FLAC Vs MP3 – Differences Explained

FLAC is a lossless compression format that keeps CD-quality sound while using up half the space of WAV files. FLAC is a great ‘middle ground’ for music lovers because of this. Because MP3 format are smaller and of lower quality, they are a superior option for streaming, sharing, and downloading to mobile devices.

Which format is preferable? When should each format be used? Alternatively, perhaps you’re simply curious and would like to learn more. Regardless of the cause, we’ll cover it everything in this post.

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What Is A FLAC file?

FLAC is an abbreviation for Free Lossless Audio Codec, and it is a clear audio format that preserves high sound quality. Despite the fact that the actual resolution varies on how often sound data is compressed, audio streams compressed with FLAC can also be reduced to 50–70% of their original dimensions.

The compression level of FLAC files is measured on a scale of 0 to 8, with 8 being the most reduced. While the quality remains essentially constant between 0 and 8, the decoding and encoding times are significantly longer, and higher compression settings can be much more CPU intensive.

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The ‘quality’ of FLAC files is determined by the ‘sample rate’ and ‘bit depth’. Sample speeds range from 22,050 hz to 32,000 hz, 44,1000 hz to 48,000 hz, 88,200, 96,000 hz to 192,000 hz, with bit sizes ranging from 8 to 32 bits.

Because FLAC data are uncompressed, they can be quite large when compared to MP3 files. Although a one-minute sound sample with industry-standard sampling frequency and bitrate will be around 9mb, much less than a WAV format, the file volume is determined by the compression level used.

FLAC files were designed to capture the whole frequency range that the ear can hear, ranging from 20hz (extremely low bass frequency) to 20khz (very high pitch frequency).

FLAC files have become increasingly popular among music fans and audiophiles for these grounds.

How Are FLAC Files Encoded?

FLAC data go through three phases of encoding:

  • The sound data is first broken down into discrete blocks.
  • Each component is then linked to a mathematical forecast.
  • Finally, using the statistical forecast, the pattern is recreated.

Blocking: The sound data is divided into several blocks of varying sizes. The sampling rate, acoustic properties over time, and other factors are usually used to determine the block size.

Primarily on the basis and variance (collectively) of the right and left and streams, the generator will create middle and side outputs for stereo streams. The best version of the information will then be transported to the next level by the encoder.

Prediction: The encoder attempts to generate a mathematical representation of the sound signal during the prediction stage of the block. This representation is usually much shorter than the original signal.

Because both the decoder and the encoder are aware of the prediction methods, only the predictor’s variables must be presented in the reduced channel.

Residual coding: The predictor selects the encoding during encoding to recreate the data. The gap between the anticipated signal and the original data must be encoded losslessly if the forecast doesn’t accurately capture the signal.

What Is An MP3 File?

The Moving Picture Experts Group invented MP3 as a digital sound format to replicate the sound quality of CDs while having a substantially smaller file space.

MP3 and MPEG Layer 3 documents are both the same file type.

Compressed MP3 files could be as little as ten percent of the original WAV data size. This implies that a 50MB WAV format can be reduced to just 5MB with MP3 compression.

To lower the file size, a few of the original sound files must be eliminated. This is referred to as ‘Lossy Compression,’ since it results in a minor loss of sound clarity.

Therefore, how can the system choose which sounds should be removed? Temperal Noise Shaping, a technique, is responsible for this.

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MP3 bitrates range from 48 to 320 kbps and include 48, 56, 64, 96, 192, 256, and 320 kbps (kilobits per second). The bitrate is the amount of data saved each second. For instant, a 256kbps song on iTunes will hold 256 kilobits of data every second.

In other words, the greater the bitrate, the greater data is inspected and the image becomes crisper. Because less data is processed at a reduced bitrate, the quality falls as a result.

FLAC formats typically have a bitrate of 1024kbps, whereas MP3 files have a bitrate of 320kbps. MP3 compression comes in two forms: fixed bitrate and variable bitrate.

The term “consistent bitrate” refers to a bitrate that remains constant throughout a sound file. This means that if the MP3 format maintains a constant bitrate of 192kbps throughout the sound sample, the decrease will remain constant.

Variable bitrate compression is a type of sophisticated compression in which the bit level varies over time depending on where coding system believes greater or less compression is required. If the computer judges that some parts of the record can be reduced to 96kbps and others to 320kbps, it will do so.

How Are MP3 files Encoded?

The temporal noise shaping technique, as we previously said, determines the data that is eliminated or lost, but what precisely is it?

