Guides

How to Slow Down a Song Without Changing Pitch (Free, in Browser)

2026-10-11

Slow any track for practice, transcription or dance rehearsal while it stays in the original key. Which speeds sound clean, where time-stretching breaks, and how to export.

Most people who search for how to slow down a song are not making a slowed + reverb edit. They want to learn a guitar solo, work out a drum fill, rehearse choreography or type up lyrics they cannot catch at full speed. For all of those jobs the pitch drop that comes with ordinary slowing is a problem. A song at 0.75x with pitch following speed is almost five semitones lower, so every chord you try to play along with is wrong.

The fix is a time-stretch that keeps the key. In the free slow down song tool on this site that is one switch, labelled Preserve pitch. Flip it on, move the speed slider, and the track slows down while staying in tune. This guide explains what that switch actually does, which speeds sound clean, where it starts to fall apart, and how to get a file you can loop in a practice app or play in a dance studio. If you only want the quick version, the preserve pitch page has the editor at the top and a two-paragraph summary.

One limit to know first: the toggle is preview only

Preserve pitch applies to the live preview in the editor. Exported MP3s currently follow speed-linked pitch, so a 0.85x export is about 3 semitones lower regardless of the toggle. Use the editor to find the right speed and hear the song in key; the download will not be in key.

If you need a slower file in the original key, process it in Audacity, which is free:

1. Open the song and press Ctrl+A to select everything.
2. Effect, then Pitch and Tempo, then Change Tempo. Set Percent Change to -20 for 0.80x or -25 for 0.75x. Tick "Use high quality stretching".
3. Apply, then File, Export Audio, and save as WAV or MP3.

In a DAW, put the clip in a pitch-preserving stretch mode and change the tempo. The speed advice below applies to that output too.

What "without changing pitch" means in practice

Audio is a stream of samples. Play them back slower and two things happen at once: the song takes longer, and every frequency in it drops. That is how tape and vinyl behave, and it is the whole basis of slowed + reverb.

To slow a song without dropping the pitch you need to separate those two effects. The technique is called time-stretching. The audio is cut into tiny overlapping grains, each grain is played at its original pitch, and the grains are spaced further apart to fill the longer duration. Done well, your ear hears the same notes at a slower tempo. Done badly, you hear a metallic flutter, smeared transients and a watery quality on sustained notes.

In the editor, Preserve pitch switches between those two modes:

• Off (default): speed and pitch move together. 0.84x is roughly 3 semitones down. This is the slowed + reverb sound.
• On: speed changes, pitch stays. 0.84x is 0.84x tempo in the original key.

Everything else in the chain, including Reverb, Space, Bass, Tone and Width, works in either mode. For practice use you will normally leave Reverb at 0.

Step by step

1. Open the slow down music online editor and drop in your file. MP3, WAV, AAC, OGG and FLAC all work. Nothing is uploaded; the file is decoded in your browser.
2. Turn Preserve pitch on. Do this before you touch speed so you hear the right thing immediately.
3. Set Speed. Start at 0.80x. Press play and listen to a passage you know well.
4. Leave Reverb at 0%, Bass at 0, Tone at 0, Width at 1.0. The Dry preset gives you exactly that if you have been experimenting.
5. Adjust speed in small steps. 0.75x for hard passages, 0.90x once you can nearly keep up.
6. Export, if the pitch drop is acceptable. The download is an MP3 at 96 kbps, 32 kHz. Preserve pitch changes the live preview only; exported files keep the speed-linked pitch. For an in-key file, run the Audacity steps above.

The exported file has the new duration baked in, so a 4:00 song at 0.80x becomes a 5:00 file. Loop it in any player.

Which speeds sound clean

Time-stretching has a sweet spot. Small changes are nearly invisible. Large changes expose the grain structure. This table is for Preserve pitch on, with the typical use for each setting.

Two rules of thumb fall out of this. First, if you need slower than 0.70x, you probably want to loop a shorter section rather than slow the whole track further. Second, solo instruments and clean vocals survive stretching better than full mixes, because there are fewer overlapping transients for the algorithm to smear.

Why extreme speeds sound strange

Every time-stretch algorithm has to decide what a "grain" of audio is and how to overlap grains when it spaces them out. At 0.90x the overlap is tiny and the joins are inaudible. At 0.50x each grain has to be played twice over, and anything that is not perfectly periodic, like a snare hit or a consonant, gets duplicated. You hear it as a stutter on drums and a chorusing effect on voices.

Reverb tails and sustained pads suffer least. Percussion suffers most. That is why a slowed drum break with pitch preserved can sound like it was recorded in a tin can, while a slowed string quartet is fine at the same speed.

