Show HN: I built a 100% browser-based image toolkit—no uploads required

Most online image tools ask you to upload your files to a server before converting or compressing them. That always felt unnecessary for common tasks like converting WebP ↔ PNG/JPG, compressing images, or resizing them for social media.

I wanted to see how far I could push browser APIs instead.

The result is a small image toolkit where all processing happens locally in the browser. Your images never leave your device.

Some interesting challenges while building it:

• Processing large images without freezing the UI.
• Keeping memory usage under control.
• Supporting multiple output formats.
• Generating platform-specific image sizes from a single source image.
• Making everything work without a backend.

The biggest benefit wasn't just privacy—it was speed. Since there's no upload/download cycle, common operations feel almost instant.

I'm curious what others think:

• Are there browser APIs or techniques I should explore to improve performance?
• What image-related tasks do you still end up using server-side tools for?

If anyone wants to try it or look through the implementation, I'd appreciate any technical feedback:
https://platformfit.techbasics.online/