Temperal noise structure use a method to decide which frequencies should be removed from the sound, with only those frequencies removed that are scarcely detectable to the human ear. The compression principles are governed by these algorithms.

There are numerous independent facts and frequencies that the ear cannot clearly hear in the context of a broadcast. It can be deleted from a sound transmission without having a substantial impact on the sound quality while still allowing for significant cost savings.

The human ear can now detect frequencies in the range of 20 Hertz to 20 KHz. Using MP3 compression, this range can be lowered to 20 Hz to 18 kHz or even lower.

While the loss of dynamic variation may not be obvious to the casual listener, producer or a experienced sound engineer will find it unsatisfactory.

Because different MP3 algorithms have slightly varying features, the same song can be processed with slightly varying MP3 algorithms.

Compression Issues With MP3

Because info from the sound source is lost, there are a variety of difficulties that can occur as a result of reduction.

Low and sub frequencies that are weak

One of MP3’s numerous flaws is its proclivity for turning a stone bass into a mushy muddle.

The bass will not completely cycles in the time required for the technique assessment to loop because low frequency pulses are longer and there is limited amplitude change over the brief search window the encoder works in.

The AAC format, for example, is a substantially superior encoding approach that preserves far more low and sub frequency information.

Dynamic range is reduced

When a compression method eliminates frequencies that are hard to hear by the human ear, it results in a reduction in dynamic range.

The average person can perceive a dynamic spectrum of 20 Hz to 20 kHz.

The lesser the bitrate and the stronger the compression, the less dynamic variance there is.

From URM Academy

Unnecessary noise created

Because the encoding procedures rely on the ear’s incapacity to listen to specific frequencies, noise can occasionally be produced as a by-product of this coding that fits in the identical region as the deleted frequencies.

This extra noise may go unnoticed by the typical listener, but it can be easily detected using a spectral meter.

Desired sounds deleted

The compression algorithms have been given a list of conditions to follow, advising them on what to keep and what to remove.

This is normally OK, but also because the input source varies frequently, the program may occasionally filter out sounds that the listener would perceive.

As a result, several programmers have developed their unique audio compression techniques.

Volume changes in the signal

Due to the loss of some frequencies during MP3 encoding, other frequencies may look much higher than they would otherwise.

These wavelengths’ levels do not fluctuate; it is only our perception of them that leads us to believe they are higher than they are.

This is known as ‘perceived volume,’ and it is a complicated phenomena that experts are still trying to understand.

Double Speak

Audio timing issues are another concern that might come with MP3 encoding.

This distortion is most obvious on voices, making a solo voice sound multilayered, double-tracked, or robotic.

Lower MP3 bitrates show these artifacts more prominently.

FLAC Pros and Cons


  • High-Quality Sound

One of the explanations FLAC is becoming more widespread is that it transmits data at a greater quality than MP3. FLAC is an uncompressed format that preserves all of the audio and content from the recorded version.


  • File size can be large

FLAC file formats can be rather huge when compared to MP3 ones. A 10MB MP3 file would be stretched up to 50 or 60 Megabytes with FLAC compression.

Higher compression levels can reduce file size, but they also need more CPU processing power.

  • It consumes greater processing power

Higher compression settings will consume more system components. This is fine if you ‘re operating a computer or even other device that’s plugged into the wall.

Moreover, applying FLAC on a mobile device might drastically degrade life of the battery.

Which Is The Superior Option? MP3 vs. FLAC

There really is no correct answer towards this dilemma because each format fulfills the purpose for which it was created.

MP3s are popular for music sharing, transferring music to portable devices, and posting music to websites because they reduce page load speed.

FLAC records are a hybrid of WAV and MP3 formats. They’re useful because of their excellent condition, but the file sizes can be pretty large.

  • If space on your hard drive isn’t an issue, FLAC is the way to go because the sound quality makes songs so much more delightful to listen to.
  • If you don’t have enough space on your hard disk, MP3 is an excellent alternative because the size of the file is little but the quality remains high.

Other Common Audio Formats


WAV formats are a lossless sound format that keeps the best sound clarity possible.

The size of the file can be 1,000 times that of an MP3 format.

In WAV format, a 10MB MP3 would be 100MB.


An OGG format is an encoded sound file with a structure similar to that of an MP3, but with significantly better quality due to dynamic bitrate encoding.

As a result, streaming sites like Spotify have helped it become a popular alternative.


It’s as simple as that. This FLAC vs. MP3 comparison article, I hope, has given you a better understanding of MP3  and FLAC files, and also how to handle and use them.

Now that you have all of the information, you can make a better informed decision on which format to use in the long term.

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