Open the file, close the tab

OnlineDocumentViewer renders documents in the browser. An AutoCAD drawing, an Excel sheet, a Photoshop file: upload it, read it, close the tab. No install, no account, no fee.

What it does

70+ extensions through one upload box:

The formats — PDF, DOCX, XLSX, PPTX, DWG, DXF, DGN, PSD, MSG, EML, TIFF, VSDX, MPP, EPUB and more.
Zero installation — no plugin, no download, nothing to approve on a locked-down machine.
Rendering fidelity — fonts, layouts and layers as saved. Where a font is missing, a substitute stands in and the layout shifts slightly; the content does not change.
Nothing stored — HTTPS in transit, and the upload deleted after viewing.
A ceiling per format — 25 MB for PDF, PSD, Visio, EPUB, TIFF and images; 20 MB for Excel, PowerPoint and Project; 15 MB for Word and RTF; 10 MB for CAD and email; 5 MB for HTML, XML and text.

And what it does not do: no editing, no annotation, no accounts, no sharing links, no batch upload, and no OCR — search finds text a document already carries, not text inside a scan.

The same engine, inside your own application

Everything above runs on Doconut.com, a .NET document viewer library. That is the product for teams who want this rendering in their own software rather than on a public page.

Developers — a NuGet package for ASP.NET Core and MVC, with Blazor, Angular and SharePoint integrations documented.
Enterprises — self-hosted. It ships to Windows, Linux and Docker with your app.
Compliance — the document never leaves your network, which is the only arrangement that works for regulated material.
Coverage — 75 extensions across 18 families, DICOM included as a licensed plugin. The free viewers here deliberately leave DICOM out.

Visit Doconut.com for licensing, documentation and a free trial.

Or open a file here first: it is the same renderer, and it costs nothing to find out what it does with yours.