FLAC to MP3 Converter
Your lossless library, playable everywhere. Drop FLAC files, get MP3s back — 100% in your browser. No uploads, no accounts, no per-day cap.
FLAC sounds perfect and plays almost nowhere portable: car stereos, older phones and many players only accept MP3. This converts it on your device, privately — the only client-side FLAC to MP3 converter that never uploads a byte.
Drop your FLAC files (.flac) here
or — or paste a copied file straight in
Up to 200 MB per file · up to 2 hours per track · up to 5 files per batch · file data never leaves your device
Privacy proof — verify it yourself
This page processes your music entirely on your device. All JavaScript and the engine are bundled locally on this site. File and audio data never leaves your device; the only third-party requests are the site’s own analytics (Google Analytics and a Cloudflare beacon), which load when the page opens and never see your files. Your music library is personal; it never leaves the machine you are sitting at.
New requests during use: 0 to this site (the converter engine, fetched in two parts on first use) · 0 to anyone else (none — as it should be)
Converter engine: ffmpeg.wasm — loads on first convert
- Press F12 to open developer tools, then open the Network tab.
- Drop a FLAC file above and let it convert.
- Watch the Network tab: no new requests while it converts, apart from the converter engine on first use. The counter above shows the same split live. (The page’s own analytics load once when the page opens — before you start — and never touch your files.)
- Bonus: turn your internet off after the page loads and the engine has loaded once — conversion still works.
How to convert FLAC to MP3 without uploading it
- Drop your .flac files above — up to 5 at once, 200 MB each. Each track’s sample rate, bit depth and length are shown straight away, with an estimated MP3 size at your chosen bitrate.
- Pick a bitrate. 192 kbps is the sweet spot for most music; 256 or 320 kbps for critical listening; VBR if you do not want to think about it.
- Download each MP3, or grab everything as one ZIP. Your originals are untouched and file data never leaves your device.
Why convert FLAC at all?
FLAC is lossless: every bit of the original recording is preserved, which is why collectors and audiophiles rip to it. But FLAC is not universal — car stereos, older phones, some smart speakers and many portable players only accept MP3. Converting trades some audio data (MP3 is lossy) and a usually smaller file for a file that plays practically anywhere. Keep the FLAC as your master copy; the MP3 is the portable copy.
Honest limitations
- MP3 is lossy — audio data is discarded and cannot be recovered. At 256–320 kbps or VBR the difference is inaudible to almost everyone; at 128 kbps you may hear it on detailed music. Keep the FLAC as the master.
- 24-bit / 88.2–96 kHz FLAC is resampled — MP3 tops out at 48 kHz and 16-bit, so hi-res files are downsampled automatically. Nothing you can hear is lost, but the extra resolution is gone in the MP3.
- Tags are carried over where ffmpeg maps them — title, artist, album, album artist, track number, date, genre and composer. Embedded cover art is dropped, and replaygain and custom tags are dropped.
- Long files are slow in-browser — encoding runs at roughly real-time speed, so a 60-minute album takes on the order of an hour. Files over 30 minutes get a warning before converting. For a whole library, a desktop converter will be much faster.
- 2-hour / 200 MB caps — a single-file album over 200 MB must be split first. Batches are limited to 5 files so the tab does not run out of memory.
- No DRM FLAC — encrypted or DRM-protected files cannot be decoded in the browser and will fail with a decode error.
- First convert loads the engine — the converter (ffmpeg.wasm, ~31 MB) downloads once from this site on your first conversion. After that it is cached and works offline.
- MP3-only output — this tool makes MP3s. If you need WAV, OGG or AAC, use a desktop converter.
Frequently asked questions
How do I convert FLAC to MP3 without uploading it?
Use a tool that converts locally in your browser. This converter loads your FLAC file into your device’s memory, decodes it with ffmpeg.wasm running on your machine, and encodes it as MP3 — all with JavaScript and WebAssembly running locally. Your music files never leave your device; the only third-party requests on this page are the site’s own analytics (Google Analytics and a Cloudflare beacon), which load when the page opens and never see your files. You can verify it by watching the Network tab in your browser’s developer tools while it converts — the live counter on this page shows no new requests during processing. The page keeps working with your internet disconnected after it loads (the converter engine is fetched once from this site on first use).
Will converting FLAC to MP3 lose quality?
Yes — MP3 is a lossy format, so some audio data is discarded and cannot be recovered. That is the price of a file that plays everywhere. At 256 or 320 kbps, or with the VBR setting, the difference from the FLAC original is inaudible to almost everyone on normal headphones and speakers; at 128 kbps you may hear it on detailed music. Keep your FLAC files as the master copies and treat the MP3s as portable copies for your phone, car stereo or any player that does not support FLAC. The original FLAC is never modified.
What bitrate should I choose — 128, 192, 256 or 320 kbps?
192 kbps is the sweet spot for most music — small files that sound great on a phone or in the car. Choose 256 or 320 kbps for music you listen to critically, or if you are archiving a collection you may not want to re-encode. Choose 128 kbps only for casual listening or when file size matters most, such as a small-capacity player. VBR (quality 2) is the smartest choice if you do not want to think about it: it spends more bits on complex passages and fewer on simple ones, averaging around 190 kbps for music, and usually sounds as good as 256 kbps CBR at a smaller size.
What happens to my tags — artist, album and track names?
Tags are carried over where present: title, artist, album, album artist, track number, date, genre and composer are copied from the FLAC file into the MP3’s ID3v2 tag, so your music library keeps its organisation. Two things do not carry over: embedded cover art is dropped (the MP3 has no picture track), and anything else in the FLAC tags — replaygain values, custom fields — is dropped. If your tags matter, check one converted file before converting a whole album.
What about 24-bit / 96 kHz FLAC files?
They convert fine, but MP3 has a ceiling: 48 kHz sample rate and 16-bit depth. A 24-bit / 88.2 or 96 kHz FLAC is resampled automatically to 48 kHz / 16-bit during conversion, and the page says so on the converted file. Nothing you can hear is lost — 48 kHz / 16-bit already covers the full range of human hearing — but the extra resolution of a hi-res master is gone in the MP3. Keep the FLAC as your master copy if hi-res matters to you.
Can I convert a whole album at once?
Yes — drop up to 5 FLAC files at a time (200 MB each), and download them one by one or all together as a ZIP. Files convert one after another, each with its own progress bar, so a long track does not block the shorter ones behind it. In-browser encoding runs at roughly real-time speed, so a 60-minute album takes on the order of an hour on a typical laptop and the page warns you about files over 30 minutes. For a whole library of albums, a desktop converter will be much faster — this tool is best for albums and batches, not bulk-ripping a collection.
How do I verify my files never upload?
Open your browser’s developer tools (F12), go to the Network tab, then convert a file. You will see no new requests while it converts — the live counter on this page shows the same number. The only requests during processing are the converter engine itself (ffmpeg.wasm, about 31 MB), fetched in two parts from this same site on first use. All JavaScript and the WebAssembly engine are vendored locally on this site. The only third-party requests are the site’s own analytics (Google Analytics and a Cloudflare beacon), which load when the page opens — they never see your files.