Give any song deeper, punchier bass. Set how much to boost and from which frequency, flip between the original and the boosted version while it plays, and let the built-in limiter keep it clean before you download the MP3 or WAV.
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Your song's waveform appears here
0:00 / 0:00
Limiter: idle
EQ curve
Presets
Choose a song or play the demo beat to start.
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How to use the Bass Booster
Choose a song: drop an MP3, WAV, M4A, OGG or FLAC file on the box, or press Play a demo beat.
Pick a preset or set the Bass boost and Cutoff frequency sliders.
Press Play preview and switch between A · Original and B · Boosted to compare.
Keep the limiter on to avoid distortion, and lower Output volume if the limiter works hard.
Choose MP3 or WAV, press Create bass boosted MP3 and download the file.
Which frequencies are "bass"?
Range
Frequencies
What you hear
Suggested cutoff
Sub-bass
20 to 60 Hz
Rumble and pressure you feel, 808 tails, film effects. Small speakers cannot play it.
50 to 70 Hz
Bass
60 to 250 Hz
The body of bass guitars and kick drums, warmth of male voices
90 to 130 Hz
Low mids
250 to 500 Hz
Fullness, but too much sounds muddy or boxy
Avoid boosting
A low-shelf filter at 110 Hz with +8 dB raises 40 Hz by close to the full 8 dB, 110 Hz by about 4 dB (half the boost in decibels), and leaves 400 Hz and above essentially unchanged, so vocals and cymbals stay clear.
Decibels of boost and what they mean
Gain in decibels relates to amplitude by amplitude ratio = 10dB ÷ 20 and to power by 10dB ÷ 10:
Boost
Amplitude
Power
Typical result
+3 dB
1.41×
2×
Just noticeably warmer
+6 dB
2×
4×
Clearly fuller bass
+10 dB
3.16×
10×
Heavy, "bass boosted" sound
+18 dB
7.9×
63×
Extreme, deliberately distorted meme style when the limiter is off
Tips for clean, powerful bass
Compare at equal loudness. Lower Output volume by a few dB while listening to B so the boosted version is not just louder.
Watch the limiter readout. Up to about −3 dB is transparent; −6 dB or more flattens the punch, so lower the boost or the output volume.
Match the cutoff to the playback system. Phones and laptops benefit from 120 to 160 Hz; cars, subwoofers and headphones can use 50 to 90 Hz.
Export WAV if you will edit further, or MP3 320 kbps for the best quality sharing copy.
Frequently asked questions
How does the bass booster work?
It applies a low-shelf equalizer: every frequency below the cutoff is raised by the boost amount, with a smooth transition around the cutoff where the boost is half as strong. A high-pass filter can remove inaudible rumble below 25 Hz, and a limiter catches the extra peaks before the file is saved.
What settings give the best bass boost?
For most music +6 to +10 dB below 100 to 120 Hz sounds full without mud. Use a lower cutoff (50 to 70 Hz) for sub-bass you feel rather than hear, and a higher one (140 to 160 Hz) for punchier kick drums. Above +12 dB the limiter has to work hard and the song gets louder but less dynamic.
Why do I need the limiter?
Raising the bass by 10 dB makes low notes about three times larger in amplitude, so peaks that were close to full scale would go past 0 dBFS and clip with harsh distortion. The limiter turns those peaks down instantly; its readout shows how many decibels it is removing.
Why does the boosted version sound louder?
More bass adds energy, so the boosted version is louder overall, and louder usually sounds better. For a fair A/B comparison lower Output volume until both versions feel equally loud.
Will bass boosting damage my speakers?
Extreme boosts at high volume can overdrive small speakers and earbuds, which have little real output below 60 to 80 Hz. Keep the rumble filter on, avoid cranking the playback volume, and use moderate boosts for laptop and phone speakers.
Can I bass boost a video's audio?
Yes, you can add a video file and the tool will process its soundtrack, but the result is an audio file (MP3 or WAV). To put the boosted audio back into the video, use a tool that adds audio to video.
Is my music uploaded?
No. Decoding, EQ, limiting and MP3 encoding all run in your browser, so your files stay on your device.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.