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About Threema. Secure and private Messenger

Threema is the world’s best-selling secure messenger and keeps your data out of the hands of hackers corporations and governments. Threema can be used completely anonymously allows to make end-to-end encrypted voice and video calls and offers every feature one would expect from a state-of-the-art instant messenger. With Threema Web you can also use Threema from your Desktop.

PRIVACY AND ANONYMITY
Threema is designed from the ground up to generate as little data on servers as possible. Group memberships and contact lists are managed on your device only and never stored on our servers. Messages are immediately deleted after they have been delivered. Local files are stored encrypted on your mobile phone or tablet. All this effectively prevents the collection and misuse of your personal information, including metadata. Threema is fully compliant with the European privacy legislation (GDPR).

HIGHEST ENCRYPTION STRENGTH
Threema end-to-end encrypts all your communication including messages, voice and video calls, group chats, files and even status messages. Only the intended recipient, and nobody else, can read your messages. Threema uses the trusted open source NaCl cryptography library for encryption. The encryption keys are generated and safely stored on users’ devices to prevent backdoor access or copies.

COMPREHENSIVE FEATURES
Threema is not only an encrypted and private messenger but also versatile and feature-rich.

• Write text and send voice messages
• Make voice and video calls
• Share videos pictures and locations
• Send any type of file (pdf animated gif, mp3, doc, zip, etc.)
• Use Threema Web to chat from your Desktop
• Create groups
• Conduct polls with the poll feature
• Choose between a dark and a light theme
• Quickly and silently reply with the unique agree/disagree feature
• Verify the identity of a contact by scanning their personal QR code
• Use Threema as anonymous instant messaging tool
• Synchronize your contacts (optional)

SERVERS IN SWITZERLAND
All our servers are located in Switzerland and we develop our software in-house.

FULL ANONYMITY
Each Threema user receives a random Threema ID for identification. A phone number or email address is not required to use Threema. This unique feature allows you to use Threema completely anonymously – no need to give up private information or to open an account.

TRUSTED CONTACTS
We let users confirm trusted contacts with a QR code or a key fingerprint to prevent man in the middle attacks.

NO ADS NO TRACKERS
Threema is not financed by advertising and does not collect user data.

SUPPORT / CONTACT
For questions or problems please consult our FAQs: https://threema.ch/en/faq

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Frequently Asked Questions(FAQ)

What is Threema?

Threema is a secure and private messenger that keeps your data protected from hackers, corporations, and governments.

How does Threema ensure privacy and anonymity?

Threema generates as little data as possible on servers, manages group memberships and contact lists on your device only, and immediately deletes messages after delivery. It also encrypts all communication and complies with European privacy legislation.

What encryption strength does Threema use?

Threema uses end-to-end encryption for messages, voice and video calls, group chats, files, and status messages. It employs the trusted open source NaCl cryptography library for encryption.

What features does Threema offer?

Threema offers various features including text and voice messaging, voice and video calls, file sharing, Threema Web for desktop use, group creation, polls, dark/light themes, quick replies, contact verification with QR codes, and optional contact synchronization.

Where are Threema servers located?

Threema servers are located in Switzerland and the software is developed in-house.

Can Threema be used anonymously?

Yes, Threema allows complete anonymity as it assigns random Threema IDs to users, eliminating the need for phone numbers or email addresses.

How does Threema handle trusted contacts?

Threema lets users confirm trusted contacts using QR codes or key fingerprints to prevent man-in-the-middle attacks.

Does Threema have ads or trackers?

No, Threema is not financed by advertising and does not collect user data.

How can I get support or contact Threema?

For any questions or problems, please consult Threema's FAQs on their website: https://threema.ch/en/faq
author
Super impressed with this app. I love that it is secure and doesnt require personal info. It has good emojis and i can send audios easily. I can do everythingnon here!
Brie
author
Excellent app in everything!
AGNA KALA
author
One of the best tried so far. Wish it had multiple-device synching feature. Also would like to see tablet balanced. Worth the payment.
David L
author
Best security ever!
Niaz Mehedi
author
One of the great features are the phone calls great quality and sound, even better than land line. I recommend 200%. And mine does not allow me to do screenshots which is even better
Jimmy Marin
author
Used for 2 years (better than WhatsApp which is now state crime spyware) . No problems at all so far.
A C