Question 1

How do I check the bitrate of an MP3?

Accepted Answer

Drop the MP3 and read the Average bitrate row. It is the file size divided by the duration, so for a variable bitrate (VBR) file it is the average over the whole song. Large cover art adds a little to the number.

Question 2

What is the difference between the container and the codec?

Accepted Answer

The container is the file format that holds the audio, like MP4, M4A, Ogg or WAV. The codec is how the sound itself is compressed, like AAC, MP3, Opus or FLAC. An M4A file usually holds AAC audio, and an Ogg file can hold Opus or Vorbis.

Question 3

Can it tell me whether a FLAC is really lossless?

Accepted Answer

No. It shows that the file uses the FLAC codec, but not whether it was made from an MP3 or another lossy source. Checking that takes a frequency analysis, which this tool doesn't do.

Question 4

What sample rate should my audio have?

Accepted Answer

44,100 Hz is the CD and music standard, and 48,000 Hz is the standard for video. Higher rates like 96,000 Hz come from studio recordings.

Question 5

Can I check the audio inside a video?

Accepted Answer

Yes. Drop the video and you see the codec, sample rate and channels of its sound track. The bitrate row then shows the average for the whole file, picture included.

Question 6

Is there a file size limit?

Accepted Answer

No. The tool only reads the file and doesn't save a new one, so the download limit for free files doesn't apply.

Question 7

Is my file uploaded?

Accepted Answer

No. The file is read in your browser and never leaves your device.

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