Step 1 / source
Add the source media
Source intake
Drop one media file here
Choose the audio file containing the section you want to keep.
MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, or WMA1 file / 50 MB
Checking publication status before file selection...
TEMPORARY MEDIA WORKSPACE / AUDIO TRIMMER
Audio Trimmer
Keep one continuous section of an audio file by entering start and end times, then download the clip as an MP3.
Request-scoped temporary processingAdd one supported file up to 50 MB. Long or unusually large-frame media may be rejected before processing.No account required
Local API readinessMedia service ready
One bounded job runs per API worker by default.The processor required by this tool is available, and this worker can accept a temporary job.
1 file / 50 MB
Temporary server workspace
The selected bytes are sent only to the Nirmion media API for this request. Processing uses a private temporary workspace rather than permanent catalogue storage.
Request-scoped cleanup
Server-side source and result files are removed when the response stream closes. Re-downloads use the result Blob retained only in this browser tab.
Original stays unchanged
Nirmion writes a separately named result containing nirmion_tools and never overwrites the selected source file.
Know the product contract
What goes in, what changes, what comes back
Every media page documents the accepted source, the selected FFmpeg transformation, the output container, and the limits that can affect the job.
Prepare the source
Note the precise start and end while listening to the source, including enough room around speech or music transitions.
Apply one operation
FFmpeg decodes only the requested timeline interval and encodes that continuous section into a new MP3.
Receive a separate file
Listen to the first and last seconds, confirm duration, and check that words or notes are not clipped.
Plain-language method
How time-based audio trimming works
The result is encoded as MP3, so lossless sources receive a lossy encode. Accurate cuts can still expose abrupt starts or endings without fades.
- 01Choose valid source media
Note the precise start and end while listening to the source, including enough room around speech or music transitions.
- 02Review the operation settings
Use decimal seconds for finer placement. The end must be later than the start and within the audio duration.
- 03Inspect and download the result
Listen to the first and last seconds, confirm duration, and check that words or notes are not clipped.
Useful when
Practical jobs this tool handles
- Remove silence around a voice memo.
- Keep one quote from a longer recording.
- Create a short audio sample for review.
Before processing
Check the source and output choices first
- Measure from the actual source beginning.
- Keep the end later than the start.
- Leave a natural margin around speech and music.
- Listen for abrupt boundaries after download.
Container and codec
Understand the output format
The output is MP3. This tool does not preserve a WAV, FLAC, or multichannel source container as-is.
Know the boundary
This is a hard cut without fades
The tool keeps one continuous interval and does not add fade-in, fade-out, crossfade, or silence padding. Cuts through a waveform can sound abrupt.
Quick answers
Questions before you process media
These answers describe the actual upload, FFmpeg processing, download, and temporary-retention contract.
Can the end time be blank?
Yes. The result then continues from the start time to the source end.
Can I remove several sections?
No. This tool keeps one continuous interval.
Does it add fades?
No. The boundaries are direct cuts without fade effects.