Versatile Features, No Gimmicks

Threema is easy to use, provides versatile features, and avoids useless gimmicks.

Text and Voice Messages

Quickly and conveniently send text messages. If you don’t have the time to type, voice messages come in handy.

Groups and Distribution Lists

Groups and distribution lists allow to send messages to multiple recipients at once. Groups are managed in a strictly decentralized manner. Except the group members themselves, no one - not even Threema – knows who is member of a group.

Mehr erfahren

Threema Web: Conveniently Chat from the Desktop

Thanks to Threema Web, chatting from the desktop is just as secure as using the Threema app on your phone. You have full access to your entire chat history as well as all contacts and media files. Threema Web is open source.

Learn more Open Threema Web
  • Files
    • MP3s
    • Animated GIFs
    • Office Documents
    • PDFs
  • Locations
  • Images and Videos

Share Files, Media, and Locations

Use Threema to send any type of file. Just like text messages, files are end-to-end encrypted, of course.

Handy Poll Feature

Create polls in no time to gather the other group members’ opinions in an efficient manner.

Learn more

Voice and Video Calls

Place calls without revealing your phone number. Threema calls are end-to-end encrypted and thus tap-proof. They impress with crystal-clear voice quality and brilliant video quality.

Learn more

Other Features

Private Chats

Hide particularly sensitive chats, and lock them with a PIN or your fingerprint.

Agree/Disagree

Use the agree/disagree feature to communicate without triggering a push notification on the recipient’s end.

Light and Dark Theme

Select the theme of your liking: light or dark.

Optimized for Tablets

Use Threema on tablets and devices without a SIM card.

Text Formatting

Make your text messages stand out by adding typographical emphasis: *bold*, _italic_, and ~strikethrough~

Contact Verification

Verify contacts using their QR code to protect yourself against man-in-the-middle attacks.

Chat Anonymously

Chat completely anonymously. There is no need to provide a phone number.

Quote Feature

Quote text messages to unambiguously reference what was said earlier.

Optional Contact Synchronization

It’s up to you whether you want to enable contact synchronization or not. No address-book access is required.

Features

Threema allows to create a poll right inside a chat. No need to write back and forth when considering several options – initiate a poll with a few taps, and get a useful overview of the received votes.

  • Android: In a chat, tap the paperclip icon, and select “Poll”.
  • iOS: In a chat, tap the plus sign next to the text-input field, and select “Create Poll”.

Check out the promo video.

The agree/disagree feature allows to agree or disagree with an incoming message without triggering a push notification on the chat partner’s device, providing an unobtrusive way of expressing your attitude toward a message.
  • In a single chat, tap and hold on a received message to invoke the context menu.
  • To agree or disagree with the selected message, tap “agree / thumbs up” or “disagree / thumbs down”, respectively.
The agree/disagree feature is not supported in group chats.
With Private Chats, you can protect individual chats with a PIN code. Furthermore, these chats can be hidden from the chat list. This way, confidential chats are protected from prying eyes. Push notifications for new messages in a private chat contain no message preview.

On Android, set a PIN or enable Android’s Lock Screen (Android 6.0 and above) in Threema’s security settings. On iOS, Private Chats are currently not available.

To mark a chat as private, long-tap on the chat, and select “Hide chat”. When attempting to access the chat, you will be prompted to enter your PIN.

To hide all private chats, tap on the menu icon in the chat list, and choose “Hide private chats”. To show all hidden chats, choose “Show hidden chats” in the chat list’s menu, and enter the PIN.

In Threema, text can be formatted bold, italic, and crossed out. To format text, simply enclose it in the appropriate character:

  • *bold*
  • _italic_
  • ~strikethrough~

This FAQ article covers the QR code that can be displayed in the app (and is used to confirm a contact’s identity and add their Threema ID at the same time; green verification level), not to be confused with the QR code on threema.id websites (which can only be used to add contacts; red verification level).

Scanning QR codes is a means for confirming contacts' identities. That way, man-in-the-middle attacks can be effectively prevented: If you receive a message of a confirmed contact (i.e., verification level 3), you can be sure that it wasn't spoofed or read by a third party (provided said contact's device wasn't stolen or hacked). On top of that, scanning someone's QR code is a convenient way of adding them to your contact list without having to manually enter their ID.

