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Convert PDF to Image ​

Overview ​

ComPDFKit Conversion SDK provides an API for converting PDFs to images. Integrate ComPDFKit Conversion SDK to your apps to convert PDF into images easily.

Setting Image Formats ​

In ComPDFKit Conversion SDK, supported image formats include:

  • JPG
  • JPEG
  • PNG
  • BMP
  • TIFF

Setting Image Color Modes ​

Supported image color modes in ComPDFKit Conversion SDK include:

  • Color: Color mode, where the image effect is consistent with the original PDF page.
  • Gray: Grayscale mode.
  • Binary: Black and white mode, which applies binarization to the original effect.

Setting Image Scaling ​

The SDK supports setting image scaling. The default scaling is 1.0, which maintains the original PDF page size. If you want to double the image size, you can set image_scaling to 2.0; similarly, to reduce the image size by half, set image_scaling to 0.5.

Enhancing Image Path Display ​

The SDK supports an option called image_path_enhance for enhancing the display of image paths. This option can be enabled when you want to enhance the display effect of paths within the PDF page.

  • Not enable image_path_enhance option(original PDF rendering effect):

    image-20250603162605558

  • Enable image_path_enhance option:

    image-20250603162651769

Notice ​

  • A higher image_scaling value results in images with higher resolution, but it also increases memory usage and slows down the conversion.
  • A higher image_scaling value does not necessarily equate to higher clarity; the clarity also depends on the original image resolution in the document.

Sample ​

This sample demonstrates how to convert from a PDF to Image file.

c++
ConvertOptions opt;
// Convert PDF to Image (JPEG).
opt.image_type = ImageType::e_JPEG;
CPDFConversion::StartPDFToImage("jpeg.pdf", "password", "path/output", opt);

// Convert PDF to Image (PNG) and set image_scaling to double the original PDF size.
opt.image_type = ImageType::e_PNG;
opt.image_scaling = 2.0;
CPDFConversion::StartPDFToImage("png.pdf", "password", "path/output", opt);