flac

Two FLAC files: a 1 second clip of 20 KB and a 5 second clip of 69 KB, both a 440 Hz tone. FLAC is lossless compression, so it is larger than MP3 or Opus but smaller than WAV, and it is popular with audiophiles, podcasters and archive projects. The size does not grow in a straight line with length, because compression works better on some stretches than others. Use these files to test whether players and uploaders accept FLAC, whether size limits behave sensibly for lossless audio, and whether a converter turns FLAC into a lossy format without errors.