Signal icon

8.4 199 Reviews

6.21.3 by Signal Foundation

May 24, 2023

About Signal


Advanced encryption for every chat and every call.

Millions of people use Signal every day for free and instantaneous communication anywhere in the world. Send and receive high-fidelity messages, participate in HD voice/video calls, and explore a growing set of new features that help you stay connected. Signal’s advanced privacy-preserving technology is always enabled, so you can focus on sharing the moments that matter with the people who matter to you.

• Say anything – State-of-the-art end-to-end encryption (powered by the open source Signal Protocol™) keeps your conversations secure. Privacy isn’t an optional mode — it’s just the way that Signal works. Every message, every call, every time.

• Go fast – Messages are delivered quickly and reliably, even on slow networks. Signal is optimized to operate in the most constrained environment possible.

• Feel free – Signal is a completely independent 501c3 nonprofit. Development is supported by users like you. No advertisements. No trackers. No kidding.

• Be yourself – You can use your existing phone number and address book to securely communicate with your friends.

• Speak up – Whether they live across town or across the ocean, Signal’s enhanced audio and video quality will make your friends and family feel closer.

• Whisper in the shadows – Switch to the dark theme if you refuse to see the light.

• Sound familiar – Choose custom alerts for each contact, or disable noises completely. Simon & Garfunkel wrote a hit song about it in 1964, and you can experience the sound of silence whenever you want by choosing “None” as your notification ringtone.

• Picture this – Use the built-in image editing features to sketch, crop, and flip your outgoing photos. There’s even a text tool so that you can add more words to the 1,000 that your picture is already worth.

For support, questions, or more information, please visit:

Source code:

Follow us on Twitter (@signalapp) and Instagram (@signal_app) for all of the latest updates and announcements.

What's New in the Latest Version 6.21.3

Last updated on May 24, 2023

★ We added an iconic new way to customize the look of Signal on Android 8+. Choose from a fun selection of fresh app icon options and colors to change how Signal will appear on your home screen (Signal Settings > Appearance > App icon).

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Additional APP Information

Latest Version

Request Signal Update 6.21.3

Uploaded by

ธนากร ดีแพง

Requires Android

Android 5.0+

Available on

Get Signal on Google Play

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Signal Articles

Signal FAQ

How does Signal Private Messenger work?

Signal uses end-to-end encryption to secure your messages, calls and shared media from third-party access.

Can I use Signal Private Messenger on multiple devices at once?

Yes. You can install the app on all of your devices and link them with one account for seamless messaging across platforms.

Is it possible to send large files through Signal Private Messenger?

Yes. You can share any file up to 100MB in size using this application without compromising privacy or security.

Is Signal safer than WhatsApp?

Both Signal and WhatsApp use secure encryption, but there is a certain amount of metadata that can be retained from using WhatsApp because it is owned by Meta.

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Signal Screenshots

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