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Audio Pitch Changer
Shift the pitch of an MP3 or WAV file up or down in semitones without changing the speed.
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Audio Trimmer — Cut & Trim MP3 Free Online
Upload an MP3 or WAV, set start and end times, and download your clip instantly. No signup, no watermark, no re-encoding.
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or click to browse · max 20 MB · MP3, WAV
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Trimming an audio file means cutting it to a specific start and end point and saving the result as a shorter clip. The standard route involves opening a DAW, importing the file, locating the right timecodes, setting in/out points, and exporting with encoding settings. AT USE Audio Trimmer skips all of that. Upload an MP3 or WAV file, type a start time and end time in MM:SS format, and download the trimmed clip in seconds. The cut runs on the server using FFmpeg stream-copy mode, which means the audio is not re-encoded: the output segment is bit-identical to the corresponding portion of the original at the original bitrate, with no generation loss. File limit: 20 MB per file, 30 minutes maximum duration.
Why stream-copy matters
Most online audio editors re-encode the output using a codec configured for the editor's convenience, not yours. Re-encoding a 192 kbps MP3 at 128 kbps to save time is not "lossy" in an abstract sense — it is a permanent quality reduction on every frequency above 12 kHz. Stream-copy avoids this entirely: FFmpeg extracts the compressed audio frames within the requested time range and writes them to a new container without touching the codec data. For MP3 files, the output snaps to the nearest MPEG frame boundary (approximately 26ms at 44.1 kHz), which means the actual start point may land up to 26ms after your specified time. For speech, podcast, and music clips, this is inaudible. For WAV files (uncompressed PCM), the trim is sample-accurate.
File limits
The 20 MB limit covers most podcast clips and music segments at standard bitrates. A 30-minute MP3 at 192 kbps is approximately 44 MB, which exceeds the limit. For longer files, convert to a lower-bitrate MP3 first using the WAV to MP3 tool, then trim. The 30-minute duration limit applies regardless of file size. Both the uploaded file and the trimmed output are deleted from the server immediately after download. No account required, no watermark on output.
Common use cases
- Podcast clip for social media — A podcaster needs a 60-second highlight from a 90-minute episode. They upload the MP3, set Start to 22:15 and End to 23:15, and download a clean clip in 4 seconds — no DAW, no export settings, no format conversion.
- Remove dead air from a voice memo — A remote worker records a 12-minute voice note that starts with 40 seconds of background noise before the actual content. Setting Start to 0:40 trims the dead air without touching the rest of the recording.
- 30-second audio preview for sharing — A musician wants a preview clip of a track to embed in an email or share with a booking agent. They trim to the chorus at 1:10-1:42 and download the 32-second clip with no re-encoding of the original recording.
- Meeting segment for distribution — A manager receives a 45-minute recorded meeting and needs to share a specific decision discussion from minute 18 to 22. They upload the MP3, set Start to 18:00 and End to 22:00, and forward the 4-minute clip to the relevant team members.
- Transcription service submission — A legal researcher needs to submit a 3-minute excerpt from a recorded deposition to a transcription service with a strict per-file time limit. They trim the relevant portion and upload only that segment, staying within the service's requirements.
Frequently asked questions
Does trimming reduce audio quality?
No. The tool uses FFmpeg stream-copy mode, which extracts audio frames without re-encoding. The output is bit-identical to the corresponding segment of the original file at the original bitrate.
What audio formats are supported?
MP3 and WAV files up to 20 MB and 30 minutes. For M4A, OGG, FLAC, or AAC files, convert to MP3 first using the audio converter tools on this site, then trim.
Can I trim to an exact timestamp?
For MP3 files, the trim snaps to the nearest MPEG audio frame (approximately 26ms at 44.1 kHz). The actual start may land up to 26ms after your specified time — inaudible in practice for speech and music. WAV files trim to sample-accurate precision.
What happens to my file after processing?
Both the uploaded file and the trimmed output are automatically deleted from the server after your download completes. Nothing is stored between sessions.
My file is larger than 20 MB — what should I do?
Use the WAV to MP3 or MP3 audio tools to compress the file to a lower bitrate first. A 30-minute MP3 at 96 kbps is approximately 22 MB. Alternatively, trim a smaller sub-section using a desktop editor, then upload that portion.
Can I trim to a specific section in the middle of the file?
Yes. Set Start to the beginning of the section you want (for example, 5:30) and End to where you want the clip to finish (for example, 9:15). The output will contain only that 3 minute 45 second segment.
What else can I do with my audio file?
AT USE has a full audio suite — all free, no account required. Try the Audio Speed Changer (0.5× to 2× with pitch lock), Audio Pitch Changer (±12 semitones), Audio Reverser (sample-level time reversal), or Audio Volume Changer (dB or LUFS normalization). Audio Trimmer is what you're using now.
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