MP3 to FLAC converter
Upload a MP3, get a polished FLAC back in seconds. StandardsPDF handles the conversion in your browser so your files stay yours.
Convert MP3 to FLAC
Drop your files to try StandardsPDF. This tool is available in the full workspace.
Preserves bitrate and channels for clean playback
Handles long recordings and full albums in one job
Works in any modern browser – desktop, tablet or phone
Free to try with no account and no watermark
How it works
Convert MP3 to FLAC in 3 steps
Select the MP3 you want to convert
Start the conversion – most finish in seconds
Grab your new FLAC, ready to use
Private by default
Files are encrypted in transit and deleted within 60 minutes.
Fast
Most jobs finish in under 10 seconds. No queueing.
No signup on free tier
5 documents per day, no credit card required.
FAQ
Frequently asked questions
How do I convert MP3 to FLAC?+
Upload your MP3 file (or drag it onto the box above), wait a few seconds while StandardsPDF converts it in your browser, then download the FLAC. There is nothing to install and no account required.
Is converting MP3 to FLAC free?+
Yes. MP3 to FLAC conversion is free on the StandardsPDF free tier – no watermark, no signup, and no credit card. A Pro tier lifts the file-size and daily limits if you need more.
Will the FLAC keep the quality of my MP3?+
StandardsPDF aims for the highest fidelity the FLAC format allows, so your audio file comes through looking as close to the original as possible. Some format-specific details may adapt where FLAC works differently to MP3.
Can I choose the bitrate when converting MP3 to FLAC?+
On the free tier StandardsPDF picks a clean default bitrate for your FLAC; Pro lets you set the exact bitrate and sample rate for the MP3 to FLAC conversion.
How long does a MP3 to FLAC conversion take?+
Most MP3 files convert to FLAC in a few seconds. Larger or higher-resolution files take a little longer, but there is never a queue on the free tier.
Is my MP3 file kept private during MP3 to FLAC conversion?+
Yes. Your MP3 is processed in an isolated worker, never shared, and permanently deleted from our servers within 60 minutes. Most MP3 to FLAC conversions happen right in your browser.
Do I need to install anything to convert MP3 to FLAC?+
No. Converting MP3 to FLAC runs entirely in the browser – no desktop software, no extensions and no account for the free tier.
What is the maximum MP3 file size I can convert to FLAC?+
Up to 100 MB per MP3 on the free tier and 2 GB on Pro. If your MP3 is larger, split it first or upgrade for the higher limit.