How to convert MP3 to FLAC
- Click Choose files or drop your MP3 files into the box above.
- Pick the sample rate if you need a specific one and, optionally, trim the start or end.
- Click Convert and download the FLAC when it is ready.
MP3 vs FLAC
| MP3 | FLAC | |
|---|---|---|
| Compression | Lossy | Lossless |
| Typical bitrate | 128–320 kbps | 700–1,100 kbps (CD quality) |
| Size | 1–2.4 MB per minute | 5–8 MB per minute |
| Plays on | Everything: every phone, car stereo, speaker and app | Android, Windows 10+, macOS, iPhone (Files app) and most hi-fi players |
| Best for | Music and podcasts that must play anywhere | Archiving music and listening without any quality loss |
About MP3 and FLAC
What is MP3?
MP3 is the most compatible audio format there is. It shrinks music to about a tenth of CD size by removing sounds people hardly hear. At 192–320 kbps most listeners cannot tell it from the original, and every device ever made with a speaker can play it.
- Plays on every device
- Small files
- Lossy
- Slightly less efficient than AAC or Opus
What is FLAC?
FLAC compresses audio without losing a single bit, usually to about half the size of WAV. It is the favorite format of audiophiles and music archivists: you get perfect CD (or hi-res) quality with proper tags and cover art, at the cost of files several times larger than MP3.
- Lossless: identical to the original
- About half the size of WAV
- Full tags and cover art
- Much larger than MP3
- Not supported by some car stereos and older devices
Why GlideConvert?
- Private by design. Your files are converted on your own device by your browser — they are never uploaded to a server. That keeps them private, avoids upload waits and means there is no queue.
- Fast. Images convert in a fraction of a second; video uses your device’s hardware encoder.
- Free. No sign-up, no watermark. 10 images, 5 audio files or one video at a time — Pro lifts the limits and removes ads.
Frequently asked questions
Will converting MP3 to FLAC reduce quality?
FLAC is lossless, so nothing is lost — but if the source is a lossy format (MP3), the result cannot sound better than the original; it will only be bigger.
Are song titles, artists and cover art kept?
Yes, where FLAC supports them: title, artist, album, track number and similar tags are copied from the MP3 file.
Is there a file size limit?
On the free plan each video or audio file can be up to 500 MB and each image up to 100 MB. With Pro the limit is 4 GB per file. Because everything happens on your device, the practical limit for very large files is your device’s memory.
Are my files uploaded to a server?
No. GlideConvert runs entirely in your browser: images are processed with the browser’s built-in codecs and WebAssembly, video and audio with hardware-accelerated WebCodecs (or a WebAssembly build of FFmpeg for older formats). Nothing is sent anywhere — you can even disconnect from the internet once the page has loaded.
Does it work on iPhone, Android, Mac and Windows?
Yes. It works in any up-to-date browser — Chrome, Edge, Safari, Firefox or Samsung Internet — on phones, tablets and computers, with nothing to install. On phones, extremely large images may be scaled down to fit within the browser’s memory limit; you will see a note if that happens.