Audio Speed Changer Online
Speed up or slow down any audio file in your browser. This free MP3, voice, and music speed changer lets you pick 0.5×, 0.75×, 1.25×, 1.5×, or 2× speed — download the result as MP3. No sign-up, no upload.
Change Audio Speed in 3 Steps
No account. No upload. Just drop your file, pick a preset, and download.
Upload the Audio
Drag and drop an audio file onto the tool or click to browse. Files up to 200 MB.
Pick a Speed Preset
Tap 0.5×, 0.75×, 1.25×, 1.5×, or 2×. The new duration is calculated live so you know what to expect.
Apply & Download MP3
Click Apply Speed & Download. The file is encoded at 192 kbps and saved straight to your device.
Why Notevibes Audio Speed Changer
Five presets, one button, honest about the tradeoffs.
5 Speed Presets
Pick from 0.5×, 0.75×, 1.25×, 1.5×, or 2× with a single tap. No sliders, no fiddling — the common speeds people actually use.
Instant Processing
Most files process in well under a second. The browser does the math locally with the Web Audio API — no wait, no queue.
Privacy First
Your file is processed in your browser. Nothing is uploaded to a server, nothing is stored, nothing is tracked.
Any Audio Format
Drop MP3, WAV, M4A, FLAC, OGG, AAC, or WebM. Anything your browser can decode will load.
MP3 Output
The result is encoded at 192 kbps and saved directly to your device. The filename includes the speed rate so you never lose track.
Works on Mobile
Change speed on your phone or tablet. Runs on iOS, Android, Chrome, Firefox, Safari, and Edge.
Heads up: pitch changes with speed
This is a naive speed change — the same thing a vinyl record does when spun at the wrong RPM. Speeding up raises the pitch (chipmunk effect); slowing down lowers it. That is perfect for nightcore edits, quick podcast speed-ups, or language practice, but if you need pitch-preserving time-stretching, grab Audacity or a DAW instead.
Your File Stays on Your Device
Every file is processed locally in your browser using the Web Audio API. Nothing is uploaded, stored, or analyzed.
No Upload
File never leaves your device
No Account
Start changing speed immediately
No Tracking
We never see your file
What You Can Do With a Speed Changer
Five presets cover the most common real-world use cases.
Faster Podcasts
Speed up podcasts to 1.25× or 1.5× so you can get through more episodes in the same time
Music Practice
Slow down tricky passages to 0.5× or 0.75× to learn solos, riffs, or transcribe by ear
Nightcore Edits
Create classic nightcore and sped-up remixes at 2× for TikTok, Reels, or YouTube Shorts
Slow Down Dictations
Drop dictations and interview recordings to 0.75× so you can transcribe without rewinding
Faster Audiobooks
Speed up audiobooks for faster consumption without juggling separate player apps
Language Learning
Slow down foreign-language clips to 0.5× or 0.75× to catch every word and mimic the accent
Need More Than Speed Changes?
The full Notevibes Online Audio Editor lets you trim clips, mix multiple tracks, add fades, remove vocals, clean up podcasts, and export to MP3 or WAV — all in your browser.
Open Full Audio EditorConvert Any Audio Format
Free browser-based converters for every major audio format — no sign-up, no upload.
Related Audio Tools
More free browser audio tools from Notevibes — no sign-up, no upload.
Audio Tempo Changer
Speed up or slow down while keeping pitch unchanged.
Audio Pitch Changer
Shift pitch up or down without changing duration.
Audio Reverser
Play any audio file backwards.
Voice Changer
Chipmunk, helium, deep, giant, or demon voice effects.
Audio Normalizer
Boost audio to peak volume without clipping.
MP3 Editor
Full MP3 editor with timeline, effects, and export.
Frequently Asked Questions
How do I change audio speed online?
Drop your audio file onto the tool, pick one of the five preset speeds (0.5×, 0.75×, 1.25×, 1.5×, or 2×), and click Apply Speed & Download. The result is encoded as a 192 kbps MP3 and saved straight to your device. Everything runs in your browser — nothing is uploaded.
How do I speed up an MP3 or voice online?
Drop your file onto the MP3 speed changer, pick a faster preset (1.25×, 1.5×, or 2×), and click Apply Speed & Download. It works the same to speed up an MP3, a voice recording, or a song — handy for nightcore edits, faster podcasts, and quicker audiobook listening. The sped-up MP3 saves straight to your device.
Can I slow down audio online?
Yes. To slow down audio online, drop your MP3 in and pick 0.75× or 0.5×. The slower file is great for transcribing dictations, learning a tricky music passage, or catching every word in a foreign-language clip. Works as a voice speed changer and music speed changer too, and the slowed-down result downloads as an MP3.
Does pitch change too when I change the speed?
Yes, and we want to be upfront about it. The pitch rises when you speed up and drops when you slow down. This is naive speed change, the same thing that happens when you spin a vinyl record at the wrong RPM — it is not time-stretching. For pitch-preserving speed change you need professional software like Audacity with the SBSMS/Sliding-Stretch effect, iZotope RX, or a full DAW.
What are the preset speeds?
There are five presets: 0.5× (half speed, an octave lower), 0.75× (gentle slowdown), 1.25× (slightly faster), 1.5× (the common podcast speed), and 2× (double speed, great for nightcore edits and faster podcast listening).
Is the audio speed changer free?
Yes. Completely free, with no sign-up, no watermark, no ads, and no limits on how many files you can process. Max file size is 200 MB per upload.
Is my file uploaded to a server?
No. The audio speed changer runs entirely in your browser using the Web Audio API. Your file never leaves your device — nothing is uploaded, stored, or analyzed.
What format is the output file?
The output is a 192 kbps MP3. The filename includes the speed rate, for example song-1.5x.mp3, so you can always tell at a glance which version you are listening to.
Can I chain speed changes?
Yes. After downloading the first result, drop the new MP3 back into the tool and apply another preset. Chaining works, but each pass is a fresh MP3 encode — try to pick the right speed in a single pass when you can to avoid stacked compression artifacts.
Does it work on mobile?
Yes. It runs on iOS and Android in Chrome, Firefox, Safari, and Edge. Tap to upload a file, tap a preset, tap Apply Speed & Download — that is all it takes.
Can I create audiobooks with Notevibes?
Yes. The AI audiobook generator turns your book into a narrated audiobook with automatic chapter splitting, character detection, and 550+ AI voices in 72 languages. Step-by-step guide.