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Reviewing a recording goes faster when you can see it. Quiet stretches, applause, a dropped cue and the start of each answer all show up in the waveform. Click where you want to listen, loop the bit that matters, and work through a stack of takes without uploading any of them.
Processing locally on your device
Overview
When you listen to recordings for work, you rarely play them straight through. A journalist checks a quote, a student goes back over one part of a lecture, and a band compares three takes of the same chorus. The waveform makes that kind of listening quicker, because speech, music and silence look different. Sentences show up as dense clusters with gaps between them, applause as a wide flat band, and a missed entry as a hole. Click any point to start there, so you're not dragging a tiny progress bar.
For transcription, combine the A-B loop with a slower speed. Drag across the sentence you're typing, set the speed to 0.75× or 0.8×, and it repeats until you've written it down. Because the player preserves pitch, voices stay natural instead of dropping to a growl. Then press ← to step back five seconds (Shift+← for one second) to catch a word you missed, without taking your hands off the keyboard.
Musicians use the same loop to practise. Loop a tricky fill or a fast run, slow it to 0.6×, play along until it sits, then speed back up in 0.05 steps. Practice recordings, rehearsal takes, lesson audio and isolated stems all load into the same playlist, and the next track can start automatically. Video files work as well; only the soundtrack plays, which is handy for reviewing a recorded talk or a rehearsal filmed on a phone.
Everything runs on your own computer. The browser decodes each file once to draw its waveform with the Web Audio API, and the original file streams from your disk during playback. Nothing is uploaded, so unreleased songs, confidential interviews and patient or client recordings stay private. The info panel shows each file's format, size, duration, average bitrate and channel layout, which helps you spot a mono phone memo among stereo studio files.
Drop your recordings (audio or video files) onto the page. They form a playlist in the order you add them.
Look at the waveform and click wherever you want to start listening.
Turn on A-B loop and drag across a sentence, phrase or bar to repeat it.
Lower the speed for transcription or practice. The pitch stays the same.
Press N and P to move between takes, and L to toggle the loop.
Use cases
Loop each answer at 0.8× and type along. Jump back a second with Shift+← whenever a name or number goes by too fast, then release the loop and move on to the next question.
Drop all of tonight's rehearsal takes into the playlist, skip through each one on the waveform to the bridge, and loop the part where the timing drifted so everyone can hear it.
Silences and topic changes show up in the waveform, so you can jump straight to the next section, slow down dense explanations and loop a definition until your notes are complete.
Loop the hardest four bars of a backing track or lesson recording, practise at reduced speed without the key changing, and nudge the tempo up as you improve.
Pro tips
Answers to common questions about the waveform audio player.
Yes. Space or K plays and pauses, ← and → jump five seconds (one with Shift), [ and ] change the speed, and L toggles the loop. The keyboard does what a pedal would, and your hands stay on the keys.
No. The player uses the browser's pitch-preserving playback, so voices and instruments keep their key at any speed between 0.5× and 2×.
Hours-long recordings play fine because playback streams from disk. Drawing the waveform requires decoding the whole file once, which for a two-hour stereo recording needs roughly 2–3 GB of memory. Very long files may be slow on low-memory devices.
This player is for listening and reviewing. To save a section as its own file, use the Audio Cutter. To convert formats, use the Audio Converter.
No. ToolEnhancer processes files on your own device inside the browser. They are never sent to, stored on or seen by our servers.
Yes. The waveform audio player is free to use with no sign-up, no watermarks and no daily limits.
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