# Audio Speed Changer Change audio playback speed while maintaining original pitch using time-stretching algorithms > Canonical page: https://elysiatools.com/en/tools/audio-speed-changer - **Category:** Media - **Keywords:** audio, speed, tempo, pitch, time-stretch, faster, slower, rate ## Overview The Audio Speed Changer allows you to adjust the playback tempo of your audio files while preserving the original pitch. Using advanced time-stretching algorithms, this tool enables you to speed up or slow down recordings between 0.25x and 4.0x without creating the 'chipmunk' or 'slow-motion' voice effects typically associated with rate changes. ## Inputs - **Audio File** (file): Select an audio file... - **Playback Speed (0.25x - 4.0x)** (range): 0.25x = quarter speed, 1.0x = normal speed, 2.0x = double speed, 4.0x = quadruple speed. Pitch remains unchanged. - **Output Format** (select) - **Audio Quality** (select) ## When to use - Accelerating long lectures or podcasts to save time while maintaining clarity. - Slowing down complex musical passages or language lessons for easier transcription and practice. - Adjusting the duration of audio clips to fit specific time constraints in video or media projects. ## How it works - Upload your audio file in a supported format like MP3, WAV, or FLAC. - Use the slider to select your desired playback speed, ranging from 0.25x to 4.0x. - Choose your preferred output format and quality setting to balance processing time and fidelity. - Process the file to download your modified audio track with the pitch perfectly preserved. ## Use cases - Transcribing interviews by slowing down speech to a comfortable typing pace. - Optimizing educational content by speeding up playback for efficient review. - Preparing audio assets for media projects that require precise timing adjustments. ## Frequently asked questions ### Does changing the speed affect the pitch? No, the tool uses time-stretching algorithms to ensure the pitch remains exactly the same as the original recording. ### What is the maximum speed increase allowed? You can increase the playback speed up to 4.0x or decrease it down to 0.25x. ### Which audio file formats are supported? The tool supports common formats including MP3, WAV, FLAC, AAC, OGG, and M4A. ### How does the 'Quality' setting affect my file? High quality provides the best audio fidelity but requires more processing time, while low quality is faster but may introduce minor artifacts. ### Is there a file size limit? Yes, the tool supports individual file uploads up to 10MB. ## Related tools - [FFmpeg Audio Noise Reduction](https://elysiatools.com/en/tools/ffmpeg-audio-noise-reduction): Professional audio noise reduction using FFmpeg advanced filters (highpass, afftdn, loudnorm) for optimal audio cleaning - [Audio Channel Resample](https://elysiatools.com/en/tools/audio-channel-resample): Change the number of channels (mono/stereo) while keeping the same format - [Audio Mixer](https://elysiatools.com/en/tools/audio-mixer): Mix two audio files together with customizable timing control - [Audio Noise Reducer](https://elysiatools.com/en/tools/audio-noise-reducer): Remove background noise from audio files using various noise reduction algorithms - [Audio Resample](https://elysiatools.com/en/tools/audio-resample): Change the sample rate of an audio file (e.g., 44.1kHz to 22.05kHz) - [Audio Codec Swap](https://elysiatools.com/en/tools/audio-codec-swap): Change the codec of an audio file within a chosen output format - [Batch Audio Converter](https://elysiatools.com/en/tools/audio-batch-converter): Convert multiple audio files between different formats like MP3, WAV, FLAC, AAC, OGG, Opus with quality settings and batch processing - [Audio Format Converter](https://elysiatools.com/en/tools/audio-converter): Convert audio files between different formats like MP3, WAV, FLAC, AAC, OGG with quality settings and volume adjustment ## Samples - [Copyright-Free M4A Audio Samples](https://elysiatools.com/en/samples/m4a-samples): Apple iTunes compatible M4A audio samples with AAC encoding, optimized for quality and file size balance - [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 ## Related content - [Audio Pitch, Tempo, Looping, and Reverse Playback Tools](https://elysiatools.com/en/hubs/audio-pitch-tempo-remix-workflows): Compare pitch shifting, time stretching, speed changes, beat matching, looping, reverse playback, and glitch-style timing tools in one audio remix workflow hub. - [Audio Encoding and Format Conversion Tools](https://elysiatools.com/en/hubs/audio-convert): Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows. - [Audio Editing and Cleanup Tools](https://elysiatools.com/en/hubs/audio-utility): Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows. - [Audio Preview, Tone, and Effect Generator Tools](https://elysiatools.com/en/hubs/audio-generate): Compare audio preview generation, silence creation, ringtone building, fingerprinting, loudness reports, and effect-style audio generators in one hub.