Slow Down Audio Online Free
Slow Down Audio is a free audio speed changer, online and in your browser — slow down a song, a recording, or the audio from a video, then download the result. Keep the original pitch so vocals and instruments still sound natural, or let the pitch drop for a deeper effect. There is no upload, no account, and no watermark: your file is processed on your own device, so it stays completely private.
Need to slow a track down for practice, transcription, or a remix? Do it in a few taps.
Use the free Slow Down Audio tool →What is Slow Down Audio?
Slow Down Audio is a browser-based tool that lowers the playback speed of any audio or video file. It works as a free audio speed changer, online, letting you set any speed from a gentle 0.99× down to a quarter of the original at 0.25×. Because it runs entirely on your device, you can change the speed of an audio file, online and free, with no sign-up and no file going to a server. The output is a clean MP3 or WAV you can save and use anywhere.
How to slow down audio without changing pitch online
Most ways to slow audio drop the pitch along with the speed, which makes voices sound deep and muddy. This tool keeps pitch and speed independent, so you can do either. Here is the full flow:
- Choose a file — tap the dropzone to pick an audio or video file, or drag one in. MP3, WAV, M4A, MP4, and MOV all work.
- Set the speed — drag the large Speed slider to your target, anywhere from 0.25× to 0.99×. Press play to hear the slowed effect live before you export.
- Toggle Preserve Pitch — leave it on to keep the normal pitch (best for music and speech), or turn it off to let the pitch drop with the speed for a chopped-and-screwed sound.
- Save audio — tap Save Audio and the slowed file downloads to your device.
The two modes cover two different jobs. Preserve-pitch slowdown is a true audio tempo changer, online and free — the tempo eases off while the melody and voices stay in tune. Pitch-dropping slowdown is the classic remix effect, where the whole track sinks lower as it slows.
Use cases: music practice, transcription, and more
Slowing audio down while holding the pitch is useful far beyond editing. Common reasons people reach for it:
- Music practice — slow a fast solo or riff to half speed to learn it note for note, then bring it back up as you improve.
- Transcription — slow an interview or lecture so you can keep up while typing, without the speaker sounding distorted.
- Language learning — slow down a podcast or dialogue to catch every word and follow a fast or unfamiliar accent.
- Lyrics and remixes — slow down a song, online and free to transcribe the words, or drop the pitch for a creative edit.
How to export your slowed audio
Open Export settings on the configure screen to control the output:
- Format — MP3 is compressed and small, and plays on every device; WAV is uncompressed and lossless, ideal if you will edit the result further.
- Normalize volume — turn this on if the slowed track sounds too quiet and you want the loudness evened out.
Files up to 250 MB are supported — large enough for full songs and long recordings. If you are working with video too, you can trim a video clip or turn a video into a GIF, or convert an MP3 to WAV with the other free, private tools on Capsule Tools — all in your browser, with no upload.
Frequently asked questions
How do I slow down audio without changing the pitch online?
Drop your file in, leave the Preserve Pitch toggle on, and drag the Speed slider down to your target rate — say 0.5× for half speed. The tool uses a time-stretching filter so a voice or instrument keeps its normal pitch even when it plays much slower. Tap Save Audio and the slowed file downloads to your device.
Can I use this as an audio speed and pitch changer online free?
Yes. The Speed slider and the Preserve Pitch toggle together act as a free speed-and-pitch changer. Keep Preserve Pitch on to slow the audio while holding the pitch steady, or turn it off to let the pitch drop naturally with the speed for a deeper, chopped-and-screwed sound. It is completely free with no account.
Does this work as an audio tempo changer online free?
It does — slowing the audio lowers its tempo without re-recording anything. Set the Speed slider to the tempo you want and export an MP3 or WAV from the Export Settings panel. Because everything runs in your browser, there is no upload wait and no usage limit.
How do I change the speed of an MP3 without changing the pitch?
Choose your MP3, set the Speed slider to your target, and make sure Preserve Pitch is on. Pick MP3 in Export Settings, then tap Save Audio. The browser processes the file locally and downloads a new MP3 at the slower speed with the original pitch intact — nothing is uploaded.
Can I slow down audio on iPhone for free?
Yes. The tool runs entirely in your mobile browser — Safari on iPhone and iPad, or Chrome on Android — so there is no app to install. Open the page, pick a file from your phone, slow it down, and save it straight to your downloads. It works the same on a phone as on a desktop.
Is my audio file uploaded to a server?
No. Your file never leaves your device. The slowing, the live preview, and the MP3 or WAV export all happen inside your browser using WebAssembly. Because nothing is uploaded, the tool is private and keeps working even when you are offline once it has loaded.