压缩 PDF
告诉我们您所在平台真正要求的大小限制——NSP、CUET、DU CSAS、JOSAA，或您自己的精确数值——我们会将文件压缩到该限制以内。
How it works
1. Upload your PDF. 2. Type an exact target size in KB or MB, or pick Low, Recommended, or Extreme compression. 3. Click Compress. 4. Download the result — everything runs in your browser using WebAssembly, so your file never touches a server.
为什么是“目标大小”，而不是滑块？
大多数压缩工具都需要您猜测一个质量等级，然后祈祷结果符合要求。如果您有一个确切的限制——奖学金申请平台、招生表格、考试上传要求——直接告诉我们具体数字会更快，也能真正解决您的问题。
如果无法达到目标大小怎么办？
扫描件或照片较多的 PDF 压缩空间很大。纯文本 PDF 本身已经很高效，压缩存在一个下限——我们会尽可能接近您的目标，并如实告知结果，而不是假装成功。
压缩 PDF 时会上传我的文件吗？
不会——压缩完全在您的浏览器中通过 WebAssembly 完成。您的文件不会离开您的设备，也不会经过任何服务器。
Does compressing a PDF reduce text quality or make it blurry?
No — compression rasterizes every page into an image, so selectable/searchable text is lost in the process rather than preserved. Scanned or photo-heavy pages look about the same since they were already images. Text-heavy pages get a higher quality floor so the text doesn't turn to mush, but they're still flattened — if you need to keep your text selectable, don't compress that file.
Can I compress a PDF that's already password-protected?
Not directly — remove the password first with a PDF reader that supports it, compress the file, then re-apply protection if you still need it.
What size does your portal actually want?
page.compress.portalTableText
Why portals reject an oversized PDF
page.compress.rejectText
Will I still be able to select or copy the text after compressing?
No. Hitting an exact byte count means every page gets rasterized to an image and re-encoded as JPEG — that's true for a scanned PDF and a text PDF alike. The result looks and prints fine, but the text is pixels, not characters, afterward. If you need the text layer to survive, compress a copy and keep your original.
Does compressing change my page count or delete anything?
No — every page you started with comes out the other side, same order, same count. Compression changes how each page is encoded, not how many there are.
Will links, form fields, or e-signatures survive compression?
No. Compression works by rendering every page to an image and rebuilding the PDF from those images, so anything that isn't visible ink — a hyperlink, a fillable form field, a digital signature object — doesn't come along for the ride. The page looks identical and a signature stamp still shows up as pixels, but the underlying interactive element is gone. If the file needs to stay fillable or the links need to stay clickable, keep your original alongside the compressed copy.