Free tools for your next audio edit
Convert a supported MP3 or WAV to a 44.1 kHz or 48 kHz PCM WAV. Choose the rate your project requires, preview the converted recording, and download it. Mono stays mono and stereo stays stereo; your audio remains in this browser.
No recording is uploaded. Conversion keeps the decoded channel count and exports the full decoded duration, with no normalization or trimming. WAV exports must also fit within 50 MiB. Keep the original; its metadata and bit depth are not preserved.
Convert for the project you are making
Keep an untouched source. Select the sample rate specified by your editor, collaborator, or delivery instructions.
Use a mono or stereo recording up to 50 MiB and five minutes. The original player lets you check the selected file. For a WAV, the WAV inspector can report the rate and encoding stored in its header.
Choose 44,100 Hz or 48,000 Hz, then prepare the WAV. The browser checks duration and decodes the original file directly at your chosen rate. The tool does not first convert everything to 48 kHz and then convert it again.
Compare the converted recording with the original. Download the same WAV used by the preview, check its header, and listen after importing it into the intended project. Changing the chosen rate clears the previous result.
Sample conversion, rather than a new label
Sample rate describes sample frames per second. A frame holds one sample from each channel. A one-second mono recording at 44,100 Hz therefore has 44,100 frames. Resampling it to 48,000 Hz creates approximately 48,000 frames for the same playback time; stereo has two samples in each frame.
Changing only the rate field while retaining the old frames is a different operation. The player would run those frames at a new speed, changing the recording’s duration and pitch. This converter decodes and resamples complete file data at the selected output rate, following the browser behavior described in MDN’s decodeAudioData reference.
duration seconds = sample frames ÷ sample rateThe output preserves the decoded channel count. It does not average stereo into mono, split a channel, apply gain, or remove audio. If you need one existing side rather than a new rate, use the channel splitter. If you need a level adjustment, compare the sample peak normalizer and its separate limits.
A one-second mono example
| Operation | Frames | Declared rate | Playback duration |
|---|---|---|---|
| Original recording | 44,100 | 44,100 Hz | 1 second |
| Resample to 48 kHz | 48,000 | 48,000 Hz | 1 second |
| Relabel the same frames as 48 kHz | 44,100 | 48,000 Hz | 0.91875 seconds |
Choose a useful delivery format
A one-channel input remains one channel, and a two-channel input remains two. The tool does not trim silence, add fades, normalize volume, or select a sound source. Browser decoding and rounding mean the result is not a promise of sample-for-sample identity with the original.
Every result is a 16-bit PCM WAV at 44.1 or 48 kHz. Original tags, artwork, and other metadata are not copied. For 24-bit or floating-point delivery, use an editor with those settings. Decoded samples above integer PCM full scale are clipped; adjust an excessive source level before making that delivery.
Uncompressed WAV may be larger than the original MP3. Input and output must each fit within 50 MiB. A five-minute stereo WAV may exceed the output limit even when a compressed input fits; use the size calculator to plan an excerpt or the rate required by your project.
Conversion is for compatibility
Choose a rate because the destination asks for it, rather than because the larger number looks better. Converting a lossy recording to WAV does not reverse its earlier compression. Resampling a low-rate source cannot restore missing high-frequency information.
Keep the original and make each conversion from that file. The converter reopens the selected source for each output, so choosing a different rate does not reuse a previously converted WAV. Avoid importing, exporting, and reconverting a succession of copies when a single compatible delivery is enough.
You do not need to resample a supported recording just to upload it for Saturalabs’ separate AI isolation service. If a clip is too long for this local tool, create a manageable excerpt in your editor first. The free trimmer can shorten supported recordings within its own limits, but it makes its own 48 kHz WAV export.
Read the original and converted headers, distinguish format information from sound quality, and compare stored fields with actual file size.
A few useful answers
Choose a supported mono or stereo MP3/WAV, select 48,000 Hz, and prepare the WAV. The browser decodes and resamples the original at that rate, then exports 16-bit PCM WAV. Preview it, download it, and use the WAV inspector to confirm its header. Select 44,100 Hz for the reverse conversion.
Conversion, preview, and WAV download are free, with no account or credits. The selected file is read and converted in this browser. It is not uploaded by this tool. Download the result before leaving or reloading; the session does not save your recording for later.
This tool resamples the audio instead of relabeling its header. The sample count changes to retain normal playback timing at the chosen rate. Browser codec decoding and sample rounding can affect exact correspondence with the original, so check alignment when returning audio to a video or multitrack timeline.
A higher output rate cannot restore details missing from the source. Use conversion for project or delivery compatibility. It does not reduce noise, normalize levels, repair clipping, or separate voices from instruments. Keep the best original recording rather than repeatedly converting a converted copy.
Open a mono or stereo MP3/WAV up to 50 MiB and five minutes. Browser codec support varies; standard PCM WAV is a useful fallback. Outputs are 44.1 or 48 kHz, 16-bit PCM WAV and must also fit within 50 MiB. Longer, multichannel, 24-bit, floating-point, or other-rate deliveries need an editor with those export options.
No. MP3 can be an input, but the converter does not encode MP3. A PCM WAV can be much larger than a compressed MP3 of the same duration. The result shows its actual byte size, rate, channels, and sample frames. Original tags and artwork are not copied.
You do not need this conversion simply to upload a supported MP3 or WAV to the separate AI service. Use it when your editing project or delivery specification requires 44.1 or 48 kHz. The AI isolation workflow has its own account and download credits; this free converter does not start an AI job.
After preparing your audio