裁剪 PDF
免費·無需註冊·檔案永不離開你的裝置
How to crop a PDF in 3 steps
Cut away dead white space and edge artifacts with measurements you control, not a lasso guess.
Upload the PDF
Drop your document in the box above — it opens locally, instantly.
Set the margins
Enter how much to trim from each side in mm or inches, and confirm against the live preview.
Download the cropped file
Click Crop PDF. The trimmed document downloads right away.
Why crop PDFs with AmiPDF
Exact, repeatable trims — the same numbers across a whole document.
隱私優先
處理完全在你的瀏覽器內完成。不上傳、不儲存、不外傳——絕不。
無需註冊，無浮水印
無賬號、無郵箱、無限制。輸出檔案與輸入完全一致。
Preview before you commit
See the crop boundary over a real page before applying anything, so there are no surprises in the output.
任何裝置可用
Windows、Mac、Linux、Android、iOS 上體驗一致——無需安裝。
When to crop PDF pages
Scans with oversized borders, slides exported with letterboxing, printouts with scanner edges — cropping tightens all of them. A trimmed page also prints larger content on the same paper.
Cropping runs entirely on your device, so private documents stay private.
Crop PDFs on any platform
AmiPDF 在你的瀏覽器中執行——無需安裝、無需配置、無需更新。
Windows
Chrome, Edge, Firefox
macOS
Safari, Chrome
Linux
Any modern browser
iOS
Safari on iPhone, iPad
Android
Chrome, Samsung Internet
Frequently asked questions
Does cropping delete the content outside the box?
Cropping sets the visible page area — the standard, lossless way to trim PDFs. Some advanced editors can still see the underlying layer, so don't rely on cropping alone to redact secrets; use a dedicated redaction tool for that.
Can I crop just some pages?
Yes. Apply the crop to all pages or type a range like 1-5 when only a section needs trimming.
Which units can I use?
Millimeters and inches. Values are exact, so the same crop applies uniformly across pages.
Will cropping make my file smaller?
Slightly at most — the page definition shrinks, but the underlying content is preserved. Cropping is about layout, not compression.
Can I undo a crop later?
Your original file stays untouched on your device, so you can always start over from it.
Is cropping uploaded to a server?
No. The crop is computed and written locally in your browser.
相關 PDF 工具
繼續——處理 PDF 所需的其他工具，全部免費、全部本地執行。