Local processing. No uploads. No account needed.
Free Online Audio Speed Changer
Speed up or slow down audio from 0.25× to 2×. Keep the pitch, preview a waveform and download MP3, WAV or other formats. Free, local and no sign-in.
Audio Speed Changer
Your audio stays in this browser. Nothing is uploaded or saved to your account.
How to Use the Audio Speed Changer
Choose a local recording, set the speed and pitch mode, then preview it. Apply the speed to render a new file and download it. The original file stays unchanged.
01
Choose an Audio File
02
Speed
03
Download Audio
Audio Speed Changer: Tempo and Pitch Explained
Tempo is how quickly the audio moves; pitch is how high or low it sounds. Keep pitch is on by default. Switch it off for a tape-style effect, where speed and pitch change together.
Duration example · 1 minute of audio
Audio Speed Changer for Music Practice
Slow down a fast guitar phrase, a piano passage or a vocal run to hear its timing. Keep pitch enabled to practice in the original key, then work back toward 1× as you learn.
Audio Speed Changer for Speech and Study
Slow a spoken phrase to study pronunciation, or speed up a lecture, interview or podcast for review. Choose a pace that remains understandable, then save a separate listening copy.
Audio Speed Changer with Five Export Formats
Open MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WebM audio or AIFF when your browser can decode them. Export MP3 for compatibility, M4A for AAC, WAV for PCM editing, or FLAC and OGG for other workflows.
Your Audio
MP3 / WAV / M4A / AAC / FLAC / OGG / Opus / WebM / AIFF
Output Format
MP3 / WAV / M4A / FLAC / OGG
Why Use This Audio Speed Changer?
Your audio is processed on this device. No account, subscription, credits or media upload is needed. The browser downloads the processing engine; it does not send your recording to MusicGo or R2.
Audio Speed Changer Limits and Sound Quality
Desktop files can be up to 50 MB and mobile files up to 20 MB. Decoded-memory checks and a 20-minute output limit protect the browser. Strong time stretching may add artifacts; preview and compare the exported result.
Audio Speed Changer in Your Editing Workflow
Change the whole recording here. To trim a section, combine clips or reduce the file size, continue with Audio Cutter, Audio Joiner or Audio Compressor. Each tool has a separate purpose.
Audio Speed Changer FAQs
Is this Audio Speed Changer free?
Yes. Choose, preview and export audio without signing in, paying or using credits. Processing takes place in your browser.
How do I change the speed of an audio file?
Choose a file, set a speed below 1× to slow it down or above 1× to speed it up, then apply the speed and download the rendered result.
Can I change audio speed without changing pitch?
Yes. Leave Keep pitch on. Export uses tempo processing to preserve the key or speaking pitch, although extreme settings can introduce audible artifacts.
How do I make a slowed-down or sped-up effect with a pitch change?
Turn Keep pitch off. Slower playback lowers pitch and faster playback raises it. This tape-style change is also applied to the exported file.
What speed range and custom settings are available?
Choose 0.25×–2× using presets, the slider or a numeric value. The default is 1×; the numeric control supports hundredths within that range.
Will my downloaded file play at the new speed?
Yes. Apply speed renders a new audio file with the timing change. It is not just a temporary playback-rate setting on the original file.
How is the new audio duration calculated?
Divide the original duration by the speed. A 60-second recording at 0.5× is about 120 seconds; at 2× it is about 30 seconds. Codec padding can cause small differences.
Which audio formats can I open and download?
Inputs include MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WebM audio and AIFF, subject to browser decoding support. Download MP3, PCM16 WAV, AAC/M4A, FLAC or OGG Vorbis.
Can I change MP3 speed and choose the bitrate?
Yes. Choose MP3 output and 128, 192, 256 or 320 kbps. A higher bitrate generally makes a larger file; re-encoding cannot restore detail missing from the source.
Does the Audio Speed Changer work on phones?
The editor supports narrow screens and touch controls. Limits are 20 MB on mobile and 50 MB on desktop, with additional decoded-memory checks and a 20-minute output limit.
Does changing audio speed reduce sound quality?
Time stretching may add artifacts, especially near the speed limits. MP3, M4A and OGG also use lossy encoding. WAV or FLAC avoids another lossy codec stage but does not reverse existing losses.
Is my audio uploaded or stored in my account?
No. The selected file and rendered result stay in this browser session. Download the result before leaving. Initial engine loading requires a connection; this is not a guaranteed offline app.
Can I trim clips, process a batch or detect BPM here?
This page changes one full recording at a time. It has no batch processing or automatic BPM detection. Use Audio Cutter to choose a shorter section before changing speed.
Why is processing slow or failing?
The first export downloads an engine, and longer recordings take more device resources. Keep the tab open, try a smaller supported file or cancel and retry. A browser-decoding error requires a different supported file or format.
Find Your Pace with the Audio Speed Changer
Make a practice copy, review a recording or change the feel of a track. Choose a file to begin.