How to Make Silent Subliminals (and Whether You Should)

A silent subliminal is one where you cannot consciously hear the affirmations. There are two ways to make one. You can lower the voice under a background sound until it disappears, which takes two minutes and works on any device. Or you can shift the voice into very high frequencies, which is what most YouTube "silent subliminals" claim to do, but phone speakers, earbuds and compressed audio often drop those frequencies, taking the message with them.

Method 1: The quiet version (recommended)

You can make this free in your browser:

1. Open the free subliminal maker and type your goal, or pick a preset like sleep.
2. Choose a dense, steady sound. Brown noise, rain and a waterfall hide a voice best.
3. Play it once on Audible so you know exactly what the affirmations say.
4. Switch to Masked, then drag the Voice slider lower until you can no longer pick out words.
5. Set Layers to 3x or 5x. Layered voices blur into texture, so they fade into the background more smoothly than a single clear speaker.

Because you wrote the affirmations yourself, you know what is in the track, and you can turn the voice back up any time to check. Our guide on how to layer subliminals explains the layering step in more detail.

Keeping your subliminal on your phone

The browser maker stops when you close the tab. To play a quiet subliminal every night with your screen locked, use the SelfStudio app on iPhone. It saves your tracks, lets you set exactly how far under the sound the voice sits, and keeps every layer audible if you turn it up.

Save a subliminal once and replay it in one tap.

Method 2: The high-frequency version

This version comes from a 1992 US patent by Oliver Lowery, Silent subliminal presentation system. The voice modulates a high-pitched carrier tone, typically around 14,000 to 17,000 Hz, and everything below that is filtered out. It sounds like near silence, or a faint whine to people with sharp hearing. You can do it in Audacity with modulation plugins or scripting, and many online tools claim to do it in one click.

It often goes wrong in practice:

• Hearing varies. Many young people hear up to 17,000 Hz or more, while many adults stop around 14,000 or 15,000 Hz, so one file can be silent to you and an irritating whine to someone else.
• Phone speakers and many earbuds reproduce the very top of the range weakly or not at all.
• MP3s, streaming apps and video sites commonly trim the highest frequencies, so after an upload the part that carried the message may be gone.
• You cannot check what survived without decoding the track, which is also why silent subliminals from strangers deserve some caution.

Do silent subliminals work?

The research on subliminal audio in general is weak. In a well known 1991 study, people who listened to self-help tapes improved according to the label on the tape and not its content, which points to expectation rather than hidden messages. We cover that study and others in do subliminals work.

Silent tracks add another problem, since the message may never reach your ears. We see no reason to think silent works better than masked, and some reason to think it works worse. Hearing clear affirmations for one goal every day is the part you can check and adjust.

For timers and volume at night, see listening to subliminals while sleeping.