Introducing OnlineBox — Free Browser-Based Tools That Respect Your Privacy

What is OnlineBox?

OnlineBox is a growing collection of free browser-based tools built for developers, designers, and everyday users. Every tool runs locally in your browser — nothing is uploaded to a server, nothing is tracked, your files never leave your device.

Current Tools

Image Tools

• Image Compressor — Compress images to an exact KB target without losing more quality than necessary.
• Image Converter — Convert images between PNG, JPG, WebP and other formats instantly.
• Image Resizer — Resize images to exact dimensions while preserving aspect ratio.
• Batch Image Compressor — Compress multiple images at once.

Developer Tools

• CSV to JSON — Paste CSV data and convert it to clean JSON instantly.
• JSON Formatter — Format, validate and minify JSON in one click.
• M3U8 Player — Play any HLS stream directly in your browser with speed control and fullscreen support.

Creator Tools

• QR Code Generator — Generate QR codes for any URL or text, download as PNG.
• Social Card Maker — Create clean social media preview cards for Twitter, LinkedIn and more.
• Markdown to PDF — Convert Markdown documents to clean, printable PDFs.
• Gradient Generator — Create beautiful CSS gradients and copy the code instantly.

Why browser-based?

Most online tools send your files to a server for processing. That means your data — images, documents, spreadsheets — passes through someone else's infrastructure.

OnlineBox takes a different approach: every tool runs entirely in your browser using JavaScript. The processing happens on your device. We never see your files.

What's coming next

More tools are on the way, including Base64 encoder/decoder, timestamp converter, regex tester, color format converter and more.

Follow along as OnlineBox grows. If you have a tool request or feedback, feel free to reach out.