How to trim and convert audio or video for free without software?
AudioTool Pro turns your browser into a professional audio editor. Trim, convert, and extract audio from video files (MP4, MKV, AVI, WEBM) directly on your device — no cloud uploads, no sign-ups, no software to install. Your music, podcasts, and recordings never leave your device.
Three steps to edit your audio
- Drag your audio or video file to the upload area. Supports MP3, WAV, OGG, FLAC, MP4, MKV, AVI, and WEBM.
- Use the start and end sliders to trim with precision. The waveform visualization helps you identify silences and key sections.
- Choose the output format (MP3, WAV, OGG, or AAC) and click «Process». Processing happens locally on your CPU.
Supported audio and video formats
Accepts the most popular audio inputs (WAV, MP3, OGG, FLAC) as well as video containers (MP4, MKV, AVI, WEBM). The FFmpeg.wasm engine automatically extracts the audio channel from video without quality loss.
Total privacy: 100% client-side technology
Unlike other online converters, AudioTool Pro uses WebAssembly to run FFmpeg directly in your browser. No files are uploaded to external servers. Ideal for sensitive recordings, unreleased music demos, or private content you need to protect.
Batch conversion
You can load multiple audio files simultaneously. Set a global output format, adjust individual cut points for each track, and download them all with a single click. Perfect for preparing ringtones, sound effects, or podcast episode batches.
Frequently asked questions
What is the file size limit?
There is no limit on our end. The only restriction is the available RAM on your device, as everything is processed locally in your browser.
Does it work on mobile?
Yes. AudioTool Pro is fully responsive and works on any modern Android or iOS browser. The trimming controls are optimized for touchscreens.
Is it really free?
Absolutely. The service is free and requires no registration. It runs on WebAssembly technology that generates no server costs because all processing happens on your device.