Telegram vs Signal: A Complete Privacy and Feature Comparison

Signal applies end-to-end encryption (E2EE) by default to all communications, including 1:1 messages, group chats, and voice or video calls. This means that only the sender and the intended recipient can read the messages; not even Signal can access the content. Signal's encryption protocol is fully open source and widely respected in the security community.

Telegram takes a different approach. By default, standard Telegram chats utilize client-server encryption using their custom MTProto protocol. While this protects your data from being intercepted over the network, the encryption keys are held on Telegram's servers. To achieve end-to-end encryption on Telegram, users must manually initiate a 'Secret Chat,' which is restricted to 1:1 conversations and does not sync across devices. However, Telegram does offer E2EE for voice and video calls, including group calls.

Metadata—the data about who you talk to, when, and from where—is a critical privacy factor. Signal is operated by a non-profit foundation and is designed to store virtually no metadata. When compelled by legal requests, Signal can typically only produce the date an account was created and the date it last connected to the service.

Telegram's privacy policy outlines a broader approach to data collection. To manage its massive user base and combat spam, Telegram may collect metadata such as IP addresses and device information, retaining it for up to 12 months. Furthermore, Telegram's policy explicitly states that if they receive a valid court order confirming a user is a suspect in a criminal case, they may disclose the user's IP address and phone number to judicial authorities.

For large communities, Telegram supports groups of up to 200,000 members, while Signal groups are limited to 1,000. That size difference makes Telegram the stronger fit when community scale is the deciding requirement.

Signal groups are limited to 1,000 members. Signal applies end-to-end encryption by default to group chats as well as one-to-one messages and calls. This makes it a stronger fit when default encrypted group communication matters more than Telegram's larger group capacity.

Both apps require a valid phone number to register an account. Historically, Signal required you to share your phone number with anyone you wanted to message. However, Signal recently introduced a username feature, allowing users to connect without revealing their phone number to non-contacts. Telegram has long supported usernames, enabling users to keep their phone numbers hidden while participating in large public groups.

Signal's client applications and encryption protocol are open source. Its documented design applies end-to-end encryption by default to messages, calls, and group chats, so users do not need to switch to a separate mode for those conversations. These properties support Signal's default privacy model, but they do not make any messenger risk-free.

Telegram uses its custom MTProto protocol. A Royal Holloway and ETH Zurich study identified specific weaknesses in MTProto; Telegram issued client fixes, and the researchers assessed the immediate practical risk to most users as low. The study is evidence about those findings, not proof that every Telegram conversation is insecure, and its conclusions should be read in the context of the patched versions.

When it comes to user experience, Telegram is widely regarded as one of the most polished and feature-rich messaging applications available. Because it operates on a cloud-based architecture, your messages, media, and files are synchronized instantly across all your devices. You can start a conversation on your smartphone, continue it on a native desktop application, and finish it via Telegram Web in a browser without missing a beat. Telegram supports sharing massive files up to 2 GB each, offers an extensive library of animated stickers and GIFs, and provides robust tools for group administrators to manage large communities effectively.

Signal's user experience is intentionally streamlined to prioritize security over superfluous features. While Signal does offer desktop applications for Windows, macOS, and Linux, these act as linked devices that depend on your primary mobile phone registration. Notably, Signal does not offer a web browser client, reducing the potential attack surface but sacrificing some convenience. Signal includes essential features like voice messages, media sharing, and reactions, but it lacks the expansive customization options, broadcast channels, and massive file-sharing capabilities found in Telegram. For users who value simplicity and peace of mind, Signal's clean interface is a significant advantage.

Signal applies end-to-end encryption by default to its conversations and offers disappearing-message settings. A timer can reduce how long content remains visible in the app, but it cannot prevent a recipient from photographing, copying, or otherwise preserving what they can see. Treat disappearing messages as retention controls, not a guarantee that every copy is erased.

Telegram offers end-to-end encryption for one-to-one Secret Chats, where users can set self-destruct timers for messages and media. Standard group chats do not use this Secret Chat mode. Timers can reduce retention in Telegram clients, but screenshot and out-of-band capture limits mean they should not be treated as proof that no copy remains.

Signal is operated by a nonprofit foundation, and its data-minimization design means the service typically records only limited account metadata, such as the account-creation date and last connection time. Its published legal responses are consistent with that limited retention. What a provider can produce depends on what it stores and the applicable request, so this is a documented data-retention distinction rather than a promise of immunity from legal process.

Telegram's stance on law enforcement cooperation is distinctly different, reflecting its role as a massive public broadcasting platform. According to Telegram's privacy policy, the company may collect and retain metadata, including IP addresses and device information, for up to twelve months to combat spam and abuse. Furthermore, the policy explicitly notes that if Telegram receives a valid order from judicial authorities confirming a user is a suspect in a criminal case involving violations of their Terms of Service, the company may disclose the user's IP address and phone number. While Telegram asserts it protects private conversations, its retention of metadata and willingness to comply with specific legal orders highlight the trade-offs of its cloud-based model.

Choosing between Telegram and Signal depends on your needs and threat model. If you prioritize end-to-end encryption for messages and calls by default and minimizing service-held metadata, Signal is generally the stronger fit. Its documented design applies end-to-end encryption by default and typically retains only limited account metadata. Signal's username feature also lets people connect without sharing a phone number.

If your priority is large communities and seamless multi-device cloud synchronization, Telegram is generally the stronger fit. It supports groups of up to 200,000 members and keeps cloud chats synchronized across devices. Standard Telegram chats are not end-to-end encrypted by default, so this convenience uses a different privacy model from Signal. Choose based on whether community scale and synchronization or default private-chat protections matter more to your task.