Your browser decodes the MP3.
The page reads the rate the MP3 was saved at from its first frame. Your browser then decodes the sound on this device at the rate you choose, 44.1 or 48 kHz.
SOLIPSIUM Super resolution audio engine
Free audio tool
Convert MP3 to WAV for an editor or an upload form.
Decode an MP3 to a 16-bit WAV at 44.1 or 48 kHz in your browser. The page also shows where the MP3's sound stops, so you can see what it kept.
Drop an MP3 here
Your browser converts it to WAV on this device. It stays on your device until you ask for a repair.
MP3, or any audio file your browser opens, up to 30 minutes or 200 MB.
Your file
Where the sound stops
Read from the first five minutes.
The WAV holds this same sound, so it stops at the same place. The audio spectrum check draws the spectrogram.
For a spoken recording
Converting does not clean the sound. Solipsium's free try is built for speech: the check looks in your browser for background noise, hum, clipping, dropouts and muffled sound, and you can hear the first 20 seconds of a voice recording repaired with no account.
The check in your browser hears recordings of up to five minutes. For a longer one, make a free account: the editor scans recordings up to 30 minutes.
Your first 20 seconds
After signing up, drop the same file into the editor to repair all of it.
What Solipsium hears
Make a free account to repair the whole recording
Then drop the same file into the editor. Scans and short repairs are free.
How it works
A WAV made from an MP3 holds the MP3's sound.
An MP3 left some sound out when it was made, usually all the treble above a cutoff its encoder chose. Decoding writes out what remains, sample by sample, in a format editors and upload forms take.
The page writes 16-bit samples.
Each sample becomes a 16-bit value, the depth of a CD, in an uncompressed WAV. The size follows from that: two bytes per sample per channel, so a minute of stereo at 44.1 kHz is about 10 MB.
It reads where the sound stops.
The reading is the spectrum check's: the highest band still within 45 dB of the level between 0.5 and 4 kHz, found in each 5-second block, then the middle value of all the blocks.
Questions
Before you convert.
Will the WAV sound clearer than the MP3?
No. It holds the same sound in a larger file, and whatever the MP3 left out stays out. Convert when an editor or an upload form asks for WAV, or before you edit, so saving the edit does not compress the sound a second time.
Which rate should I choose?
48 kHz for video editors, 44.1 kHz for music tools and CDs. The page starts on 44.1 kHz for an MP3 saved at 44.1 kHz and on 48 kHz for one saved at 48 kHz, so the WAV keeps the MP3's rate.
How large will the WAV be?
The panel shows the size before you download. A minute of stereo at 44.1 kHz takes about 10 MB, about 11 times a 128 kbps MP3 of the same length.
Can I get a 24-bit WAV?
No. The page writes 16-bit samples, the depth of a CD.
Where does my MP3's sound stop?
The panel reads it from the first five minutes. A stop between 15 and 17 kHz is typical of a 96 to 128 kbps MP3, and a 256 or 320 kbps MP3 can reach the top of the range. Some encoders cut on purpose, so treat the reading as a strong hint. The audio spectrum check draws the picture.
Is my file uploaded?
Not to convert it. Your browser opens and converts the file on this device, and Solipsium's check of a spoken recording runs in your browser too. Audio is sent only if you press Repair the first 20 seconds. Then only the recording's first 20 seconds leave this browser; Solipsium repairs them on its server and deletes them within an hour.
Hard to hear the voice?
Drop a spoken recording on the background noise page. The check runs in your browser, and you can hear its first 20 seconds repaired.
Check a recording
The check and the 20-second try need no account.