Change Audio Speed Online - Free
Make audio faster or slower. Speeding up shortens the file and raises the pitch. Slowing down lengthens the file and lowers the pitch. This is how a tape machine works - speed and pitch are linked. If you need to change speed without affecting pitch, use the Pitch tool to correct afterward.
Make audio faster or slower. Speeding up shortens the file and raises the pitch. Slowing down lengthens the file and lowers the pitch. This is how a tape machine works - speed and pitch are linked. If you need to change speed without affecting pitch, use the Pitch tool to correct afterward.
Problems This Tool Solves
Sped-up audio sounds like chipmunks
Speed and pitch are linked in this tool. If you want faster playback without the pitch change, speed up first, then use Change Pitch to shift the pitch back down.
Slowed-down audio sounds grainy or phasey
Extreme slow-downs (below 0.5x) strain the resampling algorithm. Use a WAV or FLAC source file for cleaner results.
I want to listen to podcasts faster without installing an app
Upload the episode, set speed to 1.25x–1.5x, export. Most listeners find 1.25x–1.5x comfortable for speech.
Common Use Cases
Speed up a podcast or lecture
Listen at 1.25x–1.5x to get through content faster. Many regular podcast listeners use 1.5x or 2x daily.
Slow down for transcription
Set 0.75x to give yourself time to type while the audio plays. Common workflow for journalists and transcriptionists.
Slow a guitar solo for practice
Drop to 0.5x–0.75x to hear fast passages at a speed where you can follow each note.
Create a nightcore remix
Speed up a song to 1.2x–1.3x. The pitch rises with the tempo, giving the characteristic high-energy nightcore feel.
Learn a foreign language
Slow foreign speech to 0.7x–0.8x to catch individual words and pronunciation. Speed up gradually as your comprehension improves.
Learn dance choreography
Slow the music to half speed so you can break down moves step by step, then speed it back up as you get the routine down.
How to Change Audio Speed Online
- Upload your audio file to the editor.
- Set your desired speed with the slider. 0.5x is half speed, 2x is double speed.
- Click Apply. The audio is resampled to the new speed. Duration changes accordingly.
- Preview the result and export when it sounds right.
Change Speed vs Change Pitch - Key Difference
Change Speed
Changes speed AND pitch together. Faster = higher pitch, slower = lower pitch. Duration changes.
Best for: podcast speed-up, practice slow-down, nightcore, chipmunk effects, tape-style speed changeChange Pitch
Changes pitch WITHOUT changing speed. Duration stays the same.
Best for: key matching for karaoke, transposition, voice disguise, 432 Hz conversionRecommended Speed Ranges
| Goal | Speed | Notes |
|---|---|---|
| Transcription | 0.75x | Slow enough to type along, still natural-sounding |
| Music practice | 0.5x–0.75x | Hear individual notes clearly. Pitch drops noticeably. |
| Comfortable fast podcast | 1.25x–1.5x | Speech stays intelligible. Most listeners prefer 1.25x–1.5x. |
| Fast podcast (experienced) | 1.75x–2x | Requires attention. Speech is fast but still followable. |
| Nightcore remix | 1.2x–1.3x | Speed + pitch rise together for the nightcore aesthetic. |
| Slowed + reverb (daycore) | 0.8x–0.85x | Slight slow-down. Combine with reverb for the dreamy effect. |
Quick Tips
- Small speed changes (10–20%) produce the cleanest results with minimal artifacts.
- Higher quality source files (WAV, FLAC) handle speed changes better than compressed MP3s.
- Speeding up generally sounds cleaner than slowing down. Slow-down stretches samples and can introduce graininess.
- If the chipmunk effect bothers you when speeding up, use the Pitch tool afterward to correct the pitch back down.
- For music, separate vocals and instruments into stems before changing speed. Processing stems individually produces fewer artifacts than stretching a full mix.
Common Misconceptions
Myth: You can slow audio way down with no quality loss
Reality: Extreme slow-downs introduce graininess and artifacts. 10–50% speed changes produce the cleanest results. Higher quality sources handle stretching better.
Myth: Speed change and time-stretch are the same thing
Reality: Speed change links speed and pitch together (like a tape). Time-stretch changes speed while preserving pitch. This tool does speed change. Use the Pitch tool after to correct pitch if needed.
Common Problems and Fixes
Audio sounds like a chipmunk after speeding up
Speeding up raises pitch - that is expected. If you want faster playback without the pitch change, speed up first, then use Change Pitch to shift the pitch back down by the equivalent number of semitones.
Slowed audio sounds grainy or phasey
Extreme slow-downs (below 0.5x) push the resampling algorithm hard. Use a higher-quality source file (WAV or FLAC instead of MP3) for cleaner results.
Speech is too fast to understand
Back off from 2x to 1.5x. Most people find 1.25x–1.5x comfortable for speech. Above 2x, individual words start blurring together.
Why Use This Change Audio Speed Online
- Speed range from 0.25x (quarter speed) to 4x (quadruple speed)
- Resamples using linear interpolation for smooth results
- File duration changes proportionally to the speed
- Works with MP3, WAV, OGG, FLAC, AAC, M4A, and WebM files
- All processing runs locally in your browser
Frequently Asked Questions
Does changing speed also change the pitch?
Yes. Speeding up raises the pitch, slowing down lowers it. Speed and pitch are linked in this tool, just like speeding up a record or tape. If you want to change only pitch or only speed independently, use the Pitch tool.
What speed is best for audiobooks and podcasts?
1.25x to 1.5x is the sweet spot for most listeners. Speech stays clear and natural. Beyond 2x, comprehension drops significantly.
Can I speed up just part of a file?
Speed change applies to the entire file. To adjust only a section, trim it first, change the speed, then merge it back with the rest.
How do I make a nightcore remix?
Speed the song up to 1.2x–1.3x. The pitch rises automatically, giving the characteristic high-energy sound. Optionally add a slight reverb for polish.
What is the slowed + reverb effect and how do I make it?
Slow the track to 0.8x–0.85x with this tool, then apply Reverb with a long decay and high mix (40–70%). The pitch drops with the speed, creating the signature dreamy, submerged sound that originated from DJ Screw.
Why do some speed changes sound grainy?
Extreme changes (below 0.5x or above 2x) push the resampling algorithm hard. Compressed source files (MP3) show artifacts sooner than lossless (WAV/FLAC). For best results, use a high-quality source and keep changes within 10–50%.
What is the slowed+reverb trend and how do I make it?
Slow the track to 0.8x–0.85x here (the pitch drops with the speed), then apply Reverb with long decay and 40–70% wet mix. The sound originated with DJ Screw in Houston in the 1990s and went viral on YouTube and TikTok. Use the Reverb tool after speed change for the full effect.