Frequently Asked Questions

No, the viewer works for Asp.Net only, supports .NET Framework 4.0+ and .NET Standard 2.0+. However, using a SDK license you can export a document to PDF within a WinForms, Console App, or WebService.

Yes, Asp.Net MVC document viewer.

Yes, Asp.Net document viewer.

Yes, .NET Core document viewer.

Yes, Blazor document viewer.

Yes, it does.

Yes, Amazon AWS S3, Azure Storage, Google Cloud, DropBox, Redis.

Yes, but there is no sample code for Vue. You can refer the Angular sample.

Yes, but please note that you can do this via a mobile browser, not as a native app.

IE 8.0 and above. All modern desktop and mobile browsers. However, we encourage you to check our online demo links from your required devices & browsers.

Asp.Net, MVC, .NET Core: DOC, DOCX, ODT, XLS, XLSX, ODS, CSV, PPT, PPTX, ODP, PDF, VSD, MPP, TIF, XPS, PSD, DWG, DXF, DGN, EML, MSG, TXT, RTF, XML, EPUB, SVG, JPG, JPEG, BMP, GIF, PNG, HTML, MHT, DICOM.

HTML & DICOM are not directly available with .NET Core. You can export to PDF and then view. You can also try your own file.

No, you will not need to install anything on server or client side. Except any special fonts used.

Yes, it can be used for PDF conversion i.e. export. However it requires a SDK license.

Yes, ODT, ODS and ODP.

Yes, please download the free PdfJs pdf document viewer from Download page.

Yes, you can.

We will issue a temporary license to you, till you decide your final domain name.

Yes, you can view from a physical path, stream or from a URL.

No, your files/information are secured inside your premises and there are no calls made to our servers at any point.

No, our product is a viewer. However you can add annotation and save them to PDF.

Yes, the PDF format does support clickable links. Word and other formats can be converted to PDF. Refer samples and documentation for more details.

Dutch, English, French, German, Italian, Portuguese and Spanish.

We provide email support (24 hours turn-around time) and free product updates for 1 year. You can however extend this. We do not provide phone or priority support.

Yes, there are many samples to get you started and a detailed PDF manual and an integration guide.

No.

No.

No. For large excel use SplitWorksheets as true in config.
You may also refer custom Excel viewer sample.

Yes. Use DefaultRender as false in config.

No.

Yes. You can convert them to JPG or PNG, using Magick.NET and then view.

No.

No. Please email us your questions.

Yes. Please email us.

You can change the ImageResolution to lower values (150, 100 or less; default is 200).
There is a trade off between quality and speed. You can set AutoLoadPages to true, then the control will load pages beforehand.
Another option for frequently viewed files is to export them to .DCN (see viewer.aspx sample) and then view the .DCN instead of the original file.

Please refer to AutoClose, TimeOut properties of the control and the WebFarm samples.

Please make sure you have kept the license file in the bin folder.
Next, set the DebugMode property to true and then reload your page.

Please make sure you have all the fonts used by your document installed on the server.
The viewer will not be able to match the original document 100%.

Please check if there is a load balancer or a web farm set up with multiple worker processes.
In that case, you need to refer to the WebFarm sample solution.
You may also check the timeout of IIS worker process, it is default 20 minutes. You can set it to 0, never timeout.

Please check if you have the handler defined in web.config or if the middleware is added in Startup.cs.
Refer to the Integration Guide provided in the documentation folder.

Please ensure that you have installed all NuGets like SkiaSharp etc. as mentioned in our Docker sample.

Please make sure the plug-in DLLs are present in the bin folder.
Then change the IIS application pool settings to allow 32 bit applications.
Also VC++ Redist should be installed on server.

Please install this specific version of SkiaSharp (2.88.6) from NuGet
and for Linux/Docker install SkiaSharp.NativeAssets.Linux.NoDependencies (2.88.6).

Change the IIS application pool settings to allow 32 bit applications.

You can try opening the file from your own code as byte[] and pass it on to Doconut.
byte[] fileBytes = File.ReadAllBytes(path);

Yes it does, please refer to our Ajax Document Viewer sample to get tips.

No. Doconut is not a SaaS (Software as a Service). It is an on-premise solution, meaning you install it locally on your own servers or cloud infrastructure. Your documents stay under your control, and no data is sent to our servers. This gives you full privacy, security, and control over deployment.

Yes! All Doconut products have a risk free, evaluation version available.

Yes! Our support teams will be glad to assist. We want to ensure there are no bad surprises after the point of purchase.
We provide free support on an online forum maintained by our highly trained development staff.
Whether you have purchased or are still evaluating we will always provide timely, helpful assistance.

You can generate a quote online, in the Purchase Portal.

Our payment terms are Net 0-day which means payment must be received in full before we will issue the license keys.
We cannot provide the license earlier; however, if it's urgent then we can provide a temporary license to use while waiting.

Yes. When you purchase Doconut, it is your responsibility to securely keep a copy of the exact DLL files you received — either via the ZIP download or from NuGet — along with your corresponding license file(s). Each DLL indicates its version, and your license is tied to that specific version range. Doconut will continue to work permanently for the versions your license covers, as long as you retain those DLLs and .lic files. We strongly recommend backing up both to ensure future compatibility even if your upgrade period ends.

Yes, the Doconut license is perpetual — you can use the version you bought forever. However, upgrades (new versions, features, or fixes) are not included perpetually. You can optionally purchase an upgrade plan valid for 1, 2, 3, or 4 years. After that period, you can choose whether to renew for continued updates, or stay on the last version you received.

Access to the license(s) is provided to you only after the successful receipt and processing of your payment.
Once payment is received, a confirmation email will be sent that includes your license and instructions on how to apply it.

Once purchased you can also download your license from the website when logged into your account.

All products are available to download on the Download page.
We do not send physical copies of our software by mail.

No, the binaries are the same, it is the license key that is applied which makes the software run in "production" mode without any limitations.