🎞️ PDF 转 GIF（可合成动图）PDF to GIF Converter
把 PDF 页面转换为 GIF 图片：可以每页一张 GIF，也可以把所有页合成一个循环播放的 GIF 动图（适合把幻灯片、说明书做成动图），可设每页停留时间和分辨率，本地生成。Turn PDF pages into GIF images — one GIF per page, or all pages combined into a looping animated GIF (great for slides and instructions) with a per-page delay and resolution. Generated locally.
使用说明与常见问题How-to & FAQ
「PDF 转 GIF（可合成动图）」是什么？What is the PDF to GIF Converter tool?
把 PDF 页面转换为 GIF 图片：可以每页一张 GIF，也可以把所有页合成一个循环播放的 GIF 动图（适合把幻灯片、说明书做成动图），可设每页停留时间和分辨率，本地生成。Turn PDF pages into GIF images — one GIF per page, or all pages combined into a looping animated GIF (great for slides and instructions) with a per-page delay and resolution. Generated locally.
如何使用「PDF 转 GIF（可合成动图）」？How do I use the PDF to GIF Converter tool?
在「PDF 转 GIF（可合成动图）」中，按需设置「分辨率」、「输出」、「每页停留（秒）」、「页码（留空为全部）」等选项，然后点击「转换为 GIF」、「全部下载（ZIP）」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 PDF to GIF Converter: Set "Resolution", "Output", "Seconds per page", "Pages (empty = all)", then click "Convert to GIF", "Download all (ZIP)". 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.
GIF 动图里每一页是什么顺序？What order are pages in the animation?
按页码顺序（或你在“页码”里填写的顺序，例如 3,1,2）依次播放并无限循环。尺寸不同的页面会等比例缩放并居中到第一页的大小，空白处填白色。Pages play in page order — or in the order you type under Pages, such as 3,1,2 — and loop forever. Pages of a different size are scaled proportionally and centred to the first page's size, padded with white.
为什么 GIF 里文字边缘有色斑？Why do text edges show speckles?
GIF 每帧最多 256 种颜色，抗锯齿的文字边缘和照片会被量化，可能出现轻微色带或噪点。文字为主的页面效果一般很好；需要高保真请用 PDF 转 PNG。GIF allows at most 256 colours per frame, so anti-aliased text edges and photos are quantised and may show slight banding or speckles. Text-heavy pages usually look fine; for full fidelity use PDF to PNG.
为什么分辨率最高只有 150 DPI？Why is the resolution capped at 150 DPI?
默认 72 DPI（每个 PDF 点对应 1 像素，A4 页面约 595×842 像素）。GIF 不压缩得很好，高分辨率的多页动图会非常大（几十 MB），很多聊天软件和网站会拒绝。72–96 DPI 适合在屏幕上播放。The default is 72 DPI (one pixel per PDF point, about 595×842 pixels for A4). GIF compresses poorly, so a high-resolution multi-page animation becomes huge (tens of MB) and many chat apps and websites reject it. 72–96 DPI suits on-screen playback.
中文和特殊字体能正确显示吗？Are Chinese and special fonts rendered correctly?
页面由 pdf.js 渲染，支持嵌入字体、中日韩文字（含 CMap）、透明度和 JPEG2000/JBIG2 图片；未嵌入字体的文件会用相近的标准字体替代，个别排版可能与原软件略有差异。Pages are rendered with pdf.js, which supports embedded fonts, CJK text (with CMaps), transparency and JPEG2000/JBIG2 images. Non-embedded fonts are substituted with similar standard fonts, so rare layouts may differ slightly.
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 转 GIF（可合成动图）」免费吗？需要注册吗？Is the PDF to GIF Converter free? Do I need an account?
「PDF 转 GIF（可合成动图）」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 PDF to GIF Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.