Trim WMA — Free Online Tool
Trim a WMA file to an exact time range directly in your browser, preserving the original wmav2 audio stream without re-encoding. Useful for cutting ringtones, clips, or segments from Windows Media Audio files while maintaining the original bitrate and quality.
to
FFmpeg Command
Copy this command to run the same conversion locally with FFmpeg on your desktop. Download FFmpeg
Drop your WMA file here
or click to browse
Free — no uploads, no signups. Your files never leave your browser.
Settings
Note: Browser-based encoding uses approximate quality targets. For precise CRF compression, copy the FFmpeg command above and run it on your desktop.
Estimated output:
Conversion Complete!
DownloadHow It Works
Because the input and output are both WMA files using the same wmav2 (or wmav1) codec, FFmpeg can trim the audio using stream copy mode (-c copy), which means the audio data is cut and remuxed into a new WMA container without any decoding or re-encoding. This is lossless in the sense that no additional quality degradation occurs — the audio samples that remain in the trimmed segment are byte-for-byte identical to the original. The trade-off is that WMA's frame-based structure means the actual cut point will snap to the nearest audio frame boundary, so the trim may be accurate to within a few milliseconds rather than sample-exact. No quality parameters are applied since the stream is copied directly.
What Each Flag Does
| Flag | What it does |
|---|---|
ffmpeg
|
Invokes the FFmpeg binary. In the browser-based tool, this runs via FFmpeg.wasm (WebAssembly) entirely client-side with no server upload. On your desktop, this calls your locally installed FFmpeg executable. |
-i input.wma
|
Specifies the input WMA file. FFmpeg reads the ASF container and identifies the enclosed wmav2 (or wmav1) audio stream for processing. |
-ss 00:00:00
|
Sets the start time of the trim at 0 seconds (the beginning of the file). Change this timestamp in HH:MM:SS format to start the clip at any point within the WMA file, such as -ss 00:01:30 to begin at the 1-minute-30-second mark. |
-to 00:00:10
|
Sets the end time of the trim at 10 seconds from the start of the file (not from the -ss point). Adjust this to any desired endpoint, such as -to 00:03:45 to end the output clip at 3 minutes and 45 seconds into the original file. |
-c copy
|
Copies the WMA audio stream directly into the output container without decoding or re-encoding. Since both input and output are WMA using the same wmav2 codec, this avoids any additional quality loss from a second lossy compression pass and makes the operation nearly instantaneous regardless of file length. |
output.wma
|
The filename of the trimmed WMA output file. FFmpeg uses the .wma extension to write the result into a new ASF container holding the copied audio segment. |
Common Use Cases
- Cut a specific verse or chorus from a WMA music track to use as a Windows phone or notification sound
- Extract a short clip from a WMA audiobook chapter to share a specific passage without distributing the full file
- Remove silence or dead air from the beginning or end of a WMA recording made with Windows Voice Recorder or legacy Windows Media Player
- Isolate a specific segment from a WMA internet radio stream recording for archival or reference purposes
- Trim a WMA soundtrack file exported from Windows Movie Maker to fit a specific video segment length
- Create a short WMA preview clip from a longer audio file for use in a Windows-native media application that specifically requires the WMA format
Frequently Asked Questions
No. Because the input and output are both WMA, FFmpeg uses stream copy mode (-c copy), which skips decoding and re-encoding entirely. The audio data in the retained segment is copied directly into the new WMA container. Since WMA is a lossy format, the original compression artifacts from the initial encoding are preserved, but no new quality loss is introduced by the trim operation itself.
WMA encodes audio in discrete frames, so with -c copy FFmpeg snaps the cut point to the nearest frame boundary rather than an exact sample. In practice this means the start and end of your trimmed file may differ from your specified timestamps by a few milliseconds. If sample-exact precision is critical, you would need to decode and re-encode the audio, which would introduce an additional generation of lossy compression loss.
WMA supports metadata tags through the ASF (Advanced Systems Format) container it is built on. When trimming with -c copy, FFmpeg typically carries over the existing metadata from the source file into the output. However, you may want to review tags afterward, as fields like track duration will be updated to reflect the trimmed length, and some players display the embedded metadata rather than re-reading file duration dynamically.
No. DRM-protected WMA files use encryption tied to a license that prevents the audio stream from being read or copied without authorization. FFmpeg cannot bypass WMA DRM, and neither can the browser-based tool. You will need a DRM-free version of the file to perform any trimming operation.
Because this command uses -c copy, no bitrate parameter is applied — the original bitrate of the source WMA file is preserved as-is. If you want to trim and simultaneously change the bitrate (for example, to 192k), you would replace -c copy with -c:a wmav2 -b:a 192k in the command. Valid bitrate options for WMA include 64k, 96k, 128k, 160k, 192k, 256k, and 320k, though changing the bitrate will re-encode the audio and alter quality.
The single command shown targets one input file, but you can adapt it for batch processing in a shell script. On Windows, a simple for loop such as 'for %f in (*.wma) do ffmpeg -i "%f" -ss 00:00:00 -to 00:00:10 -c copy "trimmed_%f"' will apply the same trim to every WMA file in a directory. On macOS or Linux, replace the for loop syntax with the bash equivalent. This is especially practical for files larger than 1GB that cannot be processed in the browser.
Technical Notes
WMA files are encapsulated in the ASF (Advanced Systems Format) container, which supports streaming, DRM, and metadata tags but notably lacks support for chapters, subtitles, or multiple audio tracks. The two available WMA audio codecs are wmav2 (the default and more common version, used in WMA 8 and later) and wmav1 (an older variant with slightly lower compression efficiency). When trimming with stream copy, the codec version in the output matches whatever is in the source file — no codec upgrade or downgrade occurs. Because WMA is a lossy format, all files carry compression artifacts from their original encoding session; repeated trim-and-save cycles using stream copy do not stack additional artifacts since no re-encoding occurs. One known limitation of the ASF container is that seeking can be slightly less precise than formats like MP4 or MP3 with Xing headers, which can occasionally cause minor timestamp drift when trimming near keyframe boundaries. The output file will not contain chapter markers or subtitle streams even if somehow present in an unusual source, as the WMA format specification does not support those features.