HTML to PDF Conversion Produces Significantly Larger PDF Fil

[ceipalAdmin]

Hi Spire Team,
We are using Spire.HTML to convert HTML documents to PDF. We have encountered an issue where the generated PDF is much larger than expected.

Scenario

Original html size: 3.8 MB

We convert the html to PDF.

Then we convert that HTML to PDF using Spire.HTML.

Resulting PDF size: 38 MB (approximately 10x larger).

We expected the generated PDF size to be similar to the original, but it has increased significantly.

Questions

Is this expected behavior when converting HTML to PDF?

Does Spire.HTML embed images or fonts without compression?

Is there any option to optimize or compress the output PDF during HTML-to-PDF conversion?

Are there any recommended settings or best practices to reduce the output PDF size while maintaining good quality?

If required, I can also share:


The sample HTML file.

The original HTML (3.8 MB).

The generated PDF (38 MB).

The HTML-to-PDF conversion code.
Files are not uploading because of large files, so open this link for files -

https://ceipalemailverifycom-my.sharepo ... ments&ga=1

Any guidance or recommendations would be greatly appreciated.
Thank you!

[Lisa.Li]

Hello,

Thank you for your inquiry,
Our Spire.PDF provides methods to compress PDF documents, you can test it.
https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Document-Operation/How-to-Compress-PDF-Document-in-C-VB.NET.html
Also, for converting HTML to PDF issue, the link you provided doesn't seem to be public and I can't download it directly. Can you provide a direct download link? That you can send it to my email([email protected] ) so that I can use your test code and documents to reproduce the issue of directly. Thank you in advance.

Sincerely,
Lisa
E-iceblue support team

[ceipalAdmin]

Hi Team,

I have sent you the attachment via email. Please review it and let me know the best solution.


Thanks!
Arun

[Lisa.Li]

Hello,

Thank you for sharing the document via email. I will follow up with you via email regarding the further progress of this issue.

Sincerely,
Lisa
E-iceblue support team