# Audio Time Stretch

Stretch or compress audio to a target duration

> Canonical page: https://elysiatools.com/en/tools/audio-time-stretch

- **Category:** Media

- **Keywords:** audio, time stretch, tempo, duration

## Overview

Computes an atempo factor from the target length to stretch/compress while keeping pitch stable (within 0.25x–4x).

## Inputs

- **Audio File** (file): Select an audio file
- **Target Duration (seconds)** (number): e.g. 90
- **Output Format** (select)

## When to use

- When you need to match audio duration to video or other media timelines.
- For creating slow-motion or fast-forward effects in audio recordings.
- To standardize the length of audio clips for consistency in projects.

## How it works

- Upload an audio file in a supported format (e.g., MP3, WAV).
- Specify the target duration in seconds (default is 90 seconds).
- Select the desired output format from options like MP3, AAC, or WAV.
- The tool computes the atempo factor and processes the audio, delivering a file with the new duration.

## Use cases

- Video editing: Sync audio tracks to match video clip durations.
- Music production: Adjust the tempo of samples or loops for creative effects.
- Podcasting: Compress or extend episodes to fit specific time slots.

## Frequently asked questions

### What audio formats are supported for input?

The tool accepts common audio formats such as MP3, WAV, AAC, and others via file upload.

### Does time stretching affect the audio pitch?

No, the tool preserves pitch stability by using an atempo factor within the 0.25x to 4x range.

### What is the allowed range for target duration?

Target duration can be set from 0.5 seconds to 7200 seconds (2 hours).

### Is there a file size limit for uploads?

Yes, audio files must be under 200 MB.

### Can I choose the output audio format?

Yes, you can select from formats including MP3, AAC, M4A, OGG, Opus, FLAC, and WAV.

## Related tools

- [Audio Change Bitrate](https://elysiatools.com/en/tools/audio-change-bitrate): Re-encode audio to a new bitrate while keeping the same format
- [Audio Metadata Compress](https://elysiatools.com/en/tools/audio-metadata-compress): Compress or remove metadata and embedded artwork to reduce file size
- [WAV Compress](https://elysiatools.com/en/tools/wav-compress): Compress a WAV file by converting to MP3, AAC, OGG, or Opus
- [MP3 to Low Quality](https://elysiatools.com/en/tools/mp3-to-low-quality): Convert MP3 to a lower bitrate for smaller size
- [Audio Add Silence](https://elysiatools.com/en/tools/audio-add-silence): Add a specified duration of silence to the start or end of an audio file
- [Batch Audio Normalize](https://elysiatools.com/en/tools/audio-batch-normalize): Normalize multiple audio files to a target peak level with consistent volume across the batch
- [Audio Beat Matcher](https://elysiatools.com/en/tools/audio-beat-matcher): Adjust tempo to match a target BPM
- [Audio Caption Timing Shifter](https://elysiatools.com/en/tools/audio-caption-timing-shifter): Shift SRT or WebVTT captions to a likely speech onset or by a manual offset.

## Samples

- [Copyright-Free FLAC Audio Samples](https://elysiatools.com/en/samples/flac-samples): Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free MP3 Audio Samples](https://elysiatools.com/en/samples/mp3-samples): Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
- [Copyright-Free WAV Audio Samples](https://elysiatools.com/en/samples/wav-samples): Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
- [Copyright-Free Raw PCM Audio Samples](https://elysiatools.com/en/samples/pcm-samples): Raw PCM s16le audio samples featuring nature ambience and relaxing music for waveform, playback, and conversion workflows