If you are evaluating a document viewer for your own application, Doconut.app is the cheapest way to see the rendering before you write any code: it is the free public site running the same engine as the Doconut .NET SDK, and it costs nothing to throw a real file at it.

What it is not is the SDK itself. This site is our page, with no API and no integration points. Testing here tells you how documents come out; everything else — permissions, branding, storage, retention — you evaluate against the SDK in your own environment.

Testing business documents in the Doconut viewer

Why Use Doconut.app for Your Business?

Doconut.app provides a hassle-free way for companies to explore and test our .NET Document Viewer Library. Whether you're looking to improve internal workflows, client communication, or team collaboration, Doconut has the tools you need.

Free, with no sign-up: No account, no trial period, no card. Drop a file and look at it.
70+ extensions: PDF, Word, Excel, PowerPoint, Visio, Project, CAD, PSD, email, EPUB, TIFF and the image formats — with the size ceiling set per format, from 5 MB for XML up to 25 MB for PDF and images.
Server-side rendering: The document is drawn on our servers and the browser receives pages, which is the same model the SDK uses on yours.
Nothing retained: Your test file is deleted when the session ends. Note that this is a public site, so use documents you are comfortable uploading — for anything confidential, test against the SDK on your own hardware instead.

Applications of Doconut for Businesses

1. Corporate training systems

A training portal that shows PowerPoint decks and PDFs in the browser, so staff do not need Office installed to read the material. The SDK renders them inside your portal; Doconut.app is where you check that your decks come out right.

2. Document portals

A centralised platform where employees or clients read shared files inside your application, behind your login. The sharing, the permissions and the access rules are your portal's — the SDK supplies the rendering.

3. Financial and legal operations

Precision matters here, and so do two caveats worth knowing before you demo it:

Contracts and agreements render with the fonts and layout the sender exported.
Spreadsheets render the values Excel stored at its last save. A viewer does not recalculate, so a workbook left on manual calculation shows figures that may be out of date. On the free site, Excel files stop at 20 MB.

4. Marketing and sales teams

Pitch decks render as one still image per slide, which is worth knowing before it surprises someone: a slide built to reveal four bullets on four clicks shows all four at once. That is the format, not a fault. Doconut.app has no sharing feature — each person opens their own copy.

Key Features of Doconut.app

Accurate rendering: Fonts, formatting and layout as the author saved them, drawn from the file rather than from an embedded preview.
Nothing to install: Test straight from the browser.
70+ extensions on the free site, 75 in the SDK — the two extra being .dcm and .ima, the DICOM plugin the free viewers deliberately leave out.
Customisable in the SDK, not here: Branding, toolbars and permissions belong to the licensed component running inside your application. Doconut.app looks like our site because it is our site.

Get Started with Doconut.app

Test the rendering first, since it is free and takes a minute: open Doconut.app and upload the ugliest document you have — the issued drawing, the 200-page scan, the deck with the corporate font. Sample files always pass; yours are the ones that matter.

When the rendering holds up, the trial licence and the documentation are on the Doconut.com download page.