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Kerning issues with IronPDF HTML Conversion #6

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DanieleDaccurso opened this issue Nov 26, 2018 · 30 comments
Open

Kerning issues with IronPDF HTML Conversion #6

DanieleDaccurso opened this issue Nov 26, 2018 · 30 comments

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@DanieleDaccurso
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DanieleDaccurso commented Nov 26, 2018 •
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Hi

I noticed that there are some issues with the kerning when converting HTML to PDF using IronPDF. Depending on the font-size, the kerning is faulty. Is there a workaround in order to have it working right?

Here you can see an example:

testtext

And the code used to create exactly this example.

namespace IronPdfTest2
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            var Renderer = new IronPdf.HtmlToPdf();
            var PDF = Renderer.RenderHtmlAsPdf("<h1 style='font-family: calibri;'>Pack my box with five dozen liquor jugs.</h1>" +
                                               "<span style='font-size: 8px; font-family: Calibri'>Pack my box with five dozen liquor jugs.</span> <br>" +
                                               "<span style='font-size: 6px; font-family: Calibri'>Pack my box with five dozen liquor jugs.</span> <br>" +
                                               "<span style='font-size: 4px; font-family: Calibri'>Pack my box with five dozen liquor jugs.</span> <br>");
            var OutputPath = "HtmlToPDF.pdf";
            PDF.SaveAs(OutputPath);
            System.Diagnostics.Process.Start(OutputPath);
        }
    }
}

Furthermore:

  • Using a different PDF reader does not solve the issue
  • Using pt or em for font-sizes instead of px still had various kerning issues
  • The issues seem to be depending on the font-size. Larger fonts tend to have different issues
  • The tests have been made on Windows 10

I found a similar issue in wkhtml2pdf. I don't know if IronPDF uses wkhtml2pdf in the background (or, the webkit engine in general), but if it does, it might be related: wkhtmltopdf/wkhtmltopdf#45
@IronPdf
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IronPdf commented Nov 26, 2018 via email

@nbaranidharan
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Team,
Is there any solution for this issue? Thank you.

@IronPdf
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IronPdf commented May 31, 2019 via email

@ghost
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ghost commented Aug 21, 2019 •
edited by ghost
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We're currently trialling IronPDF for a few projects and seeing this issue too, anyone have any workarounds for it as the files really don't look very professional?

@dradovic
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We are facing the same problem after an upgrade from 5.2.0.1 to 2020.3.2. The kerning of the characters are so bad that we cannot go live with this upgrade.

BTW: we are using "Arial" as a font family and it only appears on Windows 10 and on Azure. However the documents seems to be fine when generated in our CI in a Linux container.

@adbdehghan
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Hey guys we are facing this issue any update on this?

@unruledboy
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unruledboy commented Oct 7, 2020 •
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Same problem here, with latest version, no matter how big the letter-spacing we set, the letters are just overlapping each other.

Had no choice, but downgraded to 2019.8.9. All versions after that have the problem.

@joes0ft
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joes0ft commented Oct 9, 2020

Same kerning issues on Win10 2004 using the latest IronPDF 2020.10.2.
Anybody from IronPDF can help us find a resolution to this problem?

IronPDF_kerning_issues

@adbdehghan
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adbdehghan commented Oct 10, 2020 •
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Same kerning issues on Win10 2004 using the latest IronPDF 2020.10.2.
Anybody from IronPDF can help us find a resolution to this problem?

IronPDF_kerning_issues

I figured it out, You should import the font in your css don't import it like this ->

Screen Shot 2020-10-10 at 4 48 54 PM

just import your font with @import url('https://fonts.googleapis.com/css?family='); and it'll works perfect.

@AIZ-THerring
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2-1/2 years later, and this is still a problem with IronPdf.

In my particular case, the suggestion to use @import isn't helpful because it's a Windows TrueType font on the server (a standard Windows font) where we're seeing the issue.

@dradovic
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dradovic commented Apr 22, 2021 •
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@AIZ-THerring Is it related to the Known Issue listed under https://ironpdf.com/docs/questions/azure/?

For us, all kerning issues disappeared when we switched from Windows to Linux Docker images.

@AIZ-THerring
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AIZ-THerring commented Apr 22, 2021 •
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We are currently looking into Docker as a solution for the web font problem, but it would have to be a Windows image. Our app is in DotNet 4.7.2 and can't be upgraded to DotNet Core because of another dependency it has.

Edit: Let me clarify. We currently can't use Web Fonts because the app is running as an Azure Web App. We're looking into changing the hosting model to a Docker container hosted in an Azure ASP so that Web Fonts will work.

FYI, that link doesn't go directly to an issue. It goes to an empty search result.

@DanieleDaccurso
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DanieleDaccurso commented Apr 22, 2021 •
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Disclaimer: I haven't used IronPDF since creating this issue almost 3 years ago because it was a deal-breaker. Considering the price of IronPDF, this issue was not acceptable.

