壓縮 PDF
告訴我們您的平台實際要求的大小限制——NSP、CUET、DU CSAS、JOSAA，或您自訂的確切數字——我們會將檔案壓縮到限制以內。
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.
為什麼是「目標大小」而不是滑桿？
大多數壓縮工具都要您猜測一個品質等級，然後祈禱結果符合要求。如果您有明確的限制——獎學金申請平台、入學表格、考試上傳規定——直接告訴我們數字更快，也真正解決您的問題。
如果無法達到目標大小怎麼辦？
掃描檔或照片較多的 PDF 壓縮空間很大。純文字 PDF 本身已經很精簡，壓縮存在極限——我們會盡量接近您的目標，並如實告知結果，而不是假裝成功。
壓縮 PDF 時會上傳我的檔案嗎？
不會——壓縮完全在您的瀏覽器中使用 WebAssembly 進行。您的檔案絕不會離開您的裝置，也不會經過任何伺服器。
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.