Preview PDFs and Office Files on Any Device — No Software Needed

Imagine opening a PDF, Word, Excel, or PowerPoint directly in your browser — no downloads, no desktop tools, and no waiting for software updates.

That’s exactly what OnlineDocumentViewer delivers.

Whether you're on desktop, tablet, or mobile, you can upload a file and view it instantly with a clean, fast, browser-based interface.

🚀 Zero-Install, Zero-Hassle

Traditional document handling requires:

Downloading files
Installing PDF readers or Office tools
Managing updates and licenses

With OnlineDocumentViewer, you skip all of that:

✔ Opens instantly in the browser ✔ Nothing to install ✔ No plugins required ✔ No compatibility issues

Just upload and preview.

📄 Multiple Formats, One Site

Seventeen viewers, 70+ extensions between them:

PDF — 25 MB
DOC, DOCX, ODT, RTF — 15 MB
XLS, XLSX, CSV, ODS — 20 MB
PPT, PPTX, ODP — 20 MB
Images (JPG, PNG, GIF, BMP, WEBP, TIFF, SVG, EPS) — 25 MB
Emails (EML, MSG, EMLX) — 10 MB
CAD drawings (DWG, DXF, DGN) — 10 MB
PSD, Visio, Project, EPUB

The ceiling is set per format rather than once for the whole site, because a drawing and a text file do not cost the same to render. It is a fixed catalogue: the upload box refuses what is not on it instead of failing later.

🛡 Secure File Handling

Files are rendered server-side, so your device doesn’t execute any risky content. This keeps users safe from:

Macro-based malware
Email attachment threats
Vulnerable plugins
Local file execution

Your document is visualized safely — as an image-based stream.

The upload is deleted from the server when the session ends. There is no account, no library and no second copy, so there is nothing kept to encrypt or to have a retention policy about.

💼 Perfect for Business and Remote Teams

Online Document Viewer is ideal for:

Customer support reviewing attachments
Legal or financial teams previewing contracts
Remote workers needing quick access
Users without Microsoft Office installed
BYOD environments

No setup. No training. Universal access.

⚙️ Powered by Doconut .NET 6

Behind the scenes, Online Document Viewer runs on the Doconut .NET 6 rendering engine — the same technology powering enterprise-grade document platforms.

This means:

Fast page rendering
High visual fidelity
Scalable server performance
Continuous updates
Enterprise reliability

What developers get in Doconut — end-users get online.

📱 Anywhere, Anytime

Windows, macOS, Linux, iOS, Android — the viewer is a web page, so the operating system stops mattering. If you have a current browser, you are good to go.

👉 Try It Now

Upload a document and preview it instantly:

https://onlinedocumentviewer.com

No registration. No software. No headaches.

Just fast, secure, online document viewing.