Free Audio Trimmer

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.

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.

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.

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.

Choose MP3 when you want a small, widely compatible file for sharing, ringtones, or the web; you can pick a bitrate from 128 kbps for the smallest size up to 320 kbps for the best MP3 quality. Choose WAV when you want a lossless copy of the trimmed audio with no re-compression, for example when you plan to edit it further in another program. MP3 re-encodes the slice and is lossy, while WAV is written directly from the raw samples, so WAV files are larger but keep full fidelity.

Very precise. Each end of the selection has both a slider and a numeric time field that shows minutes, seconds, and milliseconds (mm:ss.ms). You can drag the sliders for a quick selection or type an exact timestamp down to the millisecond for a frame-accurate cut. The tool converts your times into exact sample offsets before slicing, so the export matches what you set.

There is no artificial cap imposed by a server, because there is no server involved. The only practical limit is your device memory, since the audio is decoded into RAM to be trimmed. On a typical laptop you can comfortably trim long songs and lengthy recordings; only extremely large files on a low-memory phone might run into the browser memory limit. Unlike upload-based cutters, nothing here counts against a paid quota.

No watermark, ever. Many free online cutters add an audible tag or a visual watermark on their free tier, but this tool never does. When you export WAV, the trimmed audio is a lossless copy of the original samples with no quality loss at all. When you export MP3, the slice is re-encoded at the bitrate you choose, which is a normal lossy step; picking a higher bitrate such as 256 or 320 kbps keeps the quality high, and WAV avoids re-compression entirely.

Yes. Once the page has loaded, trimming runs entirely on your device, so it keeps working even if you go offline. It also works in modern mobile browsers, though phones have less memory than a laptop, so very long files are better handled on a desktop. For everyday clips and ringtones, mobile works fine.

No installation is needed. It is a pure web tool that runs in any modern browser with no extension, no desktop app, and no account. There is nothing to download except your own trimmed file at the end. Everything the tool needs, the Web Audio API and the lamejs MP3 encoder, loads with the page and runs locally.

Yes, it is a great ringtone maker. Upload a song, set the start and end sliders around the section you want, keep it to the length your phone allows, and export it as MP3. Because you can set the start and end points to the millisecond, you can line the clip up exactly on a beat or a lyric, then download the MP3 and transfer it to your phone.

It is built on standard, open web technology. The browser Web Audio API decodes your file into raw PCM samples and gives direct access to each channel, so trimming is a matter of copying the samples between your start and end offsets. WAV files are then written natively from those samples, and MP3 files are encoded with lamejs, a well-known pure-JavaScript MP3 encoder that runs in the browser. No server, no cloud service, and no proprietary black box is involved.