Every converter here is free, full size, no account.Photos convert in your browser and never leave it. Video and e-books do need our server — those we delete right after.
By ShinobiTools Team · Last updated: August 2026
A recording that is too quiet to hear, or one that blows your ears off. Pick how much and get the same file back at a different level — MP3 in, MP3 out. Works on video too. No account, no watermark.
Decibels are not percentages. +6 dB is about twice as loud, +10 dB is roughly three times, and +3 dB is a clear but modest lift. Downwards it is the mirror image: −6 dB is half as loud.
So start with +6. If it is still too quiet, run it again rather than jumping straight to +20 — see the next section for why.
Turning up multiplies every sample, including the loud ones. Push far enough and the peaks run off the top of the scale and get flattened, which is the crackly, distorted sound you cannot undo afterwards. A recording that is quiet because it was recorded quietly has room to go up; one that is already peaking does not.
If the problem is that the quiet parts are too quiet and the loud parts are fine, this is the wrong tool — you want evening out the volume instead, which brings the whole recording to a standard level without flattening anything.
Drop in an MP3 and you get an MP3; drop in a video and you get the video back with the picture untouched and only the sound changed. The picture is copied across without re-encoding, so nothing is lost there.
This one runs on our own machine, not in your browser — the standing exception for the audio and video tools here. Your file is deleted the moment the result is ready. Limit: 400 MB per upload.
Want the level to ease in or out instead of a flat change? Fade audio does that. Need it gone entirely rather than adjusted? Remove audio from video strips the track out.
Drop it in, pick +6 dB for about twice as loud, and download. You get an MP3 back, not a different format.
+6 dB is roughly twice as loud, +3 dB is a modest lift, +10 dB is a lot. Start at +6 and run it again if you need more.
Yes. The negative options go down: −6 dB is half as loud.
The peaks ran off the top of the scale and were flattened. That cannot be undone — start from the original and add less, or use even out the volume instead.
Yes. The picture is copied across untouched and only the sound is changed.
Neither. Nothing is added to the file and there is nothing to sign up for.