🔄 PDF 旋转Rotate PDF
旋转 PDF 页面：一次旋转全部页面、指定页码，或点击缩略图逐页设置 90°/180°/270°，适合修正扫描件方向；只修改页面方向属性，内容和画质不变。Rotate PDF pages 90°, 180° or 270° — all pages, a page range, or page by page by clicking thumbnails. Ideal for fixing scanned documents; only the page orientation changes, content and quality stay the same.
使用说明与常见问题How-to & FAQ
「PDF 旋转」是什么？What is the Rotate PDF tool?
旋转 PDF 页面：一次旋转全部页面、指定页码，或点击缩略图逐页设置 90°/180°/270°，适合修正扫描件方向；只修改页面方向属性，内容和画质不变。Rotate PDF pages 90°, 180° or 270° — all pages, a page range, or page by page by clicking thumbnails. Ideal for fixing scanned documents; only the page orientation changes, content and quality stay the same.
如何使用「PDF 旋转」？How do I use the Rotate PDF tool?
在「PDF 旋转」中，按需设置「角度」、「应用于」、「页码范围」等选项，然后点击「旋转并下载」按钮即可。支持拖放文件。加密的 PDF 选好后会先出现「打开密码」栏和「打开」按钮，输入密码点「打开」后再继续。In the Rotate PDF: Set "Angle", "Apply to", "Pages", then click "Rotate & download". Drag-and-drop files is supported. For an encrypted PDF, a Password field and an Open button appear after you choose it — enter the password and click Open first.
旋转会影响画质吗？Does rotating affect quality?
不会。工具只修改每页的 /Rotate 方向属性，文字、图片都不重新渲染或压缩，文件大小基本不变。No. Only each page's /Rotate orientation entry is changed; text and images are not re-rendered or re-compressed, so the file size barely changes.
可以只旋转某几页吗？Can I rotate only certain pages?
可以：选择“指定页码”输入范围，或选择“点击缩略图逐页设置”，每点一次该页旋转所选角度，缩略图会实时显示方向。Yes: choose Page range and enter pages, or choose Click thumbnails — each click rotates that page by the selected angle and the thumbnail shows the new orientation.
已经旋转过的页面会怎样？What about pages that were already rotated?
新角度会叠加在原有旋转上，例如原来 90° 的页面再顺时针旋转 90° 会变成 180°。The new angle is added to any existing rotation — a page already at 90° rotated another 90° clockwise ends up at 180°.
加密的 PDF 可以处理吗？Can it handle password-protected PDFs?
可以。如果 PDF 需要打开密码，会提示你输入；只有权限限制（无打开密码）的文件会自动打开。输出文件不再带密码，如需加密请使用“PDF 加密”工具。Yes. If the PDF needs an open password you'll be asked for it; files with only permission restrictions open automatically. The output is not password-protected — use the Protect PDF tool if needed.
文件会上传到服务器吗？Are my files uploaded?
不会。PDF 在你的浏览器里用 pdf-lib / pdf.js 处理，文件不会离开你的设备，关闭页面后不留存任何数据。No. The PDF is processed in your browser with pdf-lib / pdf.js; files never leave your device and nothing is kept after you close the page.
「PDF 旋转」免费吗？需要注册吗？Is the Rotate PDF free? Do I need an account?
「PDF 旋转」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Rotate PDF is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.