Convert Video & Audio Files Free & Private
Convert files instantly — right in your browser. Your files never leave your device.
Fast, free, and completely secure.
Convert to MP4
The most popular video format — works everywhere
Other Popular Conversions
Audio extraction, format changes, and more
100% Private
Files never leave your device. Zero server uploads.
Near-Native Speed
Powered by WebAssembly for blazing fast conversion.
Always Free
No limits, no sign-up, no hidden costs. Ever.
Eco-Friendly
Zero cloud processing. ~90% less carbon than server-based tools.
How It Works
Convert files in three simple steps
Choose Your File
Drag and drop or click to select the file you want to convert. Supports files up to 500MB.
Select Output Format
Choose your desired output format and adjust quality settings if needed.
Download Result
Your file is converted instantly in your browser. Click download when it's ready.
Free Online File Converter — Private & Secure
ConvertFree is a privacy-first online file converter that processes all your files directly in your web browser using WebAssembly technology. Unlike traditional converter websites that upload your files to remote servers, our tool never sends your data anywhere — everything happens locally on your device.
This makes ConvertFree ideal for professionals in legal, healthcare, and finance who handle sensitive documents and cannot risk uploading confidential files to third-party servers. Whether you need to convert an MP4 video to MP3 audio, compress a large video file, or trim a clip, you can do it all without any privacy concerns.
Our converter supports popular video formats including MP4, MOV, AVI, MKV, and WebM, as well as audio formats like MP3, WAV, AAC, FLAC, and OGG. With near-native processing speeds powered by FFmpeg compiled to WebAssembly, you get fast, high-quality conversions without installing any software.