Stop Uploading Files: I Built a Privacy-First Converter with WebAssembly 🛡️

Source: Dev.to

Introduction

As developers, we often need quick tools to convert a video, remove a background from an image, or clean up audio noise. The problem? Most online tools force you to upload your files to a remote server.

This introduces two major issues:

• Privacy Risks: You are handing over sensitive data to unknown servers.
• Latency: Uploading a 500 MB video just to convert it takes forever.

I wanted to solve this by leveraging the power of modern browsers, so I built ConvertSafely.

Architecture: True Client‑Side Processing

ConvertSafely processes everything locally on your device. By utilizing WebAssembly (Wasm) and client‑side AI models, the heavy lifting happens right in your browser. Your files never leave your computer.

Benefits

• Zero Latency: No upload/download waiting times.
• 100 % Privacy: No backend storage of your files, making data breaches architecturally impossible.
• Serverless Scalability: Processing power comes from the user’s device, not expensive cloud GPUs.

AI Features

Beyond standard file conversion, I integrated client‑side AI tools:

1. AI Noise Remover 🎙️

Cleaning up audio usually requires heavy desktop software. ConvertSafely uses browser‑based processing to isolate voice frequencies and remove background static or noise instantly, without sending the audio file to the cloud.

2. Background Remover 🖼️

Machine‑learning models run directly in the browser, allowing you to strip backgrounds from images in seconds. Ideal for e‑commerce or profile pictures, and completely private.

Full Feature Set

• Media Conversion: Video, audio, and image formats (WebP, MP4, MP3, PNG, etc.).
• Document Tools: PDF and text conversions.
• AI Tools: Background removal & noise reduction.
• Security: No registration, no uploads, no logs.

Roadmap & Feedback

I am currently optimizing the Wasm implementation for larger files and improving the accuracy of the AI models. I built this to be the “Swiss Army Knife” I always wanted: clean, fast, and respectful of user data.

I’d love to hear your feedback on performance, especially on the new AI features!

Try It

👉 Try it here: https://www.convertsafely.com/en