PureTools
Convert Audio to Any Format Directly in Your Browser
Convert any audio file to MP3, AAC, OGG, FLAC or WAV, directly in your browser. Control output bitrate and sample rate for each format. No upload, no watermark, 100% private.
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or · up to 200 MB
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How to use the Audio Converter
This tool converts any audio file to a different format, entirely in your browser with no server involved and no watermark on the output. Choose between five output formats: MP3, AAC, OGG, FLAC and WAV. For lossy formats, select a bitrate between 64 and 320 kbps and a sample rate to fine-tune the output quality. FLAC and WAV output is lossless, no bitrate setting is needed. The tool works on desktop and mobile and continues working offline after the first visit.
- Select your audio file, drag and drop an audio file onto the drop zone, or click Browse. MP3, M4A, WAV, OGG, FLAC and AAC files are all supported, up to 200 MB. The file name and size appear in the file card once loaded.
- Choose the output format, click one of the five format buttons, MP3, AAC, OGG, FLAC or WAV. The file extension shown in the filename field updates automatically to match the selected format.
- Adjust bitrate and sample rate, for MP3, AAC and OGG output, choose a bitrate from 64 to 320 kbps to control audio quality and file size. For all formats, choose a sample rate, 44100 Hz for standard use or 48000 Hz for professional audio. Bitrate options are not shown for FLAC and WAV because those formats are lossless and uncompressed.
- Set the output filename, the filename field is pre-filled with the source file's name. The file extension is added automatically based on the format you selected. Change the name as needed before converting.
- Click Convert and download, the result card shows the input and output file sizes and the quality settings used. Click Download to save the converted file. No watermark is added to any output.
Lossy vs lossless, when to use each format
MP3, AAC and OGG are lossy formats, they discard some audio data to reduce the file size. The amount discarded is controlled by the bitrate: higher bitrates preserve more detail. These formats are the right choice for distribution and sharing where file size matters. FLAC and WAV are lossless formats, FLAC compresses without discarding any data, while WAV stores audio raw with no compression at all. Lossless formats are used for archiving, professional production and any situation where the audio will be edited or re-encoded again later. Converting a lossless file like WAV or FLAC to a lossy format like MP3 is a clean single-step process. Converting an already-lossy file to another lossy format at a lower bitrate adds further quality loss, so always start from the highest-quality source available.
Choosing between MP3 and AAC for sharing
Both MP3 and AAC are lossy formats, but AAC generally delivers better audio quality at the same bitrate. At 128 kbps, most listeners find AAC noticeably clearer than MP3, particularly at high frequencies. AAC is the standard for Apple devices, YouTube uploads and modern streaming services. If you are sharing files with people who may use older hardware or software, MP3 is the safer choice because its support is universal, every device and platform that plays audio understands MP3. If compatibility is not a concern, AAC at 128 kbps is preferable to MP3 at 128 kbps for music. If you specifically need to reduce an MP3's file size after conversion to fit a platform limit, the MP3 Compressor calculates the ideal bitrate automatically for WhatsApp, Discord or email.
Frequently asked questions
Is my audio file uploaded to a server?
No. The entire conversion runs inside your browser without any server involvement. Your audio file is loaded into your browser's memory, processed using a local audio engine, and the converted file is created directly in your browser. PureTools has no server infrastructure to receive files. You can disconnect from the internet after the page loads and the tool continues to work. Your file exists only in your browser's memory and is discarded when you close the tab. Your data is never used to train AI models or improve machine learning systems.
What audio formats can I convert to?
The tool converts any audio file to five output formats. MP3 is the most widely supported format across all devices, messaging apps and media players. AAC (saved as M4A) offers better quality than MP3 at the same bitrate and is the standard for Apple devices and YouTube. OGG is an open-source format well suited to web apps and games. FLAC is a lossless format, no audio data is discarded during conversion. WAV is an uncompressed format used in professional audio production. No watermark is added to any output.
What audio formats are accepted as input?
The tool accepts MP3, M4A (AAC), WAV, OGG, FLAC and AAC files as input, covering the most common formats from smartphones, recording apps, music downloads and video editing software. The maximum input size is 200 MB per file. If your source is a video file and you want to convert its audio track, use the Video to MP3 tool first to extract the audio, then convert it here to your target format. No watermark is added to any output.
What bitrate should I choose?
Bitrate controls how much audio data is preserved per second of playback. 64–96 kbps is sufficient for voice recordings, podcasts and spoken-word content where the full frequency range of music is not needed. 128 kbps is the standard balance between quality and file size for general use. 192 kbps preserves musical fidelity, most listeners cannot distinguish it from a lossless source on typical headphones or speakers. 320 kbps is the highest and preserves the most detail, but produces the largest files. For archival, use FLAC instead of a high-bitrate lossy format.
What sample rate should I use?
44100 Hz (44.1 kHz) is the CD standard and the right choice for music, podcasts and most audio content, every device plays it correctly. 48000 Hz (48 kHz) is the standard for professional video and broadcast production; choose it when the audio will be used in a video editing program. 22050 Hz halves the file size of uncompressed formats like WAV and FLAC at the cost of slightly reduced high-frequency detail, suitable for voice recordings and archival where storage space is limited.
Why are bitrate options not shown for FLAC and WAV?
FLAC (Free Lossless Audio Codec) and WAV (Waveform Audio File Format) are not controlled by bitrate. FLAC uses a lossless algorithm that preserves every bit of audio from the original source, the file size depends on the audio content, not a bitrate setting. WAV stores raw, uncompressed audio with no data removed at all. For these formats, only the sample rate is adjustable. Choosing FLAC or WAV as output will typically produce a larger file than lossy formats like MP3 or AAC because no audio data is discarded.
Can I convert an audio file to the same format to change the bitrate?
Yes. You can convert an MP3 to MP3, an OGG to OGG, or an AAC to AAC with a different bitrate, this is called re-encoding. Keep in mind that reducing the bitrate of an already-compressed file adds further quality loss, since the audio has already been through one lossy compression step. If your source is a lossless file like WAV or FLAC, converting to MP3 at 192 kbps is a clean single-step process. Starting from an already-compressed MP3 and encoding again to MP3 at a lower bitrate will add more artifacts. For quality-sensitive work, always start from the highest-quality source available.
Is there a file size limit?
Yes. The maximum input file size is 200 MB per file. This limit protects your device's memory, the file is loaded entirely into your browser's memory for processing. Most audio files are well within this limit: a 60-minute podcast at 128 kbps is approximately 55 MB, and a 10-minute WAV recording at 44100 Hz is around 100 MB. For very large recordings, consider trimming to the section you need before converting, or splitting the file into smaller segments first. No watermark is added to any output regardless of file size.
Does the tool work offline?
Yes, after your first visit. PureTools saves the audio processing engine (~30 MB) locally on your device on first use. All subsequent visits, including offline, load from your local cache and the conversion runs entirely without a network connection. If you plan to work offline, visit the page once with an internet connection before going offline so the engine is cached on your device. For the most reliable offline use, open the merger once while online, then keep the browser cache intact before using it without a connection.
Is my data erased when I close the tab?
Yes, completely. Your audio file is held only in your browser's memory while the tab is open. Your preferences, selected output format, bitrate and sample rate, are saved for the current session only and cleared automatically when you close the tab. No file content, no audio data and no personal information is written to permanent storage or transmitted to any server. Closing the tab erases everything instantly.