You cannot fully fix this in the browser editor, and we will not pretend otherwise. There is no transient-detection setting or algorithm selector. What you can do:

• Stay at 0.75x or above whenever the material allows.
• Pull Tone down 2 to 3 dB. The flutter lives mostly in the high end, and a darker top hides it.
• Keep Reverb at 0. Adding a room sound on top of stretch artifacts makes both worse.

Practice use: instruments

Guitarists, bassists, pianists and drummers have used slowed recordings since the days of half-speed tape, where the pitch dropped an octave and you had to transpose in your head. Preserve pitch removes that step.

A practical routine:

1. Make the song at 0.70x, 0.80x and 0.90x. For in-key files, use Audacity's Change Tempo at -30, -20 and -10 percent; exports from the editor will be lower in pitch.
2. Learn the passage at 0.70x until it is accurate, not fast.
3. Move to 0.80x only when you can play it three times in a row without a mistake.
4. 0.90x, then the original.

If the lower pitch does not bother you, you can do all three exports in one session in the editor. Add the same file three times, select one track at a time and set a different speed for each, then Download All for a ZIP. The bulk tool page covers the multi-track selection if it is new to you.

Two tips for players specifically. Boost Bass by 3 to 4 dB when learning bass lines, since the stretch can soften the attack of low notes and the shelf brings them forward. For guitar solos, a tiny Tone lift of +1 or +2 dB sharpens pick attack, which helps you hear articulation.

Transcription and lyrics

If you are writing out a melody, a chord chart or lyrics, you care about one thing: hearing each event clearly. Speed matters less than consistency, so pick one speed and keep it for the whole song, then use your player's seek bar to loop.

For fast rap verses, 0.75x with pitch preserved is usually enough to catch every syllable. For a dense horn arrangement where you need individual voices, 0.65x may be worth the artifacts. Transcribers often find that Width at 0 (mono) helps, because hard-panned parts that fight for attention collapse to the centre and you can focus on pitch rather than placement.

Dance and choreography

Dance teachers have the most straightforward need: the same song, same key, slower tempo, so the music still "feels" right while the class marks through a sequence. 0.85x and 0.75x are the two common rehearsal speeds, with 0.85x the first-week speed and 0.75x for learning a complex eight-count.

For in-key rehearsal files, render with Audacity's Change Tempo. Because you will play these files in a studio over a speaker system, a couple of things matter more than they do on headphones:

• Keep Width at 1.0. Wide stereo can thin the bass on a PA that sums to mono.
• Do not boost Bass past +3 dB. Studio systems are often already bass-heavy.
• Export the whole song, not a cut. You can skip to the section you need from the player.

If you also run a slowed version with pitch following speed for a performance piece, that is a separate export with Preserve pitch off. The best speed guide covers that choice.

Preserve pitch on vs off: a quick comparison

Neither mode is "better". They answer different questions. If someone asks how to slow down a song without changing pitch, they want the right-hand column.

Speeding up without changing pitch

The same switch works above 1.00x. A 1.10x or 1.15x run-through with pitch preserved is a useful final step before playing at full tempo, because if you can hold a passage slightly faster than needed, the real speed feels relaxed. Artifacts above about 1.25x behave like the slow-side ones in reverse: grains are removed rather than duplicated, and drums start to sound clipped. For sped up edits where you actually want the pitch to rise, see the speed up song tool and leave Preserve pitch off.

Common problems

The track sounds like it is underwater. You have Reverb above 0. Load the Dry preset and start again, then re-enable Preserve pitch.

Drums sound doubled. You are below 0.70x. Either raise the speed or accept it for a short section. Pulling Tone to -3 dB softens the effect.

The key still seems off. Check that Preserve pitch is actually on. Also remember that some recordings are not at concert pitch to begin with. Old records and some modern pop are tuned slightly sharp or flat, and the editor cannot correct that; it only preserves whatever the file already has.

The export is longer than expected. That is correct. Slowing to 0.80x makes a file 25% longer because duration is 1 divided by speed.

It is slow to export on my phone. Mobile browsers encode in the background but on a slower processor. A four-minute track usually finishes in under a minute on a recent phone; older phones take longer. Nothing is uploaded, so there is no server queue to wait for.

Limits to know before you start

The editor does a lot for a free browser tool, but it is not a DAW. It cannot:

• Shift pitch independently of speed (no "transpose by two semitones" control).
• Loop a selection or set A/B markers. Use your player for that.
• Trim the file to a section. Export the whole song.
• Export WAV or FLAC. Output is MP3 at 96 kbps, 32 kHz, which is fine for practice and rehearsal but not a lossless master.
• Export a pitch-preserved file; the MP3 follows speed-linked pitch.

If you need any of those, slow the track here for a quick check, then move to Audacity or Reaper for the detailed work. The Audacity comparison explains where each tool wins.

Open the free editor: upload MP3, WAV, AAC, OGG or FLAC, adjust speed, reverb, bass, tone, width and space, then export MP3 or a ZIP of many tracks. Everything runs in your browser.