FLAC vs MP3: The Simple Guide for Everyone

Did you ever wonder why some music files take up a great deal of space while others are just a mere few kilobytes? Or why do audiophiles become so intense and focused on their digital music collection? The solution, more often than not, lies in the fundamental difference between two music file formats: FLAC and MP3.

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If you have ever been baffled by terms like “lossless”, “bitrate”, or “compression”, then this guide is just for you. It basically serves as the non-technical explanation of the FLAC vs MP3 battle for the general public rather than sound engineers. We are going to explain the pros and cons of the two to help you choose the one most compatible with your ears and gadgets.

The Core Difference: A Simple Analogy

Maybe the best comparison is that of a photograph.

FLAC corresponds to a ZIP file for a hi-res PNG image. Decompressing it means you get back the exact same, flawless artwork, pixel by pixel. There is no loss.

MP3 can be compared to the situation where the very same image is recorded as a JPEG. In order to reduce the file size, the compression scheme gets rid of some of the visual data that it assumes is not perceptible to you. The resulting file is considerably smaller, but it is not the original. If the compression is taken to the extreme, the visual quality degrades and artefacts become visible.

So this is the main controversy: FLAC is “lossless”, while MP3 is “lossy”.

What is MP3? The Everywhere Format

MP3 (MPEG 1 Audio Layer III) is a file format that was a game changer in the music industry. Installing it was like being able to keep tens of thousands of songs on a device with the dimensions of a pack of gum. The best thing about it is that its file size is very small.

How it works: MP3 relies on “perceptual coding”. It evaluates the sound and, to save space, removes those parts that are inaudible for human ears. For example, a very quiet sound that is hidden in a louder one. The amount of information removed depends on the bitrate (kbps, kilobits per second).

Low Bitrate (for instance, 128 kbps): A large part of the data is removed. Leads to files with small sizes but of noticeably lower quality. The sound may be lacking in bass, “tinny”, or without power.
High Bitrate (for instance, 320 kbps): A smaller part of the data is removed. Leads to files with larger sizes but of very good quality. For most people, on most equipment, a 320 kbps MP3 is almost the same as the original one.

Advantages of MP3:

Small File Size: You can put more songs on your phone and computer.
Universal Compatibility: Can be used on any device, be it a smartphone, car stereo or smart speaker.
Faster Streaming: Less mobile data and bandwidth are used.

Disadvantages of MP3:

Reduction in Quality: Some audio information is permanently removed.
Not Suitable for Archiving: Once a file is compressed into MP3, you cannot get the original quality back.

What is FLAC? The Audiophile’s Choice

FLAC (Free Lossless Audio Codec) is the one with the highest quality. Its target is flawless retention. It is a lossless one, as the term implies no data is removed during compression.

Explanation: I would compare it to zipping a file on your computer. The file is made smaller for storage and transfer, but after unzipping, you get the very same file, unchanged. FLAC works the same way but for sound. It reduces the size of the recording to around half or a bit more of the original, but the output is still a perfect bit-for-bit rendition of the source (e.g., a CD).

Advantages of FLAC:

Perfect Sound Quality: No less than the set standard of studio sound produced by the artist and the sound engineer is what is delivered to your ears.
Great Archiving Material: Any format can be derived from a FLAC file without the slightest quality degradation. It’s the perfect digital master file.
Supports High Resolution: FLAC is capable of delivering even higher than CD standard (e.g., 24 bit/192 kHz), which is great for audiophiles with top-end equipment.

Disadvantages of FLAC:

Still, a FLAC file takes up a lot of space: Normally a single file in the FLAC format is 5 to 10 times larger than a 320 kbps MP3.
Compatibility is Limited: Even though more and more devices support it, there still might be some very old car stereos or specific smartphones that cannot play FLAC files natively.
Quite a Bit Heavy: Streaming of a FLAC file will require a significantly higher amount of data and thus lead to that much storage space usage.

FLAC vs MP3: Side-by-Side Showdown

Feature	FLAC	MP3
Compression Type	Lossless	Lossy
Sound Quality	Perfect, identical to the source	“Good enough” to “very good”
File Size	Large (e.g., 30-50 MB per song)	Small (e.g., 3-10 MB per song)
Best For	Archiving, critical listening, hi-fi systems	Everyday listening, portable devices, storage space
Compatibility	Good (and growing)	Excellent (universal)

So, which one should YOU use?

The answer is not a single solution for all. It mainly depends on what you need.

If that is true, then you are supposed to use FLAC in the following cases:

You are an audiophile with top-notch equipment: In case you own a quality DAC (Digital to Analogue Converter), a nice amplifier, and high-fidelity headphones or speakers, it is almost certain that you will notice the subtle differences that FLAC offers. The more advanced your equipment, the more you will be able to hear the advantages.
You Want a “Future Proof” Music Library: The act of buying and downloading music and then storing it in FLAC means that you hold the best possible version of the file. Converting it into MP3 for your phone can be done anytime, but the other way round is not possible.
You are a music archivist or enthusiast: when it comes to your CD collection or live recordings, FLAC is the absolute winner.

If that is the case, then MP3 would be the right choice for you in the following situations:

You Listen on the Go: Whether it is a noisy car, a public transport ride with earbuds, or through a Bluetooth speaker, the subtle advantages of FLAC are usually inevitable to the background noise. The smaller file sizes are more practical.
You Have Limited Storage Space: Taking the example of a 64GB phone, filling it with FLAC files means that you will be able to store much less music than if you go with MP3s.
You Stream Music: That is the case for most streaming services (like Spotify at its standard tier), which utilise lossy formats that are similar to MP3. Whereas Tidal and Amazon Music HD provide lossless, the standard quality for most users is lossy, and that is perfectly fine.
You Just Want It to Be Simple: MP3 is compatible with everything and does not require any time. A high bitrate (256 or 320 kbps) MP3 will give nearly perfect audio to the vast majority of people.

The Bottom Line: There Is No “Wrong” Choice

The FLAC vs MP3 debate is not about one format being better than the other. Instead, it is about knowing the compromise between quality and convenience.

Using FLAC is a good idea if you value the best quality. It refers to saving the absolute best quality for critical listening and archiving.
On the other hand, MP3 is a good choice if you prioritise the ease of use. It is about being able to take your music anywhere without consuming much storage or data.

In fact, you can have a FLAC library for the best quality on your home system and also have MP3 copies for your portable devices. But today, you only need to decide whether you are listening for the finest sonic details or just enjoying the music.

Most times and for most people, a good-quality MP3 will be sufficient. Yet, it is great to know that when you want to be more intimate with the music, you can always turn to FLAC, which provides a perfect glimpse of the sound the artists made.