The Veecel Lab conversion engine supports an extremely wide range of formats. Input support: MP3, WAV, AAC, OGG, M4A, FLAC, WMA, ALAC, and other mainstream formats, even raw PCM/RAW data. Output support: MP3, WAV, AAC, OGG, M4A, FLAC, and 16/24/32-bit PCM data.

This is our core advantage. All audio processing is done locally in your browser. Your audio files are **never** uploaded to our servers, and the entire process runs completely offline, ensuring maximum protection for your privacy and copyright security.

Since conversion simulates processing inside the browser, the speed is limited by your device's processor performance. Large files, high sample rate conversions, or using complex encoders (like high-compression FLAC or AAC in VBR mode) will consume more computing resources. It is recommended to keep the page active and not switch to background tabs when converting large files.

CBR (Constant Bitrate) maintains a consistent data rate throughout the audio, suitable for scenarios with strict file size expectations and excellent compatibility. VBR (Variable Bitrate) dynamically adjusts the rate based on the complexity of the audio content (e.g., lower rate for silence, higher rate for complex symphonies), providing significantly better sound quality than CBR for the same average file size.

PCM files do not contain header information (sample rate, channels, etc.), so they cannot be identified automatically. When you import a .pcm or .raw file, a configuration box will appear. You need to know the exact parameters of the source file (e.g., 16000Hz, Mono, s16le). After setting them correctly, the engine can restore it to audible audio and perform the conversion.

When Loudness Normalization is enabled, the engine analyzes the overall volume of the audio and adjusts it to a standard level (based on the EBU R128 standard). This is perfect for handling recordings that are too quiet or too loud, or when you have a set of files with inconsistent volumes that need a unified listening experience.

This depends on your target format. If you convert to WAV or FLAC (lossless formats), the sound quality will be perfectly preserved. If you convert to MP3 or AAC (lossy formats), there will be very minor psychoacoustic loss, but by choosing a high bitrate (like 320k) or the highest quality VBR mode, this loss is almost imperceptible to the human ear.