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MP3 to FLACConverter — Fast & Free Online

MP3 to FLAC converts lossy MP3 audio into lossless FLAC, preserving the decoded PCM while increasing file size and ensuring gapless-ready playback.

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Source
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Supports all major formats

Up to 50 MB (free)BATCH SUPPORT
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1CONVERTER Media Team·Audio & Video Specialists·
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How MP3 to FLAC Conversion Works

MP3 is an audio format: it applies psychoacoustic lossy compression to remove frequencies the human ear perceives least, producing small files at acceptable audio quality. FLAC is an audio format that applies lossless compression to PCM audio, preserving the original waveform exactly while reducing file size by 40-60% versus WAV. This conversion changes the file's encoding, compression method, and supported feature set. The waveform is decoded and re-encoded without perceptual loss; if the source was already lossy, the encoder cannot restore detail the original codec discarded. Converting between these two formats is common when the source application does not support FLAC natively or when the target platform only accepts FLAC. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.

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How to Convert MP3 to FLAC

Follow these simple steps to convert your MP3 files to FLAC format in seconds

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Step 1

Upload your MP3 file(s) to the converter

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Step 2

Select FLAC as the output format and keep default audio settings unless you need a specific sample rate

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3

Step 3

Start the conversion to decode MP3 and re-encode the resulting PCM as FLAC

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Step 4

Download the generated .flac file(s) to your device

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Step 5

Verify tags/track duration in your player and, if needed, re-check metadata before archiving

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Average conversion time: Less than 2 minutes

Visual Conversion Preview

mp3

Source file

Size:2.4 MB
Format:MP3
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Converting...

flac

Output file

This visualization shows the typical conversion process from MP3 to FLAC format, including expected size reduction and quality retention.

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Choose Your Conversion Quality

Select the perfect balance between quality and file size for your MP3 to FLAC conversion

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Low Quality

Smallest file, basic quality

File Size:Very Small
Speed:Very Fast
Quality Level
Recommended
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Medium Quality

Balanced size and quality

File Size:Medium
Speed:Fast
Quality Level
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High Quality

Larger file, great quality

File Size:Large
Speed:Moderate
Quality Level
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Maximum Quality

Largest file, best possible quality

File Size:Very Large
Speed:Slow
Quality Level

tips_and_updatesQuality Selection Tips

When to use Low/Medium:

  • •Web uploads and social media sharing
  • •Email attachments with size limits
  • •Quick previews and thumbnails

When to use High/Maximum:

  • •Professional printing and publishing
  • •Archive and long-term storage
  • •When quality is more important than size

Audio Tip: For music, High quality (320kbps) is recommended. Medium quality works well for podcasts and voice recordings.

Why Convert MP3 to FLAC?

Discover the advantages of converting your MP3 files to FLAC format

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FLAC is lossless, so the output is an exact reconstruction of the decoded MP3 audio

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Better archival storage: FLAC supports metadata and can be re-encoded later without additional generation loss

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Higher integrity for audio analysis tools that prefer lossless containers and predictable decoding

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Supports embedded tags (artist/album/track) and common cover-art workflows in FLAC

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Widespread player support for FLAC while keeping original sample rate in typical conversions

Additional Features

169+
Supported Formats
<2 min
Average Time
24/7
Available
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Popular Use Cases

See how professionals use our MP3 to FLAC converter in real-world scenarios

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Archiving MP3 collections as FLAC for long-term storage and future reprocessing

Convert MP3 to FLAC for this purpose quickly and easily.

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2

Moving tracks into a DAW/library pipeline that works best with lossless formats

Convert MP3 to FLAC for this purpose quickly and easily.

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3

Maintaining consistent playback quality for hi-fi systems that favor FLAC

Convert MP3 to FLAC for this purpose quickly and easily.

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4

Preparing audio for remastering workflows where lossless handling of the decoded source is required

Convert MP3 to FLAC for this purpose quickly and easily.

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5

Building offline music libraries for devices that support FLAC natively

Convert MP3 to FLAC for this purpose quickly and easily.

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Trusted by Professionals In

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Web Development
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Content Creation
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MP3 vs FLAC

MP3 → FLAC

Source Format

MP3

Quality:good
File Size:small
Compatibility:universal

checkAdvantages

  • checkUniversal compatibility
  • checkVery small files
  • checkGood quality

closeDisadvantages

  • closeLossy compression
  • closeNot lossless
Target Format

FLAC

Quality:excellent
File Size:medium
Compatibility:wide

checkAdvantages

  • checkLossless quality
  • checkGood compression
  • checkMetadata support

closeDisadvantages

  • closeLarger than MP3
  • closeNot universally supported

MP3 → FLAC

FLAC offers higher quality than MP3. Convert your existing MP3 files when the target application, platform, or workflow requires FLAC.

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Frequently Asked Questions

Everything you need to know about converting MP3 to FLAC

No—MP3 is lossy, so converting to FLAC cannot restore information that was discarded by MP3 encoding. FLAC will be lossless, preserving the decoded audio exactly as produced from the MP3.
FLAC is lossless and stores compressed PCM without quality loss, so it typically takes more space than MP3’s perceptual lossy compression. The size increase depends on bitrate and content complexity.
In most conversions, the decoder outputs PCM at the MP3’s native properties (commonly sample rate and channel count), and FLAC is encoded from that PCM. If you change settings, those properties may be altered.
FLAC is widely supported by many players and audio libraries, especially for lossless playback. However, some devices still expect MP3, so you may need to keep MP3 versions for maximum compatibility.

Still Have Questions?

Our support team is here to help you with any questions about MP3 to FLAC conversion.

Contact SupportView All FAQs
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