How to slow down music on iPhone and Android without an app
Slowing a track from your phone without installing anything: what works in a mobile browser, where the exported file lands, and the limits specific to iOS and Android.
The steps at a glance
- Open the converter in your browser. Safari on iPhone, Chrome on Android. No installation required.
- Import the file. On iPhone, go through the Files app. On Android, through storage or downloads.
- Set the speed. Drop to 0.90× to start, then adjust by ear.
- Listen on headphones. A phone speaker does not reproduce bass: judge on headphones, then re-check on the speaker.
- Export. The file saves to your downloads, or opens the share sheet on iOS.
The short answer
You do not need an app. Modern mobile browsers can process audio directly through the Web Audio API. In practice: you open a page, load your track, set the speed, download the result.
Effects processing runs on your device, which has a practical upside: your connection quality only matters for loading the page itself.
On iPhone (iOS)
Open Safari — Chrome on iOS uses the same engine, so behaviour is identical.
To import a file, tap the import button: iOS offers the Files app. If your music lives in the Music app and came from a purchase or subscription, it is protected and cannot be exported — that is an iOS restriction, not a tool limitation. Files you downloaded or saved into Files yourself work fine.
After export, the file lands either in Downloads or in the share sheet, depending on your settings. From there you can save it into Files or send it straight to another app.
One caveat: avoid locking the screen while a long file is processing — iOS may suspend the background tab.
On Android
Chrome, Firefox and their derivatives all work. Import goes through the system file picker, which reaches internal storage, downloads, and an SD card if you have one.
The export lands in your Downloads folder, where any file manager or your manufacturer's Files app will find it.
Android places fewer restrictions on file access than iOS, so the process is generally more direct.
The real limits on mobile
File size. A phone has less memory than a computer. On a very long file — an hour-long mix, a DJ set — processing may fail or stall. Under ten minutes, everything runs normally.
Judging by ear. This is the real difficulty. A phone speaker reproduces almost nothing below 200 Hz. You therefore cannot judge bass boost on it — and yet that is the kind of speaker most people will use to hear your result. The right method: set it on headphones, then check on the speaker that the track does not collapse.
Background tabs. On both systems, leaving the browser during a long process can interrupt it. Stay on the page.
Is an app better?
A native app helps if you process very large files, or want to work fully offline. For everyday use — slowing a track, making a slowed version for a story — the browser does the job without taking up storage or asking for permissions.
Which settings on mobile?
Exactly the same as on desktop: 0.90× for a classic slowdown, 15 % reverb if you are after slowed and reverb, 12 % bass boost to compensate. Our tutorial on slowing songs covers each range.
Frequently asked questions
Can you slow down music on iPhone without an app?
Yes. Safari can process audio directly through the Web Audio API. You import the file from the Files app, set the speed and export, with nothing to install.
Why can't I import a song from Apple Music?
Tracks from an Apple Music subscription or purchase are protected and cannot be exported. That is an iOS restriction. Only files you own and placed in Files can be used.
Where does the file go after export on Android?
In the Downloads folder, reachable from your phone's Files app or any file manager.
Is there a file size limit on mobile?
In practice, files under ten minutes process without trouble. Beyond that, available phone memory can become the limiting factor, especially on older devices.