2Choose a multiplier — 0.5x for half speed, 2x for double — staying roughly inside 0.75x to 2x if the content is speech.
3Run it; the time-stretch preserves pitch, so voices stay natural instead of transposing upward.
4Download the retimed Audio file with picture and sound still in sync.
Change Audio Speed FAQ
Does the source format affect the result?
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It does. this format is read and written by the same streaming pipeline as everything else we support. That determines whether the retimed result can be written back cheaply or has to be fully re-encoded.
Anything specific to Audio here?
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Yes — the codec is detected from the stream, so a mislabelled extension does not derail the job. Worth knowing before you commit to a large speed change.
How far can I push the speed before it sounds wrong?
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Roughly 0.75x to 2x is transparent for speech. Beyond about 2.5x the stretch artefacts become audible on any algorithm, and below 0.5x the reconstruction has to invent too much. Music tolerates far less than speech does.
Do picture and sound stay in sync?
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Yes. Both are retimed by the same factor in one operation, so they cannot drift apart — which is the usual failure when speed is changed by editing the two streams separately.
Can I run Change Audio Speed on several audio files at once?
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Yes. The set queues in parallel with identical settings, which is how you process an album or a podcast back catalogue without repeating yourself.
Do tags and cover art survive?
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Yes — ID3, Vorbis comments and MP4 atoms are carried across along with embedded artwork, so processed files still sort correctly in a music library.
Does Change Audio Speed cost anything?
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No. Change Audio Speed is free with no account, and nothing is added to the audio. Uploads are deleted from the workers shortly after the job completes.
Is there a file size limit on Change Audio Speed?
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Yes: free accounts process audio up to 15 MB per file whichever codec you brought; ffmpeg handles the decode and encode. In practice that limit only bites on uncompressed WAV; a compressed file of the same length is nowhere near it.
Why does a PNG site host Change Audio Speed?
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PNG.to is built around the format you use when you cannot afford to lose a pixel: lossless, alpha-capable, and the correct answer for screenshots, logos, line art and anything with hard edges. Image work is rarely one step: people arrive to change a format and leave needing the picture a different size, a different weight or a different shape. Running Change Audio Speed on the same upload pipeline, the same size caps and the same account is the whole reason it is here rather than on a fourth tab.
What should I do with the result once Change Audio Speed is finished?
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The converter on this site moves images to and from PNG, JPG, WebP, GIF and SVG — which is the step where the decision about transparency actually gets made. That is the step most people actually came for, and doing it after Change Audio Speed rather than before it means the conversion works from the file you finally settled on.
Is Change Audio Speed here the same tool the sibling sites run?
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The engines are shared — the same libraries, the same workers, the same limits. What differs is the advice, and the advice here starts from one fact about the format this site is named after: there is no quality slider to get wrong — a PNG round-trips bit-exactly, so the only thing edits cost you is file size. A PNG site is opinionated about where PNG is the right destination and where it is not, and that judgement is worth more than the button.
Do I need an account, and does anything get kept?
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No account, and nothing is kept: uploads are deleted from the workers shortly after the job finishes, and nothing you process is indexed, listed or used for anything else. Free accounts exist for history and batch size, not for access.
