Managing documents in a busy office comes down to one recurring problem: a file arrives in a format the machine in front of you cannot open. OnlineDocumentViewer.com solves that problem and no other. Here is what it covers, so you know when to reach for it and when you need something larger.
What it does
One upload box, 70+ extensions
PDF, Word, Excel, PowerPoint, Visio, Project, CAD (DWG, DXF, DGN), PSD, TIFF, EML and MSG email, EPUB, HTML, XML, text and the image formats. Drag the file in and it renders. Nothing installs, and there is no account to create.
A ceiling per format, not one for the site
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 plain text. Over the ceiling the upload is refused and the message names the number.
Conversion, when reading is not the end of it
PDF to Word, Excel, PowerPoint, PNG or JPG. Word and Excel to PDF or image. Images to PDF, WebP or TIFF. One file per conversion, on the converter pages.
Any device with a browser
Rendering happens on the server, so a phone or a five-year-old laptop opens a heavy file about as well as a workstation does.
What it does not do
This is the half most tools leave out.
- No storage. The file sits in a temporary session and is deleted after viewing. No library, no history, no second copy.
- No accounts. Nothing to register, so no permissions, no sharing, no audit trail, and nothing to sign into from a second device.
- No collaboration. No comments, no simultaneous editing, no annotation layer.
- No editing. It renders documents; it does not change them.
- No batch. One file at a time. No folder upload, no ZIP, no queue.
- No per-file support. The free tool has none. SDK customers reach the Doconut team directly.
If your workflow needs versions, permissions and an audit trail, what you need is a document management system, and this is not one. It is the viewer you point at the attachment that will not open.
FAQs
Are my documents stored?
No. Transfers run over HTTPS, the file is rendered on the server, and the upload is deleted after viewing. Server-side rendering does mean the server reads the file while it draws it — for documents that may not leave your own network, run the Doconut .NET SDK inside your own infrastructure instead.
Can I reach my files from another device?
There are no files to reach. Nothing is kept, so each device uploads the copy it already has.
Which file types are supported?
The 70+ extensions listed above, across seventeen viewers. DICOM (.dcm and .ima) is the deliberate exception: it belongs to a separately licensed plugin for the SDK.
Is there a certification behind it?
No. No ISO 27001, no SOC 2, no HIPAA attestation. If an auditor needs a certificate, this tool cannot produce one.
Conclusion
A viewer that opens the file and then forgets it. Everything above that line — retention, permissions, collaboration, an audit trail — is a different class of software, and this site is not pretending to be it.