Display your own QR code

  • Android: Navigate to the “My Profile” tab, and tap on the QR code icon
  • iOS: Navigate to the “My Profile” tab, and tap on the QR code

Scan a contact’s QR code

  • Android: In the Contacts tab, tap the “New contact” button, and select “Scan ID”
  • iOS: Threema > My ID > camera icon in the top right corner

If you are having trouble scanning a QR code, please make sure the camera is not too close (below 10 in/25 cm), which might prevent it from focussing.

Please note: The QR code of contacts should not be confused with the QR code of ID exports and the QR code used to connect to Threema Web.

Yes. In contrast to other messengers, your identity in Threema isn't tied to a phone number (cf. What is a Threema ID?). Hence, you can use Threema without any limitation on a device that doesn’t have a SIM card slot (cf. Supported Devices).

To save a chat outside of Threema, you can export it as encrypted ZIP archive (which will contain the chat as text file and, optionally, all media files). Please note that exported chats cannot be imported into Threema again; to transfer your chats to another device (or to restore them later on the current device), use a data backup

  • Android: In the chat list, tap and hold a chat, and then tap the “Share” button. You can save or send the chat as an encrypted ZIP file using your installed apps.
  • iOS: In a contact’s or a chat’s detail view, tap “Export Conversation”. Please note that the chat export cannot exceed a file size of 100 MB. If necessary, old media files will be skipped at a certain point.

Chat exports are encrypted using the Advanced Encryption Standard (AES). Therefore, a modern file archiver, such as The Unarchiver for macOS or 7-Zip for Windows, is required to unpack a chat export. Some other apps don’t recognize the encryption and return an error message stating that the provided password is incorrect (even though you have entered the password correctly).

Use Threema to send files of any type (PDF, animated GIF, MP3, DOC, ZIP, etc.). Just like all other messages, files are end-to-end encrypted. The maximum file size is 50 MB (it might, however, not be possible to send large files on older devices due to insufficient memory). To avoid compression of an image or video, you can send it as file. Please note: If you send an image as file, its EXIF tags (possibly containing information such as the date and location the image was taken) are preserved.

Android: In a chat, tap on the paperclip icon, and select “File”.

iOS: In a chat, tap on the “+”, and select “Share File”. Due to restrictions of iOS regarding the file system, you can only access content of apps that support file sharing.

Threema is available in a light and a dark theme. You can switch between the two themes here:

Settings > Appearance > Design theme

To quote a text message, tap and hold it until the context menu appears. There, tap the quotation mark icon, and the quoted message will show up above the text input field. (On Android, you can also swipe right to quote a message.) You can then compose and send your message like you usually would. In the chat, the quoted message is indented and prepended to your new message so that it’s evident what you are referring to.

It’s not possible to set up a Threema ID on multiple devices at the same time. You can, however, use Threema Web to connect to the device on which your Threema ID is set up.

The only way to use Threema simultaneously on multiple devices is to set up different Threema IDs on each device and create groups containing those IDs as well as the desired chat partner’s ID. Learn more…

If there are unresolved issues in a chat, you can use the “pin” feature to create a visual reminder. Pinned chats always stay on top of the chat list and are marked with a yellow bar. On Android, there is also a pin icon displayed:

  • Android/iOS: In the chat overview, swipe from left to right on a chat to (un)pin it
  • Threema Web: Open the desired chat, and tap the pin icon in the top right corner to (un)pin it

Chats can only be archived in Threema for Android at the moment.

In the chat overview, swipe from right to left on a chat to archive it. The chat will be removed from the chat overview, but not deleted.

To access your archived chats, scroll to the end of the chat overview, and tap the “X archived chats” button.

In order to move an archived chat from the archive back to the chat overview, tap and hold the chat until the action icons appear in the title bar. There, tap the icon next to the trash-bin icon.

To share your current location, open a chat, tap on the paperclip icon (Android) or the plus sign (iOS), and select “Location” (Android) or “Share Location” (iOS).