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如何将图片转换为 PDF — 支持 JPG、PNG 等格式

已更新 2026年9月1日

将图片转换为 PDF 可以将一张或多张照片打包成一个轻便的文档,方便任何人打开、打印和分享。WhiskFile 支持 JPG、PNG、WebP、HEIC、SVG 和 BMP 等格式,几秒钟即可全部转换为 PDF,无需安装任何软件。

试用 JPG to PDF — 免费在线工具

为什么要把图片转成 PDF?

PDFs are the universal document format. Converting images to PDF is useful when you need to: email multiple photos as one attachment instead of many, create a printable photo booklet or portfolio, submit scanned documents (photos of receipts, IDs, or forms) in PDF format, or archive images in a format that preserves layout across devices.

Unlike sharing raw image files, PDFs maintain consistent page sizing and orientation regardless of the recipient's device or operating system.

如何将单张图片转为 PDF

1. Open the WhiskFile JPG to PDF tool (also accepts PNG, WebP, and other formats).

2. Upload your image by clicking "Choose file" or dragging it onto the upload zone.

3. The tool automatically converts the image and wraps it in a PDF page sized to match the image dimensions.

4. Download the resulting PDF file.

如何将多张图片合并为一个 PDF

1. Open the WhiskFile JPG to PDF tool.

2. Upload all the images you want to combine. You can select multiple files at once or drag them in batch.

3. Reorder the images by dragging them into your preferred sequence.

4. Click "Convert to PDF". All images are combined into a single multi-page PDF, with one image per page.

5. Download the combined PDF.

To further organize the result, use the Organize PDF tool to reorder, rotate, or delete pages after conversion.

我该使用哪种图片格式?

JPG is the most common format for photos. It produces smaller files but uses lossy compression.

PNG is best for screenshots, diagrams, and images with text — it uses lossless compression and preserves sharp edges.

HEIC is the default format on iPhones. WhiskFile converts HEIC to PDF directly — no need to convert to JPG first.

WebP is a modern format used by many websites. WhiskFile handles WebP to PDF conversion natively.

All formats produce identical PDF quality. The choice of input format does not affect the output PDF.

优化输出的 PDF 文件大小

If the resulting PDF is too large (common when converting high-resolution photos), run it through the WhiskFile Compress PDF tool after conversion. This can reduce the file size by 40–70% while maintaining visual quality suitable for screen viewing and standard printing.

常见问题

可以把 iPhone 的 HEIC 照片转成 PDF 吗?
可以。WhiskFile 直接支持 HEIC 文件。上传到“JPG 转 PDF”工具即可,它支持 HEIC、AVIF、WebP、BMP、SVG 及所有常见图片格式。
最多可以把多少张图片合并到一个 PDF 中?
没有硬性的页数限制。主要的限制是文件总大小:免费版 50 MB,Pro 版 500 MB。大多数用户每次合并 10 到 50 张图片都不会遇到问题。
图片质量会降低吗?
不会。图片在转换时会以原始分辨率嵌入 PDF 中,转换过程不进行重新压缩。如果您需要更小的文件,可以在转换后使用“压缩 PDF”工具。
可以设置页面尺寸(如 A4、Letter 等)吗?
默认情况下,PDF 的页面尺寸与图片尺寸一致。如果您需要 A4 或 Letter 等特定页面尺寸,请在转换后使用“调整 PDF 大小”工具来更改页面尺寸。

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