Convert MP3 to FLAC

MP3 to FLAC converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.

Conversions

About formats

MP3

MP3 (MPEG-1 Audio Layer III) is the most popular lossy audio compression format, designed by the Moving Picture Experts Group. It drastically reduces file size while preserving near-CD quality by discarding sounds that are inaudible to most listeners. MP3 is supported by virtually every audio player, device, and platform ever made.

Developer
ISO/IEC (MPEG)
Initial release
1993
Compression
Lossy
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • Playing music on any device
  • Sharing audio online
  • Podcast distribution
  • Portable music libraries
  • Universal audio compatibility

Pros

  • +Supported by virtually every audio player
  • +Drastic file-size reduction from source
  • +Adjustable bitrate for quality/size balance
  • +Open and widely documented

Cons

  • −Lossy compression discards audio data
  • −Lower quality than AAC at same bitrate
  • −No multi-track support
  • −Generational loss on re-encoding

FLAC

FLAC (Free Lossless Audio Codec) is an open-source lossless audio format that compresses audio without discarding any information, typically reducing file size by 50-60% compared to WAV while allowing perfect reconstruction of the original signal. FLAC is the preferred format for high-fidelity music archives and audiophile collections.

Developer
Xiph.Org Foundation
Initial release
2001
Compression
Lossless
Color depth
up to 24-bit
Transparency
No
Animation
No

Best for

  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Pros

  • +Lossless compression with perfect reconstruction
  • +50-60% smaller than WAV
  • +Open-source and royalty-free
  • +Supports up to 24-bit depth and multi-track

Cons

  • −Larger than lossy formats like MP3
  • −Not ideal for streaming on limited bandwidth
  • −Less universal device support than MP3
  • −Some portable players lack FLAC support

How to convert MP3 to FLAC

  1. 1

    Select MP3 files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.

  2. 2

    Choose flac — or any other format you need as a result (more than 200 formats supported).

  3. 3

    Let the file convert, then download your flac file right away.

MP3 vs FLAC

PropertyMP3FLAC
CompressionLossyLossless
Color depthup to 24-bitup to 24-bit
Multi-trackNoYes
DRM supportNoNo
Open formatYesYes

When to use MP3 vs FLAC

MP3

  • Playing music on any device
  • Sharing audio online
  • Podcast distribution
  • Portable music libraries
  • Universal audio compatibility

FLAC

  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Use cases for MP3 → FLAC

  • Playing music on any device
  • Sharing audio online
  • Podcast distribution
  • Portable music libraries
  • Universal audio compatibility
  • High-fidelity music archives
  • Audiophile music collections
  • Lossless audio preservation
  • Mastering and audio production
  • Backing up CD-quality music

Frequently Asked Questions

Is converting MP3 to FLAC free?
Yes. This MP3 → FLAC converter runs entirely in your browser and is completely free — no account, no credits, no watermark.
Which devices and platforms can I use to convert MP3 to FLAC?
Any modern device with a current web browser: Windows, macOS, Linux, Android, iPhone and iPad. There is nothing to install — the conversion happens locally.
Are my MP3 files uploaded to a server?
No. Files never leave your device. The entire MP3 → FLAC conversion runs locally in your browser, so your data stays private.
Can I convert multiple MP3 files at once?
Yes — batch conversion is supported. Add as many MP3 files as you like and convert them to FLAC in one pass, then download the results together.
What is the maximum file size?
There is no fixed server-side limit because the conversion happens in your browser. Practical limits depend on the available memory and CPU of your device.
Will converting MP3 to FLAC lose quality?
No. FLAC is a lossless format (or used in a lossless mode here), so the original data from your MP3 file is preserved bit-for-bit in the converted result.
Does FLAC support transparency?
No — FLAC has no alpha channel. Transparent areas of your MP3 file will be filled with a solid background colour in the converted file.
Will the converted FLAC file be larger than the MP3?
Usually yes — converting from a lossy format to a lossless one means the FLAC file preserves full detail and therefore grows compared to the MP3 original. Expect a roughly 30–60% size increase for typical content.

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FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

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