FileBrowser includes powerful built-in viewers for a wide range of file types, letting you preview and edit content without downloading files to your device.

Quick Preview

Click any file to open it in the appropriate viewer. FileBrowser automatically detects the file type and opens it with the best viewer available.

Supported File Types

Text Files & Code

The Text Editor provides syntax highlighting and editing capabilities for code and text files:

File compatibility:

  • Any UTF-8 compatible text file under 25MB can be viewed and edited
  • Automatic syntax highlighting for hundreds of programming languages
  • Supports all common text-based formats: source code, config files, scripts, logs, markdown, and more

Features:

  • Syntax highlighting for hundreds of programming languages
  • Line numbers for easy navigation
  • Code editing with save functionality
  • Dark and light themes that match your system preference
  • Search and replace within the editor
  • Keyboard shortcuts for common operations

Images

The Image Viewer displays photos and graphics with smooth navigation:

Supported formats:

  • whatever your browser’s supported formats are
  • .heic, .heif - viewable natively on Safari; other browsers require media integration
  • Raw formats: .raw, .cr2, .nef, .arw, .dng, .orf, and others (requires v1.3.0+)

Features:

  • Full-screen viewing with zoom controls
  • Navigate between images using keyboard arrows or on-screen buttons
  • Automatic slideshow through image galleries
  • SVG support for vector graphics
  • EXIF data display for photos (when available)

Videos

The Media Player provides a full-featured video watching experience:

Supported formats: Whatever your browser supports! see compatibilty matrix.

Features:

  • Subtitle support - using subtitle sidecar files or embedded subtitles (when enabled).
  • Picture-in-picture mode (on supported browsers)
  • Keyboard shortcuts for quick control

Audio

The Audio Player offers a beautiful listening experience with album art and metadata:

Supported formats:

  • Common: .mp3, .m4a, .ogg, .wav, .flac
  • Advanced: .opus, .aac, .wma

Features:

  • Album artwork display - automatically extracted from audio metadata
  • Metadata display - shows title, artist, album, and year
  • Playlist navigation - move between tracks in a folder
  • Playback controls - play, pause, skip, volume
  • Continuous playback through multiple tracks

PDF Documents

PDFs open in an embedded viewer right in your browser using your browser’s native PDF viewer. All features are browser dependant.

Markdown & HTML

The Markdown/HTML Viewer renders formatted documents:

Supported formats:

  • Markdown: .md, .markdown
  • HTML: .html, .htm

Features:

  • Rendered preview showing formatted content
  • Table of contents generation (for markdown)
  • Syntax highlighting for code blocks
  • Link navigation (internal and external)
  • Responsive layout adapts to screen size

EPUB & eBooks

The EPUB Viewer provides a comfortable reading experience:

Supported formats:

  • .epub - electronic book format
  • .mobi - Kindle format (basic support)

Features:

  • Chapter navigation with table of contents
  • Adjustable text size for comfortable reading
  • Bookmarking to save your reading position
  • Page turning with keyboard or touch gestures
  • Responsive layout optimized for different screen sizes

Office Documents (Basic)

The Document Viewer provides basic preview for Microsoft Office files:

Supported formats:

  • Word: .docx
  • PowerPoint: .pptx (limited)
  • Excel: .xlsx (limited)

3D Models

The 3D Model Viewer lets you inspect and rotate 3D objects:

Supported formats:

  • .obj - Wavefront object (with optional .mtl materials)
  • .stl - Stereolithography (commonly used for 3D printing)
  • .gltf, .glb - GL Transmission Format
  • .dae - Collada format
  • .ply - Polygon file format
  • .3mf - 3D Manufacturing Format
  • .3ds - 3D Studio Max
  • .usdz, .usd - Universal Scene Description (Apple AR format)
  • .amf - Additive Manufacturing Format
  • .wrl, .vrml - Virtual Reality Modeling Language
  • .vtk - Visualization Toolkit format
  • .pcd - Point Cloud Data
  • .xyz - XYZ point cloud format
  • .vox - MagicaVoxel format
  • .kmz - Keyhole Markup Language (Google Earth 3D)

Features:

  • 360° rotation - click and drag to rotate the model
  • Zoom controls - mouse wheel or pinch to zoom
  • Auto-rotation spacebar to start/stop auto-rotate
  • Reset view to return to original orientation

Advanced Office Integration

For full-featured document editing, FileBrowser integrates with OnlyOffice Document Server:

OnlyOffice Features

When OnlyOffice is enabled, you get:

  • ✅ Full document editing - edit Word, Excel, and PowerPoint files
  • ✅ Real-time collaboration - multiple users can edit simultaneously
  • ✅ Rich formatting - all formatting options preserved
  • ✅ Comments and track changes
  • ✅ Create new documents from templates
  • ✅ Share with editing permissions

Files Without Preview

Some file types don’t have built-in preview support.

If the user can download, they will see a simple viewer like this:

Editing Files

Many viewers support editing:

  • Text Editor - Edit any text-based file and save changes
  • OnlyOffice - Full document editing (when enabled)

Changes are saved back to the file immediately when you press save.