Changing font made the issue more, or less apparent.
If there is no alternative to IronPDF for your use-case, consider using another font.

@AIZ-THerring
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So far we've discovered that we can tweak the font-spacing in the CSS to make it acceptable. I'm mostly afraid this problem will get fixed and break all of our documents with too much space, so I want it fixed early before we create too many more.

Changing fonts is problematic because we're a large company and the fonts are specified by the Marketing department, and they have to approve all final documents during the implementation process. That's a political battle I'd rather not have to wage.

If you don't mind, could you send me a PM and let me know what you switched to for a solution? We just switched to IronPdf because it seemed to have the best support for Azure of all the PDF processors we were considering.

@DanieleDaccurso
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DanieleDaccurso commented Apr 22, 2021 •
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Same problem for us, big company, corporate identity.

I wasn't aware Github had a PM function. How would I PM you? Sorry I'm not here often

@AIZ-THerring
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My bad. There isn't a messaging system. I thought I'd done it with someone before a year or two ago, but I think I talked with him on an issues list.

@IronPdf
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IronPdf commented May 21, 2021 via email

@IronPdf
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IronPdf commented May 21, 2021 via email

@IronPdf
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IronPdf commented Jul 23, 2021 via email

@IronPdf
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IronPdf commented Jul 23, 2021 via email

@IronPdf
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IronPdf commented Aug 27, 2021 via email

@IronPdf
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IronPdf commented Aug 27, 2021 via email

@NguyenTung103
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image
I followed the request for the new version but the problem is that the error occurs
Error while deploying Chrome dependencies. To learn how to solve this issue please read https://iron.helpscoutdocs.com/article/166-error-while-deploying-chrome-dependencies [Issue Code IRONPDF-CHROME-DEPLOYMENT-ERROR]

@djrecipe
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image I followed the request for the new version but the problem is that the error occurs Error while deploying Chrome dependencies. To learn how to solve this issue please read https://iron.helpscoutdocs.com/article/166-error-while-deploying-chrome-dependencies [Issue Code IRONPDF-CHROME-DEPLOYMENT-ERROR]

IronPdf.Linux v2021.12.4495 works for me using example code like this:

` class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
try
{
IronPdf.Logging.Logger.EnableDebugging = true;
IronPdf.Logging.Logger.LogFilePath = "Default.log";
IronPdf.Logging.Logger.LoggingMode = IronPdf.Logging.Logger.LoggingModes.All;

            IronPdf.Installation.LinuxAndDockerDependenciesAutoConfig = false;
            IronPdf.Installation.ChromeGpuMode = IronPdf.Engines.Chrome.ChromeGpuModes.Disabled;

            //IronPdf.Installation.Initialize();

            var doc = IronPdf.ChromePdfRenderer.StaticRenderHtmlAsPdf("qwewqewqe"); //something happens here
            doc.SaveAs($"{Environment.CurrentDirectory}/{DateTime.Now.Ticks}.pdf"); //this instruction won't be processed if i set breakpoint or use <F10>
                                                                                    //if there no breakpoints - usually it works under docker for a few moments, but falls immediately on test server (debial)
                                                                                    //if there breakpoint (or some other delay) - container still alive, but debug session ruins
                                                                                    //
                                                                                    //same with instance calls (e.g.  var Renderer = new ChromePdfRenderer(); Renderer.RenderHtmlAsPdf..)
                                                                                    //same on net 5.1 and 3.1, using all docker file examples from here - https://ironpdf.com/docs/questions/docker-linux/ (with replaced project name, of course)
                                                                                    //
                                                                                    //under wsl2 have the same result as this: https://github.com/IronPdf/Iron-Pdf-Documentation/issues/6#issuecomment-970092576
                                                                                    //so if this problem was solved - would be appropriate for any recommedations


            Console.ReadKey();
        }
        catch (Exception ex)
        { //unreachable under docker - debug session falls
            File.WriteAllLines($"{Environment.CurrentDirectory}/err_{DateTime.Now.Ticks}.txt", new[] { ex.Message, ex.Source, ex.StackTrace });
        }
    }
}`

Try setting IronPdf.Installation.LinuxAndDockerDependenciesAutoConfig = false;
Docker issues have been largely fixed within IronPdf as of the new releases.

@IronPdf
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IronPdf commented Aug 1, 2023 via email

@IronPdf
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IronPdf commented Aug 3, 2023 via email

@IronPdf
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IronPdf commented Aug 8, 2023 via email

@IronPdf
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IronPdf commented Sep 15, 2023 via email

@IronPdf
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IronPdf commented Mar 8, 2024 via email

@IronPdf
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IronPdf commented Jun 12, 2024 via email

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10 participants
@dradovic @unruledboy @djrecipe @adbdehghan @IronPdf @DanieleDaccurso @nbaranidharan @AIZ-THerring @NguyenTung103 @joes0ft