How to Use
- Drag and drop your audio or video files into the upload area or click "Select Files". You can add multiple files for batch processing.
- Choose your desired Target Format (e.g., MP3, WAV, OGG, AAC) from the dropdown menu.
- Click "Convert" to load the local high-speed processing engine.
- Once processing is complete, click "Download" next to each track to save it locally.
Core Features
- Absolute Privacy (Zero Uploads): Unlike traditional online audio converters, your personal voice memos or unreleased podcast recordings never leave your device. All decoding and encoding happens securely inside your browser.
- Extract Audio from Video: Beyond converting standard audio formats, you can drop in MP4, MOV, or MKV videos, and the tool will instantly strip and extract the audio track for you.
- Universal Format Support: Easily convert Apple's M4A, lossless FLAC, or legacy WMA into universally compatible MP3s, or high-fidelity WAV files suitable for professional editing.
- Unlimited Batch Processing: Say goodbye to file size and quantity limits. You can drop dozens of audio or video files for high-speed batch conversion.
Related Tools
The 2026 FIRE Calculator (Inflation Adjusted). Simulate real purchasing power, analyze retirement savings gaps, and generate a visual wealth roadmap. One-click CSV export for your Excel or Notion finance dashboard. 100% Private, client-side calculation.
Calculate trade position size from account balance, risk %, entry, and stop loss. Runs locally in your browser with no uploads, so you can compare risk scenarios before you trade.
Calculate compound interest from principal, recurring contributions, APY, and time. Visualize principal, interest, and final balance with a local interactive chart.
Use this Loan Calculator / Mortgage Calculator to estimate monthly payment, total interest, and an amortization schedule locally. Enter amount, rate, and term to calculate now with instant charts.
Use this Investment Calculator / ROI Calculator to estimate starting capital, monthly contributions, annual return, and inflation-adjusted results locally. Calculate projected returns with an instant compound interest chart, ROI, and yearly schedule.
Use this APR to APY Calculator to convert between APR and APY locally. Enter a rate, choose compounding frequency, and see the effective interest rate, spread, and frequency comparison instantly.
Use this Profit Margin Calculator to calculate gross profit, Markup, Margin, and selling price locally. Enter cost and price, or cost and target margin, then calculate your margins instantly.
Use this CPM Calculator and CPC Calculator to estimate ad spend, impressions, clicks, CPM, CPC, and CTR locally. Enter budget and target costs to plan campaign scenarios instantly.
Calculation Logic
Audio formats can be notoriously frustrating: Apple's M4A voice memos struggle on Windows, lossless FLAC files are too massive for quick sharing, and OGG is required for optimal web audio playback.
This tool utilizes cutting-edge WebAssembly and FFmpeg technology, effectively putting a full-featured audio workstation right inside your web browser. When you need to convert a format or extract background music from a video, your browser directly reads the local file and performs high-speed re-encoding. Since there are no servers acting as middlemen, the process is incredibly fast and guarantees 100% privacy.
FAQ
Can I extract audio from an MP4 movie?
Yes, absolutely. Because our core engine understands almost all multimedia formats, you can simply drop a video file into the tool, select MP3 or WAV as the output, and the tool will automatically ignore the video stream and extract only the audio track.
Why is there no upload size limit?
Traditional converter websites pay for expensive cloud computing and bandwidth, so they enforce limits to push you into premium plans. Our tool utilizes your own device's CPU to perform the conversion, costing us nothing in server resources. Therefore, we don't limit you.
Is it really completely private?
Yes. Your voice recordings and audio files are never uploaded. To verify this, load the page, let the engine initialize, and then completely disconnect your computer from the internet. You'll find that the tool continues to perfectly convert your audio offline.
Will converting to MP3 reduce audio quality?
MP3 is a lossy format. However, we use very high-quality encoding parameters (roughly equivalent to 192kbps VBR), making the quality loss virtually indistinguishable on standard headphones and speakers while drastically reducing file size. If you require absolute lossless fidelity for professional mixing or editing, choose the WAV output format instead.