Does Audio Speed upload my file or text to Tool-You servers?

No. Audio Speed runs in this browser tab. Files stay on the device. Limit note: Audio only. 0.25×–4× chained atempo. Output MP3. Pitch follows tempo. Max 100 MB.

Should I use Video Speed instead of Audio Speed?

Use Audio Speed when you need Change playback rate with chained atempo. Use Video Speed when you need Speed up or slow down a video. They share a category (Audio) but not the same job.

Audio Speed

Change playback rate with chained atempo.

Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine.

What Audio Speed does

Practical limit for Audio Speed: Audio only. 0.25×–4× chained atempo. Output MP3. Pitch follows tempo. Max 100 MB. That is why output can differ from heavy desktop Audio software. Read the tool-specific note again: Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine.

How to use Audio Speed

Stay on this Audio Speed page (/audio/speed-audio). Do not switch to Video Speed unless you actually want Speed up or slow down a video..
Add the file type Audio Speed accepts. Hint from the path: audio · speed audio. Change playback rate with chained atempo.
Set only the options that match Audio Speed. Neighbor Trim Audio does something else (Cut an audio file by time range.). Tool note: Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine.
Run Audio Speed in this tab. Browser memory still applies: Audio only. 0.25×–4× chained atempo. Output MP3. Pitch follows tempo. Max 100 MB.
Download or copy the result from Audio Speed. If it is the wrong job, open Video Speed instead.

When not to use Audio Speed

Skip Audio Speed when a neighbor tool matches better — start with Video Speed or Trim Audio — or when the description already warns the job will fail. In the tool’s own words: Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine.

Questions about Audio Speed

What does Audio Speed do that other Audio pages on this site do not?: Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine. Short version: Change playback rate with chained atempo.
Does Audio Speed upload my file or text to Tool-You servers?: No. Audio Speed runs in this browser tab. Files stay on the device. Limit note: Audio only. 0.25×–4× chained atempo. Output MP3. Pitch follows tempo. Max 100 MB.
Should I use Video Speed instead of Audio Speed?: Use Audio Speed when you need Change playback rate with chained atempo. Use Video Speed when you need Speed up or slow down a video. They share a category (Audio) but not the same job.
What are the limits of Audio Speed?: Audio only. 0.25×–4× chained atempo. Output MP3. Pitch follows tempo. Max 100 MB. Also: Speeds or slows audio with chained atempo 0.25×–4×, then MP3. Unlike Video Speed there is no picture timeline. Unlike Trim Audio this keeps the whole clip. Pitch follows tempo. First run downloads the engine.