🖼️ PDF 图片提取（导出 PDF 里的所有图片）PDF Image Extractor
把 PDF 里嵌入的图片逐张提取出来：按原始像素尺寸导出为 PNG（保留透明）或 JPG，自动去掉重复出现的图片（如每页的 Logo），可跳过小图标、只提取指定页，支持加密 PDF，可单张下载或打包 ZIP。全部在浏览器本地完成，文件不会上传。Extract the images embedded in a PDF one by one, at their original pixel size, as PNG (transparency kept) or JPG. Images repeated on many pages, such as a logo, are removed automatically, tiny icons can be skipped and you can limit it to certain pages. Password-protected PDFs are supported, and you can download images one by one or as a ZIP. Everything runs locally in your browser; files are not uploaded.
使用说明与常见问题How-to & FAQ
「PDF 图片提取（导出 PDF 里的所有图片）」是什么？What is the PDF Image Extractor tool?
把 PDF 里嵌入的图片逐张提取出来：按原始像素尺寸导出为 PNG（保留透明）或 JPG，自动去掉重复出现的图片（如每页的 Logo），可跳过小图标、只提取指定页，支持加密 PDF，可单张下载或打包 ZIP。全部在浏览器本地完成，文件不会上传。Extract the images embedded in a PDF one by one, at their original pixel size, as PNG (transparency kept) or JPG. Images repeated on many pages, such as a logo, are removed automatically, tiny icons can be skipped and you can limit it to certain pages. Password-protected PDFs are supported, and you can download images one by one or as a ZIP. Everything runs locally in your browser; files are not uploaded.
如何使用「PDF 图片提取（导出 PDF 里的所有图片）」？How do I use the PDF Image Extractor tool?
选择或拖入 PDF，提取出的图片会列在下方；可只提取指定页、跳过小图、选择 PNG 或 JPG 并去掉重复图片，每张图旁有「下载」按钮，也可「全部下载（ZIP）」。加密的 PDF 先输入密码并点「打开」。Choose or drop a PDF and the extracted images are listed below. You can limit it to certain pages, skip small images, choose PNG or JPG and remove duplicates; each image has a Download button, or use "Download all (ZIP)". For an encrypted PDF, enter the password and click Open first.
提取出来的图片是原图吗？Are the extracted images the originals?
图片按 PDF 中存储的原始像素尺寸导出，不是截图，也不会按页面显示尺寸缩放。PDF 里的图片会先被解码（JPG、JPEG 2000、Flate、CCITT 等压缩方式都支持，透明蒙版会合成为透明通道），再保存为你选择的格式：PNG 与解码后的像素完全一致，但原本是 JPG 的照片存成 PNG 会更大；选 JPG 则体积小，但会再压缩一次。Images are exported at the pixel size stored in the PDF — not screenshots, and not scaled to how they appear on the page. Each image is decoded first (JPG, JPEG 2000, Flate, CCITT and other compressions are supported, and soft masks become transparency), then saved in the format you choose: PNG matches the decoded pixels exactly, though photos that were JPG inside the PDF get larger; JPG is smaller but compresses once more.
“去掉重复图片”和“小图”有什么用？What do Remove duplicates and Small images do?
很多 PDF 每一页都放着同一个 Logo、页眉装饰或水印，勾选“去掉重复图片”后，像素完全相同的图片只导出一次。“小图”可以跳过宽或高小于指定像素的图片，比如项目符号、细线和小图标，默认跳过 16 像素以下。结果旁会说明跳过了多少张。Many PDFs repeat the same logo, header graphic or watermark on every page; with Remove duplicates, pixel-identical images are exported only once. Small images skips anything narrower or shorter than the size you choose — bullets, rules and tiny icons; by default images under 16 px are skipped. The status line says how many were skipped.
为什么有的 PDF 提取不到图片？Why are no images found in some PDFs?
只有嵌入的位图图片才能提取。文字、表格、图表和用矢量绘制的插图（例如从 Word、PPT 导出的形状和 SVG 图形）在 PDF 里不是图片，所以提取不到；如果要保存这些内容，请用「PDF 转 PNG」把整页转成图片。扫描版 PDF 的每一页通常就是一张大图，可以直接提取。Only embedded bitmap images can be extracted. Text, tables, charts and vector illustrations (such as shapes and SVG graphics exported from Word or PowerPoint) aren't images inside a PDF, so there's nothing to extract — use PDF to PNG to save whole pages instead. In a scanned PDF each page is usually one big image, which can be extracted directly.
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.
有哪些选项可以调整？What options can I adjust?
「PDF 图片提取（导出 PDF 里的所有图片）」的设置：「打开密码」可留空；「只提取这些页（留空 = 全部）」可留空；「小图」可选 全部、跳过 16 像素以下、跳过 32 像素以下、跳过 64 像素以下、跳过 128 像素以下（默认 跳过 16 像素以下）；「格式」可选 PNG（无损，保留透明）、JPG（体积小）（默认 PNG（无损，保留透明））；可勾选：「去掉重复图片」（默认勾选）；可选文件：PDF。每次生成结果都按当前设置处理。Settings in the PDF Image Extractor — "Password" optional; "Pages (blank = all)" optional; "Small images": All sizes, Skip under 16 px, Skip under 32 px, Skip under 64 px, Skip under 128 px (default Skip under 16 px); "Format": PNG (lossless), JPG (smaller) (default PNG (lossless)); tick boxes: "Remove duplicates" (on by default); files: PDF. The result always uses the current settings.
「PDF 图片提取（导出 PDF 里的所有图片）」免费吗？需要注册吗？Is the PDF Image Extractor free? Do I need an account?
「PDF 图片提取（导出 PDF 里的所有图片）」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 Image Extractor is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.