Trim and convert — files stay on your device.
Audio editing online has been awkward for a decade. The major sites either limit you to a few minutes per upload, watermark the output, or charge a subscription for what is fundamentally a few minutes of FFmpeg work. We use the same FFmpeg — but compiled to WebAssembly so it runs in your browser. Drop in a 30-minute MP3, an hour-long voice memo, an entire podcast episode in WAV. Nothing uploads. The conversion happens in a Web Worker so your browser stays responsive, and stream-copy mode (no re-encoding) makes most operations near-instant. For audio that contains private content — voice notes, interview recordings, dictation, music demos — local processing is the only sensible option.
7 audio tools.
Audio Converter
Convert audio between MP3, WAV, AAC, OGG, and FLAC.
Open toolAudio Speed Changer
Speed up or slow down an audio file, right in your browser.
Open toolAudio Trimmer
Trim a section out of an audio file — fast, in your browser.
Open toolMerge Audio Files
Join multiple audio files into one track, with an optional crossfade between them.
Open toolRecord Your Voice
Capture audio from your microphone and download it — no app, no upload.
Open toolRemove Vocals
Cancel the centered vocal in a stereo track to make a quick karaoke or instrumental version.
Open toolVolume Booster
Raise a quiet recording's volume or normalize it to full scale.
Open toolBuilt for privacy, breadth, and speed.
FFmpeg-WASM, full-featured
The same FFmpeg the entire video industry uses. MP3, M4A, AAC, WAV, OGG, FLAC, OPUS — convert any format to any other with the same fidelity as the desktop binary.
Stream-copy fast path
Trimming an MP3 by 30 seconds usually takes less than half a second because we do a container-level cut without re-encoding. Same audio, different boundaries.
Waveform you can actually use
Audio Trimmer renders a peak-decimated waveform so you can drag the in/out handles to exactly the moment you want. No vague time-input boxes.
Mobile-aware
FFmpeg-WASM is a sizeable download (~25 MB) so the tool only loads it when you press the action button. Soft warning on mobile for files large enough to risk OOM.
People ask these things.
How do I trim an MP3 without uploading it?
Open the Audio Trimmer, drop your MP3, drag the in/out handles on the waveform to where you want the clip, hit Trim. The whole pipeline is FFmpeg-WASM running locally — your file never leaves the tab.
Can I convert M4A to MP3 in my browser?
Yes — the Audio Converter handles M4A, MP3, WAV, AAC, OGG, FLAC, and Opus in any direction. Stream-copy where formats are container-compatible, full re-encode otherwise.
What about long files like podcasts?
A 60-minute podcast trims in seconds (stream-copy) and converts in a few minutes (re-encode). The bottleneck is your device CPU, not network bandwidth — so a fast laptop beats a fast internet connection.
Explore more tools.
See every tool we ship.
188 browser-based tools across PDF, image, audio, developer, business, and security categories. All free for daily use; one-time license for unlimited.