100% Private
No Signup
Free Forever
One of 64 free AI tools by Mahmoud Zalt.
Free Audio Trimmer
Cut and trim MP3 or WAV audio, fully private|4.7 (612)
A free, private audio trimmer and cutter that lets you slice a section out of any audio file without uploading a single byte. It is built on the browser Web Audio API, which decodes your file and gives direct access to the raw audio samples, so trimming is just a matter of copying the samples between your chosen start and end points. Drop in an MP3, WAV, M4A, OGG, or FLAC file, drag two sliders or type exact timestamps down to the millisecond, preview the original, then export the selected slice as an MP3 (with a bitrate of your choice) or a lossless WAV. MP3 encoding is handled by lamejs, a pure-JavaScript MP3 encoder that runs entirely in your browser, and WAV is written natively from the raw PCM samples. Because every step happens on your own device, there is no upload, no server processing, no watermark, no length limit, and no file-size cap. It is a fast, no-nonsense replacement for online audio cutters that make you wait for uploads and then stamp their brand on your file.
Free and provided as is, without warranty. Use at your own risk. Terms
Cut and trim audio without uploading anything
Most online audio cutters ask you to upload your file to a server, trim it there, and download the result, which means your audio leaves your control, you wait through an upload and a download, and free tiers frequently stamp a watermark or an audible tag onto the output or cap how long a clip you are allowed to cut. This free audio trimmer works the other way around: everything happens inside your browser tab. Your file is decoded on your own device, the selected section is sliced from the raw samples, and the result is encoded locally, so the audio never touches a server and there is no upload, no watermark, and no length or file-size limit.
That makes it a strong fit for confidential recordings, unreleased music, client work, and any audio you would rather not hand to a third-party website. You still get a clean MP3 or a lossless WAV you can use anywhere, and you can confirm nothing is uploaded by watching the Network tab in your browser DevTools while it works. Because there is no server round-trip, the cut is effectively instant for typical files.
Powered by the Web Audio API and lamejs, running in your browser
This tool is built on the browser Web Audio API, the same standard engine your browser uses to play sound. When you upload a file, it is decoded with an AudioContext into an AudioBuffer, which exposes the raw PCM samples for each channel along with the sample rate and channel count. Trimming is then simply a matter of copying the samples between the start and end offsets you choose, which is why it is fast and lossless up to the point of export.
For output, WAV files are written natively from those raw samples, so a WAV export is a bit-for-bit copy of the trimmed region with no re-compression. MP3 files are encoded with lamejs, a well-known pure-JavaScript MP3 encoder that runs entirely in the browser, letting you pick a bitrate from 128 up to 320 kbps to balance file size against quality. No backend service, no cloud API, and no proprietary component is involved, which is what keeps the whole process private and free.
MP3 vs WAV, and tips for a clean cut
Pick MP3 when you want a small, portable, widely compatible file, for example a ringtone, a shareable clip, or audio for the web; a bitrate of 192 kbps is a good default, and 256 or 320 kbps keeps quality high when the source is already high quality. Pick WAV when you want a lossless copy of the trimmed audio with no re-encoding, which is the right choice if you plan to edit the clip further in another program or need maximum fidelity. The trade-off is size: WAV files are considerably larger than MP3s of the same length.
For the cleanest cut, use the numeric mm:ss.ms fields rather than only the sliders when you need precision, since they let you set the start and end down to the millisecond so you can land exactly on a beat, a word, or a silence. Preview the original with the built-in player to find your points, trim, then listen to the result before downloading. If a file will not decode, convert it to MP3 or WAV first and it will work. The exported file is named after your original with a -trimmed suffix, so it is easy to tell apart from the source.
More Free Tools
more than 50 free AI tools.
Who this audio trimmer is built for
Podcast editors pull a single quotable clip out of a full episode to post on social media, musicians and producers grab a sample or a hook out of a longer recording to work with in a DAW, and everyday users cut a custom ringtone or notification sound out of a favorite song in under a minute.
