保持原样。扫描件、图片较多的文档以及从设计工具导出的幻灯片受益最大。共有三个级别：High quality、Balanced 和 Smallest file。在下载之前，你可以看到实际的压缩量；如果 PDF 已经经过充分压缩，我会告知你，而不是给你一个几乎没有区别的副本。文件不会被上传；它永远不会离开你的设备。
A scan of ten pages shouldn't be 20 MB. Open a PDF, keep Balanced, and I save its large images again at a sensible resolution — the text stays selectable, and links, form fields and bookmarks stay exactly as they are. Scans, photo-heavy documents and slide decks exported from design tools gain the most. There are three levels: High quality, Balanced and Smallest file. You see the real saving before you download, and if the PDF is already well compressed I tell you instead of handing you a copy that's barely different. The file is not uploaded; it never leaves your device.
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