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提取图片 · Extract Images提取 PDF 中嵌入的图片

如何用 PDFnoted 提取 PDF 中嵌入的图片(图文教程)

场景:提取 PDF 中嵌入的图片 / Extract embedded images from a PDF
PDF 文件常含重要图表、Logo 或截图,但无法直接右键保存?PDFnoted 提供一键提取功能,自动识别并导出所有嵌入图片,操作简单、零格式损失,适合学生、设计师和行政人员。
Need to save charts, logos, or screenshots embedded in a PDF? PDFnoted lets you extract all embedded images with one click — no manual screenshotting, no quality loss, perfect for students, designers, and office professionals.
立即使用 提取图片 → Use Extract Images →

1. 上传 PDF 文件

访问 PDFnoted 官网,点击「提取图片」工具入口;拖放或点击选择需处理的 PDF 文件。PDFnoted 支持最大 200MB 文件,无需注册即可使用。

2. 自动扫描并预览图片

PDFnoted 将自动解析 PDF 结构,识别所有嵌入图像(包括 JPEG、PNG、TIFF 等),并在网页端生成缩略图预览列表,支持按页码排序与点击放大查看。

3. 选择并导出图片

勾选需要导出的图片(支持全选/反选/单页筛选),点击「下载为 ZIP」按钮;PDFnoted 会打包所有选中图片,保持原始尺寸与色彩信息,下载后解压即可使用。

1. Upload Your PDF File

Go to the PDFnoted website, click the 'Extract Images' tool; drag & drop or browse to select your PDF. PDFnoted supports files up to 200 MB — no sign-up required.

2. Auto-Scan and Preview Extracted Images

PDFnoted scans your PDF and detects all embedded images (JPEG, PNG, TIFF, etc.), displaying them as thumbnails with page numbers — click any to preview full size.

3. Select & Export Images

Check desired images (select all, invert, or filter by page), then click 'Download as ZIP'. PDFnoted exports them at original resolution and color fidelity — just unzip and use.

小贴士:✅ 提前压缩大图再插入 PDF,可加快提取速度;⚠️ 避免加密 PDF(需先解密);💡 导出后建议用「颜色采样器」核对关键图的 RGB 值,验证是否无损。
Tips: ✅ Compress large images before inserting into PDF for faster extraction; ⚠️ Avoid password-protected PDFs (decrypt first); 💡 Verify color fidelity post-export using an RGB sampler tool.

常见问题

FAQ

PDFnoted 能提取扫描版 PDF(OCR 后的图片)吗?

不能。PDFnoted 仅提取「嵌入式矢量/位图」图片(即作者插入的图片对象),不处理扫描生成的页面级图像。如需提取扫描件中的图,请先用 OCR 工具转为可编辑 PDF。

导出的图片命名规则是什么?

默认按「page_数字_object_序号」命名(如 page_3_object_2.png),确保来源清晰可追溯;ZIP 包内同时包含 CSV 映射表,记录每张图在 PDF 中的页码与位置。

是否支持批量处理多个 PDF?

当前版本支持单次上传一个 PDF,但可连续处理多个文件——上传完成下载后,直接上传下一个,界面自动重置,无需刷新页面。

Can PDFnoted extract images from scanned PDFs?

No. PDFnoted only extracts embedded image objects (e.g., inserted JPEG/PNG). It does not process page-level raster scans. For scanned PDFs, run OCR first to generate an editable version.

How are extracted images named?

Images are named as 'page_X_object_Y.png' (e.g., page_3_object_2.png); a CSV mapping file is included in the ZIP showing exact page number and placement context.

Does PDFnoted support batch processing of multiple PDFs?

PDFnoted processes one PDF per session, but supports sequential batch handling: after downloading, simply upload the next PDF — the interface resets automatically, no reload needed.