Product Guides

How to Render Images with High Resolution from HTML into PDF: Formats, Limitations & Tools

August 31, 2021
Author
Inkit Team

Most documents going through HTML into PDF rendering don’t include images. Invoices, financial statements, bills, medical reports, and other documentation has predominantly textual content. Yet, in some cases, you might need to convert high-resolution images from source HTML to PDF. For example, when you render a digital magazine, generate charts, or create illustrated reports in PDF format.

That’s where you are likely to face problems. High-resolution images take a lot of space and result in difficulties during conversion. They get distorted, have the wrong size, look darker than original images, and cause other issues. It affects the quality and look of the final documents and requires troubleshooting.

The easiest way to fix HTML into PDF image rendering problems is to prevent them. Knowing the formatting demands, limitations, and the most suitable rendering tools, you can easily do that. In this blog post, we invite you to learn how to render images from HTML into PDF.

Image Resolution and Compression: Everything You Need to Know

Resolution means the number of pixels (details) in an image. The higher the resolution, the better quality images have. High resolution exceeds 300 dpi. Anything below is considered low. Remember those blurry photos you've seen online? That was because of the low resolution.

Since HTML into PDF conversion is mainly used for professional purposes, images included in documents usually have high resolution. That’s why when you generate PDFs, they are compressed to optimize the storage and speed up the conversion. Without compression, PDF files would be too big to send by email and take too much space. An uncompressed 1024x768 image would take around 2.3 MB of data.

How to render images right? Remember that image compression is an essential stage of HTML to PDF rendering. You will need to select rendering software that supports high-resolution images and converts them to PDF without losses. It must compress images keeping their look and proportions.

Read How to Convert HTML to PDF Without Errors

image rendering

What Can Happen During the High-Resolution Image HTML into PDF Conversion?

When Inkit worked on the first Render management service, we kept the most common HTML into PDF image rendering issues in mind. Our team asked users about what issues they face when they convert HTML files with images to PDFs. We also analyzed industry-specific forums to know all the vulnerabilities and fix them.

Here are the most common issues that can happen during HTML into PDF conversion:

  • High-resolution images are not rendered when you scale them,
  • High-resolution images start looking gritty after rendering,
  • High-resolution images are not rendered at all since they have too high resolution,
  • High-resolution images are not rendered at all since the HTML into PDF rendering doesn’t support their format,
  • High-resolution images are rendered but take too much space and cannot be used.

These issues are mostly caused by the poor quality of HTML into PDF rendering software and improper formatting. Below, we will share some tips on what to take into account to render high-resolution images easily.

Out-of-the-box PDF generation
The easiest way to automatically generate and manage paperless documents at scale.
Start for free

How to Render Images with High Resolution Smoothly: Format, Limitations, and Online Tools to Use

Not sure how to render a photo or image avoiding the common mistakes? Before initiating HTML to PDF rendering, make sure the online tools you use are suitable for rendering single or multiple high-resolution images. To do this, check out the image formats they support.

Image Formatting

When an HTML source includes images, they can be automatically rendered only if an HTML to PDF converter supports their formats. Otherwise, you will need to complete conversion manually and waste a lot of time.

We recommend using source files in the following formats:

  • PNG
  • SVG
  • JPG
  • GIF (static)
  • APNG (static)
  • BMP
  • TIFF
  • ICO

These formats are the most suitable for HTML into PDF rendering and don’t cause conversion issues. With the right software, you will smoothly convert them into PDF without sacrificing quality.

Image Rendering Limitations

Rendering software and the editing features of Adobe Acrobat aren’t almighty. Hence, you have to put up with some limitations.

First of all, only static images can be rendered. If you have a GIF or APNG in the source file, the animation will be lost in the course of conversion. Hence, it’s better to replace such images with static GIFs and APNGs or use other formats.

The volume of image files converted may be another issue. The conversion of HTML files with many high-resolution images is very memory intensive. Not all converters can handle such a load.

HTML into PF rendering

Automated vs. Manual Rendering Tools

There is no universal rule on how to render a photo or image. You can do it manually, test web browser HTML to PDF converters, or connect an API. The key point is to find the tool that supports the core image formats and high-resolution options like SVG. It should also meet your business needs. If you handle dozens or hundreds of conversions daily, only automated solutions can help.

  • How to render images automatically?

To automate HTML into PDF rendering and image conversion, you need to integrate rendering software with your systems. An API is the most reliable and easy option to do it. With the help of a PDF converter API, you layer automated rendering functionality into your product. After that, you customize conversion using the interface of the integrated rendering solutions to set the values. That’s it. Now the converter will automatically render the necessary HTML files with images into professional-looking PDFs.

Who might need automated image rendering? The main users are large and medium companies that create PDF reports for record-keeping or to provide services. For example, a marketing company that offers website analytics software might need to add images to its PDF reports. Since its software generates thousands of reports every day, automated PDF rendering is crucial.

Discover Styling and Layout Capabilities Offered in an HTML to PDF API

  • How to render images manually?

If you don’t have an HTML to PDF converter or it doesn’t support high-resolution images, you can convert images manually. To do it, open the PDF > Click Add Watermark > Choose the images in the dialog box > Customize the settings > Insert the images. Although these ‘How to render images manually’ steps allow you to convert images, they are only good for one-time conversion.

Overall, professional image conversion requires quality automated software, of course. When a tool was designed for high-resolution rendering, it’s less likely to cause mistakes and ruin the final look of images. If you choose a converter that initially supports high-resolution images like Inkit Render, rendering will be a breeze.

How Inkit Render Simplifies Image HTML into PDF Conversion

Render is an HTML into PDF conversion API provided by Inkit. After you integrate it with your systems, Inkit Render automatically renders HTML web pages into PDF documents.

You won’t face any trouble during conversion since Inkit Render supports SVG, JPG, PNG, GIF (static), TIFF, and other core high-resolution formats. All the images included in the original HTML file will be properly rendered to PDF. Apart from the high-resolution image support, Render allows setting up various user roles and permissions, making it truly unique. You can select the level of access and customize permissions.

Would you like to know more about Render’s capabilities? Contact us for a talk or to get the demo.

Out-of-the-box PDF generation
The easiest way to automatically generate and manage paperless documents at scale.
Start for free