Convert MP3, WAV, FLAC, OGG, Opus, M4A, and AIFF in your browser. Batch to ZIP, free.
Batch conversion All tools
Audio Editing Tools
Trim, join, convert, retag, or change the pitch and tempo of a file, entirely on your device, with the original never leaving your browser.
Which tool do you need?
| If you want to… | Use | Why |
|---|---|---|
| Convert between MP3, WAV, FLAC, and other formats | Audio Converter | Batch conversion with control over bitrate, sample rate, and channels for any file your browser can decode. |
| Cut a clip to a specific start and end point | Audio Trimmer | Millisecond-precise selection by drag or typed values, with fades and zero-crossing snap. |
| Combine several clips into one file | Audio Joiner | Reorder up to 50 clips with crossfades or gaps, and optional loudness matching between them. |
| Pull the audio track out of a video file | Video to Audio | Stream-copy or convert the audio from a local video, with language-track selection. |
| Transpose a whole track to a new key | Pitch Shifter | Semitone and cent-level pitch shifting that keeps tempo unchanged, with key detection. |
| Slow down or speed up a track for practice at an exact BPM | Music Speed Changer | BPM-targeted time-stretching with pitch preserved, plus a loopable practice region. |
| Play a clip backwards or build a swelling reverse-reverb lead-in | Reverse Audio | Sample-accurate reversal of a whole file or a selected region, plus a dedicated reverse-reverb mode. |
| Add or replace cover art on a FLAC file | FLAC Cover Art | Native PICTURE-block editing with no re-encoding, so the audio stays byte-for-byte identical. |
| Edit title, artist, album, and other tags across formats | Metadata Editor | Cross-format tag editing that reads existing metadata and writes it back without re-encoding the audio. |
Edit & convert tools 9
Merge up to 50 clips with crossfade, gain, and loudness matching. Exports one file.
Arrange & crossfadeCut, trim, or remove any section of an audio file with millisecond precision.
Precise selectionAdd, replace, or remove FLAC album art. Audio frames stay byte-for-byte identical.
Lossless tag editEdit tags and cover art for MP3, FLAC, M4A, OGG, WAV. Audio stays untouched.
Tags & artworkChange the pitch of a whole track by semitones and cents without touching the tempo.
±12 semitonesChange playback speed from 25-300%, keep pitch fixed, and set an exact target BPM.
25–300% speedExtract audio from MP4, MOV, MKV, WebM, or AVI files. Original stream or MP3, WAV, FLAC.
Track extractionTrim, join, or convert — picking the right starting point
Most editing tasks start with one of three tools. If you have one file and need a smaller piece of it, the audio trimmer cuts by dragging on the waveform or typing exact start and end times, with fades and a keep-or-remove mode for cutting out a middle section. If you have several files, or several clips, that need to become one, the audio joiner reorders and stitches up to 50 clips with crossfades or gaps between them. If the problem is the file's format rather than its length, the audio converter changes between MP3, WAV, FLAC, OGG, Opus, M4A, AAC, and AIFF, with batch conversion for multiple files at once.
Video is a special case: if what you actually want is the audio out of a video file, video to audio extracts it directly, either as an unmodified stream copy or converted to a standard audio format, and it can pick a specific audio track when a video has more than one language. It is built for local video files you already have, not for downloading audio from a URL or a streaming site.
Pitch and tempo: whole-track changes vs. music practice
Pitch shifter and tempo changer both use time-stretching, but they change different things. Pitch shifter transposes an entire track up or down in semitones and cents while keeping the tempo the same, which is what you want when a song needs to move to a different key, and it shows the detected original key alongside the new one. Tempo changer instead keeps the pitch fixed by default and changes playback speed, with a BPM mode that sets an exact target tempo for practicing a piece slower or faster, plus a loop feature for repeating a section while you work on it.
Reverse audio is a different kind of change entirely: it plays the whole file or a selected region backwards, sample-accurately, without touching pitch or tempo at all. It also has a reverse-reverb mode, which reverses a clip, adds reverb, then reverses the result again, producing a swelling pre-echo effect that leads into a sound rather than trailing off after it — a technique that only makes sense as its own tool, not as an option on the pitch or tempo tools.
Tags and artwork: FLAC vs. everything else
Flac cover art and audio metadata editor can look like they do the same job, but they're built around a real technical difference. FLAC stores its artwork and tags in its own PICTURE blocks and Vorbis comments, and the FLAC-specific tool reads and writes those directly in JavaScript, so the audio frames stay byte-for-byte identical with no re-encoding at all. It also lets you preview existing artwork, pick a picture type such as front or back cover, and extract artwork that's already embedded.
Audio metadata editor works across formats — MP3 via ID3v2, FLAC via Vorbis comments, and others through format probing — for the everyday fields like title, artist, album, year, track number, and genre, plus adding cover art. FLAC is written natively there too, while MP3, M4A, OGG, and WAV go through a stream-copy path that edits the tags without re-encoding the audio. If FLAC artwork is the whole task, the dedicated tool has more artwork-specific detail; for tagging across a mixed library, the metadata editor is the one built for that.
Frequently asked questions
What's the real difference between pitch shifter and tempo changer?
Pitch shifter changes a track's key while keeping the tempo the same. Tempo changer changes the speed, by default keeping pitch the same, and adds a BPM mode for hitting an exact target tempo, which is what practicing a piece at a slower speed usually needs.
When should I use flac cover art instead of the metadata editor?
Use flac cover art when the file is specifically FLAC and artwork is the main task — it edits PICTURE blocks natively with no re-encoding. Use the audio metadata editor for everyday tags across multiple formats, or when you're tagging a mixed library, not just FLAC files.
Does converting a file re-encode it losslessly?
Converting to a lossy format like MP3 or AAC always involves lossy encoding, even from a lossless source. Some format changes and tag edits, like the FLAC and metadata tools' stream-copy paths, avoid re-encoding the audio at all, which the relevant tool page explains.
Can I convert multiple files at once?
Yes. The audio converter supports adding many files, converting them all with the same settings, and downloading the results as a single ZIP.
Are these editing tools free, and are my files uploaded anywhere?
Yes, every tool here is free with no sign-up. Files are decoded and processed in your browser; nothing is uploaded to a server.
Is there a limit on file size or clip count?
Files are limited to 150 MB, and your device's own memory can be a tighter limit on longer or higher-resolution audio. The audio joiner allows up to 50 clips in a single project.