什么是MP3？
MP3（MPEG-1音频层III）是一种有损音频压缩格式，通过去除人耳最不容易察觉的声音来减少文件大小，达到接近CD质量的10:1压缩比。
最后更新:
What is it?
MP3（MPEG-1音频层III）是一种音频编码格式，由弗劳恩霍夫协会开发，并于1993年标准化。它使用心理声学压缩——去除人耳最不敏感的音频频率——以实现显著的文件大小减少。
MP3是历史上最被广泛认可的音频格式。128 kbps的MP3文件大约比等效的未压缩WAV文件小10倍，质量在休闲听音中大多数听众认为与原始音频无法区分。
Technical Specifications
Pros & Cons
Advantages
Every device that plays audio supports MP3 - no exceptions.
10:1 compression ratio compared to uncompressed audio at acceptable quality.
Choose from 32 to 320 kbps to balance file size and audio quality.
Small sizes and broad support make it ideal for music streaming and download.
Disadvantages
Audio data is permanently discarded - quality cannot be restored once compressed.
Never use MP3 in a recording or editing workflow - always work in lossless formats.
AAC and OGG Vorbis offer better quality at the same bitrate than MP3.
Re-encoding from MP3 to MP3 degrades quality each time.
When to Use It
当兼容性和小文件大小比完美的音频保真度更重要时，MP3是正确的选择。
Music Distribution
The standard format for downloaded and streamed music due to its small size and universal support.
Podcasts
Voice audio at 128 kbps MP3 sounds excellent with minimal file size.
Background Audio
Website background music, sound effects, and non-critical audio content.
Legacy Devices
MP3 players, car stereos, and older devices that may not support newer formats.
Convert Your Files Online - Free
Our free online converter supports all major formats. No software to install, no registration required.
Start Converting NowFrequently Asked Questions
What bitrate should I use for MP3?
128 kbps for voice and casual listening, 192 kbps for music as a good balance, 320 kbps for highest quality. Most people cannot distinguish 256 kbps from lossless in a blind test.
Is MP3 or AAC better?
AAC generally produces better quality at the same bitrate. However, MP3 has broader compatibility, especially with older devices. For new projects, prefer AAC or OGG Vorbis.
Can I restore quality to an MP3?
No. Lossy compression permanently removes audio data. You cannot recover quality from an MP3 - always keep the original lossless source file.
What is the difference between MP3 and WAV?
WAV is lossless and uncompressed - perfect quality but very large files. MP3 is lossy and compressed - much smaller files at the cost of some audio quality. Use WAV for production, MP3 for distribution.
Is MP3 still relevant today?
Yes. Despite newer formats like AAC and OGG offering better compression, MP3 remains dominant due to its universal compatibility. It is still the most widely used audio format in the world.