Audio Tools
Audio Speed Changer
Speed up or slow down audio from 0.25x to 4x with pitch preservation option.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop audio file or click to upload
MP3, WAV, OGG, FLAC, AAC, M4A
🔒 Your audio files are processed in your browser. Nothing is uploaded.
Embed this tool on your website
Copy this code to add the Audio Speed Changer to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/audio-speed" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Audio Speed Changer by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/audio-speed">OptiPix Audio Speed Changer</a></p>
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About Audio Speed Changer
Last updated: May 2026
OptiPix Audio Speed Changer lader dig justere afspilningshastigheden af enhver lydfil fra 0,25x (kvart hastighed) til 4x (firedobbelthastighed) direkte i din browser. Vælg at bevare tonehøjden (tidsstrækning for naturlig lyd) eller tillad tonehøjdeændring (chipmunk-effekt ved høj hastighed, dyb stemme ved lav hastighed). Forudindstillede hastighedsknapper til almindelige værdier. Eksporter i MP3, WAV, OGG, FLAC eller AAC. Bruger FFmpeg.wasm's atempo-filter til tidsstrækning af høj kvalitet.
How It Works
Værktøjet bruger FFmpeg.wasm's atempo-filter til hastighedsændringer med bevaret tonehøjde (kæder flere atempo-instanser for hastigheder uden for 0,5-2,0-området) eller asetrate/aresample til hastighedsændringer med tonehøjdeændring.
Use Cases
- •Fremskynd podcasts for hurtigere lytning
- •Sænk musikken for øvelse
- •Fremskynd forelæsningsoptagelser
- •Skab slow-motion lydeffekter
- •Juster lydbogsafspilningshastighed
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If you find Audio Speed Changer useful, check out these related tools: Audio Trimmer, Audio Volume Booster, and Audio Effects. All tools run entirely in your browser with no uploads or signups required.
Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
Frequently Asked Questions
Kan jeg bevare tonehøjden?
Hvilket hastighedsområde understøttes?
Uploades min lyd?
Hvordan virker bevarelse af tonehøjde?
Hvilke formater understøttes?
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