By ShinobiTools Team · Last updated: August 2026
If your recording has a hissing, sissing background — mic self-noise, static, room hiss — CleanGrab pulls that out for free. If the hiss is sharp S and T sounds in the voice itself, read on before you upload.
"Sibilance" gets used for two different problems, and CleanGrab only fixes one of them. We measured this directly rather than guessing: we fed a clean speech recording through CleanGrab and compared the sibilant band (4-9 kHz, where S and T sounds live) against the total signal, before and after. It came back at -7.3 dB both times — completely unchanged. CleanGrab removes hissing background noise (mic self-noise, static, a noisy room), but it does not touch sharp S/T peaks that are already baked into the voice itself. If your recording sounds harsh every time you say an S, that is vocal sibilance, and no background-noise tool fixes it — including this one. We'd rather say that plainly than sell it as a de-esser.
The background half of the problem — a hissing, sizzling noise floor sitting under the whole recording — is ordinary background hiss, and our model removes it the same way it removes hum: mic self-noise, static from a badly-gained room, fan and air hiss layered underneath the voice.
That's vocal sibilance, and it comes from mic placement and EQ, not background noise, so a background-noise tool — any of them, not just this one — can't remove it without damaging the voice. Two things that actually work:
Do that first, then bring the file here if there's still hiss or hum sitting behind it — the two problems stack, and fixing one doesn't fix the other.
CleanGrab is tuned for voice and speech — podcasts, interviews, calls, voice memos, lectures. On music or other non-speech audio the result can be poor, and the tool will tell you when it couldn't detect clear speech instead of handing you a mangled file.
Steady buzz instead of hiss? See removing hum and hiss. Clothing or cable noise? See removing fabric rustling noise.
No — a de-esser targets sharp S/T peaks in the voice itself, and CleanGrab doesn't touch those (we measured no change in the 4-9 kHz band on a clean test recording). CleanGrab removes background hiss and static instead. For true vocal sibilance, use a dedicated de-esser or move the mic.
Because that harshness is in the voice itself, not the background, so removing background noise doesn't change it. Pull the mic back slightly and off-axis, or run a de-esser plugin — see above.
Hiss is a steady background noise floor (mic self-noise, static, room noise) that sits under the whole recording regardless of what's being said. Sibilance is loud only on S and T sounds, because it's part of the voice. CleanGrab removes the first, not the second.
Yes — cleaning the background hiss first often makes the recording sound much better even if the S sounds are still sharp, since the two noises were stacking on top of each other.
No. Your upload is deleted the moment it's processed and the cleaned file is wiped from the server within 45 minutes. Nothing is stored, shared or used to train anything — see privacy.