How to change audio speed on a Mac without changing the pitch
By Himanshu Ranjan · Updated 8 November 2026
For a quick 1.5 times speed-up, run Edit › Speed up 1.5× in FileDial. To choose your own speed and keep the voice at its natural pitch, use Edit › Change tempo (keep pitch)… Both save a new copy beside the original, work offline and never upload the file.
Speed and tempo are not the same thing
Playing audio faster in the simplest way raises its pitch, so voices turn chipmunk-like. Changing tempo while keeping pitch stretches or squeezes time without moving the pitch, so a speaker still sounds like themselves. Which you need depends on the job.
FileDial has both, and the labels tell you which is which: Edit › Speed up 1.5× is the quick, fixed option, and Edit › Change tempo (keep pitch)… lets you pick the amount and holds the pitch. If you want a different pitch on purpose, Edit › Change pitch… changes it with the same length.
Speed up or slow down with FileDial
- Select the audio file in Finder.
- Hold the right Option key to open the dial.
- For a quick speed-up choose Edit › Speed up 1.5×. For a custom amount choose Edit › Change tempo (keep pitch)…, then enter the amount when asked.
- Open the new copy beside the original and listen for artifacts.
Which settings suit which job
Lectures, audiobooks and long meetings are usually comfortable somewhat faster than natural speed, but the limit is personal and depends on the speaker. Try a small change first and increase it if you still follow easily. Music is more sensitive: stretching tempo too far makes drums smear and sustained notes warble, so keep changes modest.
For slowing down, for example to transcribe a fast speaker or learn a passage, use the tempo tool with a value below normal. Slower audio is easier to catch by ear, though extreme slow-downs sound watery.
Do the clean-up before the speed change
Noise gets stretched along with the voice. If the recording has hiss, run Clean › Clean up voice first. Clean › Remove silences… can shorten a long recording before any speed change is applied, which is often the better way to save time. Remove dead air, then speed up modestly.
If you only want to listen faster, many podcast apps and media players have their own playback speed control, so a permanent copy is only needed when you want to share or keep the faster file.
Related effects
Edit › Reverse plays a clip backwards, and Edit › Change pitch… shifts pitch while keeping the length. Together with the speed tools they cover most simple sample and effect jobs, each saving a new copy.
Choosing a speed that stays intelligible
There is no universal number. Speech at natural pace for a clear speaker can usually be sped up modestly before it tires the listener, while a fast or accented speaker needs less. Try small steps and listen to a full minute, not just a few seconds, because fatigue shows up slowly. For learning or transcribing, go the other way and slow it down, then speed back up once the content is familiar.
Edit › Speed up 1.5× is a large step for a first try. If that is too much, use Edit › Change tempo (keep pitch)… with a smaller value instead of repeating a fixed tool several times, which compounds artifacts.
Mistakes, and how to check the result
The common mistakes are changing speed when you meant to change pitch, running a speed-up on an already lossy file several times, and speeding up before removing noise. Another is judging by laptop speakers: artifacts from stretching are easier to hear on headphones, so check there.
Always compare against the original. FileDial saves the new file beside it, so open both and listen to the same passage. Quick Look in Finder plays audio when you press the space bar, which is a fast way to audition copies. If you need to keep the result, Convert › Convert to MP3 or Convert › Convert to M4A produces a small, shareable copy.
Using it for study and practice
Slowing audio is popular for learning music and languages. Slow a difficult passage with the tempo tool, practice along, and move toward the original speed over several sessions. Because the pitch is held, you can play along on an instrument without retuning. Making separate files for each speed is tidy: name them with the speed in the title, for example lesson 80 percent, so you can pick the right one. If you only need to hear a phrase again, Edit › Trim… cut to that phrase first, then slow it, since a short file is quicker to process and easier to loop in a player.
No uploads
Speeding up a recording should not need an account or an upload. FileDial runs every tool on your Mac and never uploads a file, and all tools work with Wi-Fi off.
Questions
How do I speed up audio without changing the pitch?
Use Edit › Change tempo (keep pitch)… in FileDial. It changes the playback time and holds the voice at its natural pitch. The quick Edit › Speed up 1.5× option is also available when you do not need a custom amount. The tempo tool is built for exactly that case, and it avoids the high, thin voice that a plain speed change produces.
Is it better to speed up the file or just use my player's speed setting?
If you only listen, the player setting is enough and changes nothing on disk. Make a new faster file when you need to share it, play it on a device without speed control, or keep a shorter version. Playback-only settings are quicker for private listening, but a saved file is the only way to share the faster version or play it on basic devices.
Will speeding up make the audio sound worse?
Large changes can add artifacts such as warbling or smeared transients, especially in music. Small changes on speech are usually clean. FileDial writes a copy, so you can compare against the original and try a milder setting. Test a small change on a minute of audio first, since speech tolerates modest changes but music shows artifacts sooner.
Can I change the speed of many files at once?
Yes. Select multiple files in Finder and run the tool once. FileDial processes the selection and saves a new copy of each. Settings you enter apply to every file in that run. Enter the value once and the same setting applies across the whole selection, so group files that need the same change.