It also gets used by anyone trimming dead air, a long intro, or a false start off a voice memo or interview before sharing it, and by people trimming confidential audio, an unreleased demo, an internal meeting recording, a client voiceover, that they specifically do not want passing through a third-party server on its way to becoming a shorter clip.
How this compares to online cutters and desktop editors
Free online audio cutters typically fund themselves with ads, a watermark or audible tag on exports, or a length cap that pushes you toward a paid tier, usually 5 to 15 dollars a month for unlimited or watermark-free clips. Full desktop editors like Adobe Audition or Audacity give you far more editing power but require installing software and a learning curve just to make a simple cut.
This tool sits between the two: no watermark, no ads, no length cap, and no install, because trimming a section out of a file does not need a full editing suite, it needs a fast, private way to set two points and export. For anything beyond a single cut, like layering tracks or applying effects, a dedicated editor is still the right tool.
Handling large files and unusual formats
Because the whole file is decoded into memory before trimming, a multi-hour recording or a very large WAV can be slow on an older phone or a laptop with limited RAM. If a large file feels sluggish, try it on a desktop browser, or convert it to a compressed format like MP3 first to shrink the amount of data being decoded.
If a file refuses to load at all, it is usually a container or codec your browser does not recognize. DRM-protected audio falls into this category too, since browsers cannot legally decode protected content. Re-exporting the source as MP3, WAV, or M4A from whatever app created it resolves nearly every decode failure before you bring it here to trim.
How It Works
Upload an audio file: it is decoded in your browser with the Web Audio API and nothing is sent to a server.
Set the start and end points with the two sliders or by typing exact mm:ss.ms timestamps, and preview the original while you choose.
Pick MP3 (with a bitrate) or WAV, click Trim and export, then preview the result and download the trimmed slice.
Need expert help with AI?
Looking for a specialist to help integrate, optimize, or consult on AI systems? Book a one-on-one technical consultation with an experienced AI consultant to get tailored advice.
Key Features
Privacy & Trust
Use Cases
Limitations
- Decoding relies on your browser AudioContext, so very unusual containers or codecs may not decode; exporting the source to MP3, WAV, M4A, OGG, or FLAC first fixes most cases
- The entire file is decoded into memory, so extremely long files on a low-memory device can be limited by available RAM rather than by any server rule
- MP3 export re-encodes the slice with lamejs, which is a lossy step; choose a higher bitrate or export WAV when you need maximum fidelity
- This tool trims and cuts a single continuous section; it does not mix, fade, or join multiple clips together
Frequently Asked Questions
Is this audio trimmer really free?
Yes, it is completely free with no signup, no account, and no usage limits. All of the work happens in your own browser, so there are no server costs to pass on to you. You can trim as many audio files as you want, as often as you want, without a credit card, an API key, or a rate limit. There is also no premium tier that unlocks features, since every option is available to everyone from the start.
Is my audio uploaded to a server?
No. The whole process, decoding the file, slicing the samples, and encoding the result, happens locally in your browser using the Web Audio API and lamejs. Your audio is never uploaded, logged, or stored anywhere, which makes this safe for confidential recordings and unreleased tracks. You can confirm this by opening the Network tab in your browser DevTools while you trim a file: you will not see any request carrying your audio to a server.
How is this different from online audio cutters that make me upload?
Most online audio cutters upload your file to their server, cut it there, and send it back, which means your audio leaves your control, you wait for the upload and download, and free tiers often add a watermark, an audible tag, ads, or a length limit. This tool works the opposite way: nothing is uploaded, there is no watermark and no ads on your file, there is no length or size cap imposed by a server, and the cut happens instantly on your own device. It is faster for anything but the tiniest file, and it is private by design.
What audio formats can I trim?
You can upload MP3, WAV, M4A, OGG, FLAC, and other formats your browser is able to decode through the Web Audio API. Decoding uses the same engine your browser uses to play audio, so common formats work out of the box. If a particular file will not decode, converting or exporting it to MP3 or WAV first will almost always solve it, and then you can trim it here.
Q&A SESSION
Got a quick technical question?
Skip the back-and-forth. Get a direct answer from an experienced engineer.