FileNaut
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EPUB Viewer & Reader — View EPUB Files Online Free

Open and view EPUB files right in your browser — no upload, no signup. Your files never leave your device.

Open in new tabEPUB 2 & 3 supported

Tap Fullscreen for a distraction-free, full-screen reading experience, or Open in new tab to read the EPUB on its own page. Everything runs locally in your browser — non-DRM EPUB files only.

A Free EPUB Viewer and Reader in Your Browser

FileNaut's EPUB viewer lets you open and view .epub files instantly — no app to install, no account to create, and nothing uploaded to a server. Drop in an EPUB file and this EPUB viewer opens it in a clean, distraction-free reading view with a full table of contents, adjustable text size, and multiple reading themes. Because the EPUB viewer runs entirely in your browser, your files stay completely private on your device.

EPUB is the most widely used open ebook format, supported by virtually every ebook store and publisher outside of Amazon's Kindle ecosystem. Whether you need to open an EPUB file you bought from a non-Kindle store, view a free EPUB classic from Project Gutenberg, check an EPUB review copy, or preview an EPUB you exported yourself, this online EPUB viewer displays it in seconds — on Windows, Mac, Android, or iPhone.

Features

  • No upload, fully private — your EPUB is read locally in the browser and never sent anywhere.
  • Table of contents navigation — jump to any chapter, with a searchable contents list.
  • Adjustable fonts — increase or decrease text size for comfortable reading.
  • Reading themes — Paper, White, Sepia, and Dark to suit any lighting.
  • Mobile fullscreen — tap fullscreen for an immersive, edge-to-edge reading experience on your phone.
  • Print a chapter — send the current chapter to your printer or save it as a PDF.
  • Works offline — once the page has loaded, the reader keeps working without a connection.

How to View an EPUB File Online

  1. Click Open EPUB (or drag your .epub file onto the reader).
  2. The book opens to the first chapter, with the full table of contents in the sidebar.
  3. Use Previous / Next or the contents list to move between chapters.
  4. Adjust the font size and theme to your liking — your preferences are remembered.
  5. On mobile, tap Fullscreen for a clean, full-screen read.

Is It Safe and Private?

Yes. Unlike many online readers that upload your file to a server, FileNaut processes the EPUB entirely inside your browser using your device's own resources. The file never leaves your computer or phone, which makes it the right choice for personal documents, unpublished manuscripts, and review copies you don't want sitting on someone else's server.

Frequently Asked Questions

What is an EPUB file?▼
EPUB (Electronic Publication) is the standard open format for ebooks. It is supported by almost every ebook retailer and reading app except Amazon Kindle, and is used by publishers, libraries, and free book archives like Project Gutenberg.
Do I need to install an app to read EPUB files?▼
No. FileNaut's EPUB Reader runs entirely in your web browser — there is nothing to download or install. Just open the page and load your .epub file.
Is my ebook uploaded to a server?▼
No. The EPUB is opened and read locally in your browser. Your file never leaves your device, so it stays completely private.
Can I read EPUB files on my phone?▼
Yes. The reader is fully mobile-responsive, and you can tap Fullscreen for an immersive, edge-to-edge reading experience on iPhone or Android.
Can it open DRM-protected ebooks?▼
No. This reader supports standard, non-DRM EPUB 2 and EPUB 3 files. Books locked with DRM (such as some store purchases) cannot be opened by any general-purpose reader without removing the DRM, which we do not do.
Can I change the font size and background?▼
Yes. You can increase or decrease the text size and switch between Paper, White, Sepia, and Dark themes. Your settings are saved for next time.
What is the difference between an EPUB reader and an EPUB viewer?▼
They are the same thing — both terms describe a tool that opens and displays .epub files so you can read them. FileNaut works as both: it views the contents of any non-DRM EPUB and gives you full reading controls like chapter navigation, font sizing, and themes.

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