压缩 PDF
缩小扫描件或图片较多的 PDF——选择压缩级别，全程在浏览器中完成。
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如何压缩 PDF
拖入一个 PDF 并选择压缩级别。cutbg 会在你的设备上把每一页重新渲染为压缩后的图片，这能大幅缩小扫描件和图片较多的 PDF。如果文件本身已经很小（以文字为主），cutbg 会提示你，而不会把它变得更大。免费下载，无需上传。
我的 PDF 会被上传吗？
不会——压缩完全在你的浏览器中通过 pdf.js 和 pdf-lib 运行；文件绝不会离开你的设备。
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常见问题
- What kind of PDFs does this shrink best?
- Scanned documents and image-heavy PDFs, where the pages are essentially pictures. It re-renders each page as a compressed image, so those files can drop dramatically in size.
- Will it shrink a text-only PDF?
- Usually not — text PDFs are already compact. If compressing would not make the file smaller, cutbg tells you instead of handing back a larger file. Pick a stronger level for more savings on image PDFs.
- Is my PDF uploaded?
- No — compression runs entirely in your browser with pdf.js and pdf-lib; the file never leaves your device.