How to Slow Down a Song (Without Changing the Pitch)
The easiest way to practice along with a recording is to slow it down. loope does this in your browser — no upload, no signup, and the pitch stays exactly where it should.
Why Slowing Down a Song Helps You Learn Faster
When a song plays too fast to follow, your brain spends all its effort guessing at notes instead of actually learning them. Slowing the recording down gives you the time to hear each note clearly, match it on your instrument, and lock in muscle memory. This is how professional musicians have transcribed solos for decades — first with vinyl records at 16 rpm, then with cassette tape, then with dedicated software like Transcribe! or Amazing Slow Downer. The modern approach is simpler: a browser tab. loope slows tracks down with a time-stretch algorithm (Signalsmith Stretch) that keeps the pitch intact, so a song in the key of A stays in A at 50% speed. No weird chipmunk or demon-voice artifacts.
Step 1: Load Your Track
Open loope.studio and drag an audio file onto the uploader. MP3, WAV, FLAC, and OGG all work. The file stays on your device — loope processes everything locally in your browser using WebAssembly, so nothing gets uploaded to a server. If the song is on YouTube or Spotify, you'll need to download or rip it to a local file first. loope does not stream from URLs (that's a copyright gray zone most browser tools avoid).
Step 2: Set Your Practice Speed
The speed slider runs from 0.25× (four times slower) to 2× (twice as fast). For learning, the sweet spots are: • 75% — challenging but honest, good for second-pass practice • 50% — half speed, common for untangling fast passages • 65% — a compromise when 50% feels too slow and 75% too fast Move the slider, hit Play. The track slows down immediately. Because loope uses time-stretching (not resampling), the pitch stays the same — a C is still a C.
Step 3: Loop the Tricky Part
You rarely need to slow down an entire song. Usually there's one lick, one chord change, one phrase that trips you up. Click once on the waveform to set point A, click again to set point B. loope plays that segment on repeat at your chosen speed. Spend 20–30 repetitions on that loop at 50%, then bump to 65%, then 80%, then full speed. This is called progressive speed training and it's the single most effective way to learn a difficult passage.
Start a loop in loopeStep 4: Export Your Slowed Version
If you want a permanent slowed-down copy — for phone practice without opening the tool, or to share with a teacher — hit Export. Choose WAV (lossless, larger file), MP3 (compressed, smaller), FLAC (lossless + compressed), or OGG (open-source lossy). The export runs the same time-stretch engine, so the saved file sounds identical to what you hear in the browser.
Try it now in Loope
Drop a track. Slow it down. Loop the tricky part. Change the key. All in your browser — no upload, no signup.
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Frequently Asked Questions
A tiny bit, yes. Time-stretching introduces some artifacts — usually inaudible at 75% speed, more noticeable at 25%. The WAV and FLAC exports avoid compression loss; MP3 and OGG exports re-encode which adds a small additional loss. For practice, none of this matters.
Speed changes how long the track takes to play. Pitch shifts the notes up or down in key. Old-school record players coupled the two (slower = lower), but loope keeps them independent. You can slow a song to 50% speed and leave the pitch alone, or keep the speed and transpose it down 2 semitones. Both at once is also fine.
Not in loope. Below 25%, time-stretch artifacts become obvious and the audio starts sounding gelatinous. If you truly need that, Audacity's Paulstretch effect handles extreme slowdowns (it's designed for 10×–1000× stretching, more for ambient textures than practice).
YouTube uses a simpler time-stretch that's optimized for speech, not music. It's fine for 0.75× and 0.5× but introduces noticeable warble on polyphonic instruments. loope uses a phase-vocoder-based algorithm tuned for music, which handles chords and percussion more cleanly.
Yes. Free with no account. No watermark on exports. No file size limit beyond what your browser can hold in memory. No upload, so your audio stays private.