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Drop audio or video files here

Batch convert as many files as you like — nothing ever leaves your device.

Works with whatever your browser can already play — MP3, WAV, OGG, M4A/AAC, most FLAC and WEBM. Some video files decode too, depending on your browser.

Output format

Bitrate 192 kbps

Sample rate

Channels

Applies to every file in the batch. Leave blank to keep full length.

Start (mm:ss)

End (mm:ss)

Fade in (sec)

Fade out (sec)

Reverse audio

Volume gain 0 dB

Normalize loudness

Evens out quiet/loud sections to a broadcast-standard loudness (EBU R128).

Playback speed 1.00×

Changing speed also shifts pitch slightly, like a tape deck — true independent pitch-shifting isn't available client-side yet.

Write these tags to output

Artist

Album

Genre

Year

Comment

Tags are written directly into the WAV file's own INFO chunk (no library needed) — only for WAV output. Titles are kept as each file's original name. Tags apply to every file in the batch.

Queue

No files yet — add some above to get started.

What actually runs where

No external engine, no API, no CDN — this page is 100% self-contained code. Decoding uses your browser's own built-in Web Audio API; trimming, fades, volume, normalize, speed and reverse are computed with hand-written code on top of it; and WAV, AIFF and ZIP files are assembled byte-by-byte by our own encoder, right here in this file. Nothing is ever uploaded, and nothing is ever fetched from the internet after this page loads.

Output formatsWAV and AIFF are written by our own lossless encoder — always available, instant. "Compressed" uses your browser's own built-in encoder (Opus/WebM or AAC/MP4, whichever your browser supports) — real MP3/FLAC encoding needs a bundled third-party library, which we deliberately left out.

Input formatsWhatever your browser can already play: MP3, WAV, OGG, M4A/AAC, and usually FLAC and WEBM. Older/exotic formats (WMA, AMR, AC3, ALAC, APE) depend on your specific browser and aren't guaranteed without an external library.

Not included (honestly)True MP3/FLAC encoding and "AI" noise removal, speaker ID or language detection all need bundled libraries or large ML models — left out on purpose rather than silently depending on a CDN.

📋 How to Use This Tool

Step 1: Drag in your audio or video files, or click Choose Files — add as many as you like.
Step 2: Pick an output format and adjust quality, trim, fades, volume or tags from the panel on the left.
Step 3: Click Convert All, then download each file or grab everything as one ZIP.

⚡ Key Features & Benefits

Lossless Output: WAV and AIFF, written instantly by our own encoder — plus a compressed Opus/AAC option using your browser's built-in encoder.
Batch Processing: Convert dozens of files in one queue, download individually or as one ZIP.
Real Editing: Trim, fade, normalize, volume, speed and reverse — computed directly with the Web Audio API.
No API, No CDN: Every byte is generated by code on this page. Nothing is uploaded, nothing is fetched from the internet.

❓ Frequently Asked Questions

Is my audio uploaded to a server for conversion?

No — every conversion happens directly in your browser using the Web Audio API. Nothing is uploaded or fetched from the internet.

Which formats are supported?

Lossless WAV and AIFF output via our own encoder, plus a compressed Opus/AAC option using your browser's built-in encoder.

Can I edit the audio, not just convert it?

Yes — trim, fade, normalize, adjust volume, change speed, and reverse audio are all computed directly in-browser.

🔗 Quick Links

📚 View Documentation 📝 Read Blog Guide ✉️ Request a Custom Tool

Audio Converter