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Convert and clean up audio in your browser
Audio editing used to mean desktop software, large downloads and sending files to conversion services. Every task described here now runs entirely in your browser using FFmpeg compiled to WebAssembly. Your files never leave your device, the tools work offline after the first load, and there is no account to create.
Cutting and trimming: the audio cutter
The audio cutter lets you select a section of a track, keep it or remove it, and add fade-in and fade-out. Drop a file, drag the handles on the waveform to the segment you want, and click cut. A ringtone preset applies a 30-second window with automatic fades in one click. Use it to trim silences from a voice recording, cut the intro off a podcast episode, or clip the chorus of a song for a ringtone. The output format matches the input by default; you can also convert in the same step.
Merging and mixing: the audio merger
The audio merger joins multiple tracks into a single file. You can stack them end to end with an optional crossfade between clips, or mix them on top of each other (for example, adding a background music track under a voice recording). Add a fade-in at the start and a fade-out at the end of the combined result. All the source files are processed in one browser session; the combined output is a single download.
Converting between formats and extracting from video
The audio converter handles format changes between MP3, WAV, AAC and OGG at any bitrate. If the source audio is inside a video file (an MP4 lecture, a MOV recording, a WebM clip), use the audio extractor to pull the track out and choose the output format in one step. Both tools are backed by the same FFmpeg engine. The audio tags editor lets you set the ID3 metadata on MP3 files (title, artist, album, track number, cover art) without re-encoding, so the file size stays the same.
Privacy: what actually happens to your file
Every audio tool on this site runs in a Web Worker inside your browser tab. When you drop a file, it is read into browser memory. The FFmpeg WebAssembly engine processes it there and the output is written back to memory, then offered as a download. No byte of your audio file is transmitted to any server at any point. The only network activity is the one-time download of the FFmpeg engine itself (about 30 MB, cached locally). You can verify this by opening your browser Network tab during any job: no outgoing request will carry your file data.
Tools in this article
- Audio cutter Cut a clip out of an MP3, WAV or M4A right in your browser: fade in/out, ringtone preset. No upload.
- Merge audio files Concatenate multiple audio files (MP3, WAV, M4A, OGG…) into one. Drag to reorder. No upload.
- Audio converter Convert audio to MP3, WAV or AAC directly in your browser. No upload.
- MP3 tag editor (ID3) Edit MP3 ID3 tags (title, artist, album, cover…) in your browser. No upload.
- Extract audio from MP4 Extract the audio track from your MP4 videos as MP3, without server-side conversion.
Frequently asked questions
Do all these tools work offline?
Yes, after the first use. The FFmpeg WebAssembly engine downloads once and the browser caches it. After that, the cutter, converter, merger, extractor and tags editor all work without any internet connection. The vocal remover uses the same engine and also works offline after the first load.
Which audio formats are supported?
The converter, cutter and merger accept MP3, WAV, AAC (M4A), OGG and M4A as input. The audio extractor additionally accepts video containers (MP4, MOV, MKV, WebM, AVI). Output choices include MP3, WAV, AAC and OGG across all tools. The tags editor works on MP3 files only, since ID3 tags are an MP3-specific standard.