File to Base64

A fast, private, client-side developer tool for converting files and text to Base64, decoding Base64 as UTF-8 text, creating Data URIs, and downloading results. No backend, uploads, analytics, or external conversion services are used.

Features

• File → Base64 and Text → Base64
• Base64 → Text with UTF-8 support
• Drag & Drop and file picker
• Clipboard copy and Blob downloads
• Data URI generation
• File information and Base64 statistics
• Dark/Light theme with LocalStorage and system preference
• PWA manifest
• Offline/client-side processing
• Responsive UI for desktop and mobile

Tech Stack

HTML5, CSS3, JavaScript ES Modules, Web APIs, File API, Clipboard API, Blob API, LocalStorage, and PWA.

Privacy

Files are processed locally in your browser and never leave your device. No file content is sent over the network.

Project Structure

File-to-Base64/
├── index.html
├── main.js
├── manifest.json
├── README.md
├── LICENSE
└── src/
    ├── css/
    │   ├── styles.css
    │   ├── fonts.css
    │   └── originalText-andBase64-Fonts.css
    ├── js/
    │   ├── script.js
    │   ├── base64.js
    │   └── base64words.json
    ├── favicon-512.svg
    └── favicon-128.svg

public/ mirrors the static files so the included Next.js preview can serve the no-build browser app at /index.html.

How to run

Serve the project with any static HTTP server and open its URL. For example, use the static server built into your editor or a local HTTP server. ES Modules and PWA features may require http:// or https:// rather than file://.

License

WTFPL 2.0. See LICENSE.