Yes. MP3 is lossy, so some audio data is removed. At 320 kbps the difference is minimal for most listeners, but audiophiles may notice it.
128 kbps for voice recordings, 192 kbps for casual music listening, and 320 kbps for the best MP3 quality.
You can convert the file, but the quality lost during MP3 encoding cannot be recovered. The resulting FLAC will be lossless but not better than the MP3.
Yes. MP3 is supported by virtually all car stereos, either via USB, SD card, CD, or Bluetooth.
Yes. Album art from the FLAC file is embedded in the MP3 ID3 tags.
CBR (Constant Bit Rate) uses the same bitrate throughout. VBR (Variable Bit Rate) adjusts the bitrate based on audio complexity, giving better quality at smaller file sizes.
The tool converts one file at a time. For batch conversion, use a desktop tool like fre:ac or dBpoweramp.