How to Bleep Out a Swear Word in a Video on iPhone
Type the words to censor and your iPhone finds and bleeps them automatically — offline, no upload. Or mark the moment by hand. Here's how.
There are two ways to bleep a swear word out of a video, and both work right on your iPhone. The fast way: type the word, let the app transcribe the audio on-device, and it finds and bleeps every occurrence automatically. The precise way: scrub to the moment and mark the range by hand. TrackBlur does both offline — the audio never leaves your phone — and there's no watermark on the export.
One thing up front: the automatic word detection is currently iOS only (for now) and needs iOS 18 or later. Android users, hang tight.
Why you'd bleep a word
Usually it's one of these:
- You caught a great clip, but someone (possibly you) swears in it, and you want it monetization-safe or family-friendly.
- Someone says a real name, an address, or a phone number that shouldn't go public.
- Your kid's first goal celebration came with commentary you'd rather not immortalize.
Re-recording isn't an option — the moment already happened. So you censor the audio instead.
The fast way: type the word, let the AI find it
This is the Censor Words feature, and it's the part that feels like magic. Instead of hunting through the timeline for every occurrence, you tell the app what to censor and it figures out where:
- Tap Audio on the toolbar and choose Mute words...
- Type the words or phrases to censor — profanity, a name, a brand, whatever.
- Pick the language spoken in the video.
- Tap Detect & Mute. The app transcribes the audio locally, finds every match, and beeps or silences each one.
You stay in control of the result: there's a Detected words list showing every match with its timestamp. Tap one to jump the playhead there and listen, toggle off anything detected by mistake, or delete a range from the timeline to restore the original sound.
Your censor list is saved across projects too, so your usual suspects only need typing once.
It understands 17 languages — English, Spanish, French, German, Portuguese, Japanese, Chinese, Polish, and more — using the same on-device speech models Apple ships with iOS.
The manual way: mark the moment yourself
If it's just one word in a short clip — or a sound rather than speech — the manual Audio Censor tool is quicker:
- Open the Audio tools and pick an effect: Beep, Mute, or Lower volume.
- Add a range at the current position on the timeline.
- Drag the handles until they line up with the exact sound.
- Preview it with Play or Loop, then export.
Which effect to pick? Beep is the classic TV-style censor and makes it obvious something was removed. Mute is subtler — the word just isn't there. Lower volume is for background noise you want softened rather than erased.
Bonus: it censors your captions too
If you add subtitles to the video, matched words get masked there as well — so f*** appears in the captions instead of the full word. Captions are generated the same way: on-device, offline.
Nothing gets uploaded
Worth spelling out: censoring speech requires transcribing your audio, and most tools do that in the cloud — meaning your raw, uncensored conversation gets sent to a server. TrackBlur runs the speech recognition on the iPhone itself. The video and its audio never leave your device.
What's free and what isn't
Honest pricing note: masking censored words in subtitles is completely free. Silencing or beeping words in the audio track is part of the Pro upgrade.
Learn more
The full tutorials cover every option:
- Censor Words — automatic detection, language support, reviewing matches.
- Audio Censor — manual ranges, beep/mute/lower volume.
- Auto Subtitles — generating and styling offline captions.
More guides like this:
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