Bass Booster Online - Boost Bass Up to +18 dB

This bass booster adds up to 18 dB of bass to a song, and the song stays loud instead of getting quieter. You hear the boost live against the original, then download the result free, with no upload and no signup.

How to Boost the Bass in a Song in 3 Steps

1. Add your file. Drag a song, voice memo or video into the "Select Audio" box, or press it to browse. A player appears under "Your song or recording" with "Play", a position bar and an "Original | Boosted" switch. "Remove" lets you swap the file.
2. Add bass. Under "Add bass", move the "Bass amount" slider from 0 to +18 dB (it starts at +8). Then pick a "Bass type" button: "Deep", "Punchy" or "Extreme".
3. Save it. Under "Save the boosted file", pick "MP3" or "WAV" as the "File type", press "Boost bass", then press "Download".

The first time you press a button, the sound engine has to load, so that first wait is longer. After that it is quick, and the page tells you while it loads.

Deep, Punchy or Extreme: Which Bass Fits Your Speakers?

Pick the bass type that matches what you listen on, because many bass boosts sound weak on a phone. Small speakers and most earbuds cannot play sub bass, the very low rumble you feel more than hear.

Hz tells you how many times a sound wave repeats each second, and sounds below about 80 Hz are sub bass. A phone or laptop speaker cannot play them at all, so a boost down there does almost nothing on those devices.

If you are not sure, start with "Punchy", which lifts the part of the bass that small speakers can actually play.

Why the Song Stays Loud

Adding bass normally forces a choice between turning the song down and letting it crackle. The crackle is called clipping, and it happens when the loudest parts of a song are pushed past the limit.

The usual fix is to turn the whole song down to make room, which keeps it clean but makes it quieter. This tool takes the other route, and so does our equalizer page when you want to shape the whole tone with the equalizer.

This tool does not turn the song down. Instead, peaks above 80 percent of the maximum are rounded off smoothly toward the limit, and nothing below 80 percent is touched. The preview and the download use the very same rounding curve, so what you hear is what you get.

We tested it with a 60 Hz tone at 70 percent of full scale, boosted by +18 dB. For all three bass types the peaks landed exactly at the limit with no overshoot. The tone came out 4 to 6 dB louder than the original: Deep +5.4 dB, Punchy +4.4 dB, Extreme +5.7 dB.

There is a trade-off, because the peaks are being rounded. Push the slider high on a song that is already loud and you will hear some grit in the bass, even with "Deep" or "Punchy". That is the price of staying loud, so lower the slider a little if the grit bothers you.

How Much Bass Should You Add?

For most songs, start at the default of +8 dB. These are suggestions, not promises, because every song and every speaker is different.

• +4 to +6 dB is a gentle lift.
• +8 dB is a clear boost that most songs take well.
• +12 dB is heavy.
• +18 dB is as far as the slider goes.

The quickest way to choose is to press "Play" and flip "Original | Boosted" while you move the slider. Stop at the point where the bass feels full but the words and drums still sound clear.

Make a Bass Boosted Version of a Song

Press "Extreme" to get the heavy sound people call "bass boosted", the style you hear in bass boosted versions of songs on YouTube. It raises everything below 100 Hz by the slider amount plus 6 dB more.

Then it squashes the sound hard on purpose, by starting the rounding at 30 percent of the maximum instead of 80 percent. Extreme is overdriven by design and sounds gritty, so flip back to "Original" now and then to hear how far you have gone.

Hear It Live Before You Save

Press "Play" and use the "Original | Boosted" switch to compare the two sounds before you download anything. The switch flips between them while the song keeps playing.

The file streams through the browser's own filters while it plays, so the whole song is never loaded into memory. Long files and phones are fine.

For a rare format that the browser cannot play, such as AVI, the page says live preview is off. "Boost bass" still works, so you can save the file and listen to the result.

Download as MP3 or WAV

Choose "MP3" for a small file or "WAV" for an uncompressed one. An MP3 keeps the quality of your original by matching the closest standard rate of 128, 192, 256 or 320 kbps. Kbps is how much sound data is used for each second of audio, and a 192 kbps file came out at 192 kbps.

WAV is uncompressed, so the file is bigger. If you end up with a large WAV, you can make the file smaller. If you still want more overall volume after boosting, you can make the whole file louder.

On our test computer, boosting 10 to 20 seconds of audio took about half a second once the engine had loaded. The download matches the curve you set: a +8 dB "Deep" boost measured within 0.01 dB of it, and "Punchy" within 0.05 dB.

The page reads MP3, WAV, M4A, AAC, OGG, FLAC and OPUS, plus video files such as MP4, MKV, WEBM, MOV and AVI. Only the sound of a video is used, and the download is always an audio file. The page remembers your amount, bass type and file type on that device.

This tool changes one file that you pick. It is not a system-wide bass boost, and it does not change other apps or the sound of your whole phone or computer.

Made in Your Browser, Nothing Uploaded

Nothing leaves your device. The file is read, played and boosted inside your browser, and the download is made there too.

Your settings are saved only in your own browser, and there is no account and no signup.

Bass Booster FAQ

Why does Deep bass sound the same on my phone?

A phone speaker cannot play sounds below about 80 Hz, and "Deep" only raises those sounds. Switch to "Punchy", which lifts a band around 120 Hz that phones and earbuds can play.

Will boosting the bass distort my song?

Peaks are rounded smoothly instead of being cut off flat, which avoids the harsh crackle of clipping. At high amounts on a loud song you can still hear some grit in the bass. Lower the slider a little if that bothers you.

What is the difference between this and the equalizer?

This page adds bass only, with three bass types chosen for your speakers. The equalizer page lets you change bass, mid and treble across ten bands, and it rounds peaks the same way.

Can I boost the bass in a video?

Yes, you can add a video such as MP4, MKV, WEBM, MOV or AVI. Only the sound is boosted, and the download is an audio file, so the picture is not kept.

Does it work on a phone?

Yes, it runs in your phone browser, and long files are fine because they stream while they play. Use "Punchy" if you plan to listen on the phone speaker or earbuds.