⬡ Universal File Viewer

A powerful, browser-based file inspection tool that runs entirely client-side. Open, inspect, and analyze 500+ file formats with zero uploads and zero servers.

🔗 Live Demo:
https://boothy91.github.io/FileViewer/

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Overview

Universal File Viewer is a single-page web application designed for developers, designers, analysts, and power users. All processing happens locally using browser APIs. Files never leave your device.

Supported Categories

Images · Video · Audio · Code · PDF · CSV/XLSX · GPX/KML · GLB/STL · ZIP · Fonts · MIDI · Certificates · Binary

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Core Features

📂 Drag & Drop Interface

• Tap or drag files directly into the viewer
• Fullscreen mode
• Dark / Light theme toggle
• Recent file history (stored locally)
• Mobile-optimized UI

🧠 Smart File Detection

• Extension-based routing
• Magic byte signature detection
• Automatic viewer selection

👁 Built-in Viewers

• Images: PNG, JPG, WebP, AVIF, SVG, ICO, RAW + EXIF & color palette extraction
• Video: MP4, MKV, MOV, AVI with thumbnail strip
• Audio: MP3, WAV, FLAC + waveform + MIDI piano roll
• Documents: TXT, Markdown, PDF, DOCX
• Data: CSV, XLSX (multi-sheet), JSON (formatted)
• Code: Syntax highlighting + line numbers
• Archives: ZIP browser with file extraction
• 3D Models: GLB, GLTF, STL, OBJ (interactive viewer)
• Geospatial: GPX, KML map rendering
• Fonts: TTF, OTF, WOFF live preview
• Binary: Hex viewer with ASCII column

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Built-in Tools

• Converter – Base64, text transformations, 30+ conversions
• Diff Viewer – Side-by-side comparison
• Hash Checker – MD5, SHA1, SHA256
• QR Generator – Encode text to QR
• Text Tools – Sort, dedupe, word count
• Image Editor – Resize, crop, filters

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Architecture

This project is a single index.html file. No build system. No backend. No dependencies to install.

Core Technologies

• Vanilla JavaScript
• FileReader API
• Canvas API
• WebAudio API
• LocalStorage

External Libraries (CDN)

• Three.js – 3D rendering
• Leaflet – Map rendering
• SheetJS – XLSX parsing
• Mammoth.js – DOCX rendering
• JSZip – ZIP browsing
• QRCode.js – QR generation

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Privacy & Security

• 100% client-side
• No uploads
• No analytics
• No tracking
• No server processing

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Local Development

git clone https://github.com/py0sc/FileViewer.git
cd FileViewer
open index.html

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License

MIT License

If this project is useful, consider starring the repository ⭐