Signal vs WhatsApp vs Telegram: Which Is More Secure?

Signal encrypts every message by default and collects almost no metadata, WhatsApp encrypts every message by default but is owned by Meta and shares more account metadata, and Telegram only encrypts one-on-one "Secret Chats" — its default Cloud Chats sit decrypted on Telegram's servers. If privacy is the deciding factor, Signal wins; if you need the biggest contact list and the most polish, WhatsApp wins; Telegram wins on large communities and file-sharing but loses on encryption-by-default. Here's how the three apps actually compare on security, pricing and features heading into the end of 2026.

How encryption actually works on each app

All three apps say they protect your messages, but "encrypted" means different things depending on which one you're using.

Signal end-to-end encrypts every message, call, and group chat by default, using the open-source Signal Protocol it built and has never charged other companies to license. There's no setting to turn encryption off and no "regular chat" mode that skips it — every conversation on Signal is protected the same way.

WhatsApp also end-to-end encrypts every personal chat and call by default. It licenses the same underlying Signal Protocol, so the cryptography of an individual WhatsApp message is comparable to Signal's. The difference isn't the math — it's who owns the app, what else that company sees, and whether anything around the message is encrypted too.

Telegram is the outlier. Its FAQ states plainly that end-to-end encryption only applies to Secret Chats — an opt-in, device-locked chat type you have to deliberately start. Regular "Cloud Chats," which is what nearly everyone uses for one-on-one messages, groups, and channels, are encrypted only in transit to Telegram's servers, where the company can technically access them. Telegram built this on its own MTProto protocol (256-bit AES, 2048-bit RSA, Diffie–Hellman key exchange) rather than the Signal Protocol, and independent reviewers who formally verified MTProto 2.0 concluded the server has to be trusted — the opposite of Signal's and WhatsApp's default-on, server-can't-read model.

Who owns each app, and why that matters

Signal is built by the nonprofit Signal Foundation and its subsidiary Signal Messenger LLC, funded by grants and donations rather than advertising or data sales. WhatsApp is owned by Meta Platforms, the same company behind Facebook and Instagram, and while WhatsApp's own security page says it can't read your personal messages, Meta's ownership means account metadata — who you talk to, when, and from where — can factor into the company's broader data practices and has drawn scrutiny over the years, including from critics such as Edward Snowden after Meta's 2021 data-sharing policy changes. Telegram Messenger Inc. is domiciled in the British Virgin Islands and operates out of Dubai, funded originally by founder Pavel Durov and later by a $1.7 billion private placement. Telegram's Cloud Chats being readable server-side means that ownership and jurisdiction matter even more for the data Telegram actually holds.

Metadata and what each company can see

Encryption only protects message content — it doesn't automatically hide metadata like who you messaged, when, and how often. Signal has long marketed minimal metadata retention as a core feature; it doesn't have your contact list or social graph the way the other two do. WhatsApp, run by Meta, collects more account and usage metadata and has reportedly responded to law enforcement data requests with account and location information. Telegram keeps your contacts "so users can message people from their existing social graph" and stores Cloud Chats — the default chat type — in its own servers across multiple data centers, splitting decryption keys from the data itself rather than keeping the content unreadable to the company entirely.

Pricing and business model compared

None of the three apps charges for core messaging, but how they make money — and what they now sell as add-ons — differs.

Signal's paid tier is the newest of the three: the nonprofit began rolling out opt-in, end-to-end encrypted Secure Backups in September 2025, starting with Android beta and extending to iOS and desktop. A 64-character recovery key is generated on-device and never sent to Signal's servers — lose it, and the backup is permanently unrecoverable, even by Signal. The free tier covers all of your text messages plus 45 days of media; the paid tier adds full media history up to 100 GB.

Groups, channels and everyday features

If you regularly coordinate large groups or broadcast to an audience, the apps diverge sharply in scale. Signal caps group text chats around 1,000 members and group calls at 75 participants — intentionally conservative, in keeping with its minimal-metadata design. WhatsApp supports groups up to roughly 1,024 members. Telegram is built for scale: groups support up to 200,000 members, and channels can broadcast to an unlimited number of subscribers, which is why it's popular for communities, news distribution, and file-sharing — none of which benefit from end-to-end encryption anyway, since they're public by nature.

Disappearing messages exist on all three. Signal's timers run from five seconds to one week, starting once each recipient reads the message. WhatsApp and Telegram both offer similar self-destruct timers, though Telegram's only apply fully inside Secret Chats.

What's new on each app heading into late 2026

All three services have shipped privacy-relevant changes this year:

• Signal finished rolling its Secure Backups feature out from Android beta to iOS and desktop through late 2025 and into 2026, and continues building toward full cross-platform encrypted backup and restore.
• WhatsApp opened reservations for usernames in June 2026, letting people message each other without exposing a phone number — a feature Signal has offered since February 2024 via its own phone number privacy and usernames system. WhatsApp says there's no public username directory and the rollout is gradual by country. WhatsApp also launched WhatsApp Plus, a paid cosmetic add-on, in 2026 — it does not touch the app's encryption or core privacy settings.
• Telegram passed 1 billion monthly active users in March 2025, according to founder Pavel Durov, and has continued expanding Telegram Premium perks, but its default encryption model for Cloud Chats hasn't changed.

Open source code and independent auditability

How much of each app can outside researchers actually verify? Signal's mobile clients, desktop client, and server code are released under the AGPL-3.0 license — the protocol, the apps, and most of the backend are open for inspection, with only Signal's anti-spam component kept proprietary. That transparency is a big reason security researchers treat Signal's claims as independently checkable rather than taking the company's word for it.

Telegram publishes its client app source code too — the FAQ states "all Telegram client apps are fully open source" — but its server code is not published. Telegram's position is that publishing server code wouldn't provide meaningful security guarantees on its own, and that the cryptography it uses is "fully documented and open for review" even if the server implementation isn't. Independent researchers who formally verified the MTProto 2.0 protocol in a 2020 academic study were able to confirm the cryptographic design but still had to treat Telegram's server as a trusted party, since Cloud Chats pass through it unencrypted at rest.

WhatsApp sits in between. It licenses the open-source Signal Protocol for its encryption layer, and Meta has published technical white papers describing both the messaging encryption and the design of its end-to-end encrypted backup system, including a hardware-secured "Backup Key Vault" that Meta says even WhatsApp itself cannot read. But WhatsApp's client and server source code is not open for public review the way Signal's or Telegram's clients are, so claims about what the app does with metadata ultimately rely on Meta's own documentation rather than independently auditable code.

Voice calls, video calls, and multi-device support

Encryption guarantees for calls generally mirror each app's messaging defaults. Signal end-to-end encrypts every voice and video call, including group calls, with no separate setting required. WhatsApp likewise end-to-end encrypts calls by default as part of the same Signal Protocol-based system it uses for messages. Telegram encrypts one-on-one voice and video calls end-to-end, but — consistent with its Cloud Chat model — group voice chats and Telegram's live-streaming features aren't held to the same client-to-client encryption standard as Secret Chats.

All three now support using the app across multiple devices without keeping a phone constantly connected, a feature that used to be a real differentiator but has largely converged. Signal and WhatsApp both support linked desktop and tablet clients tied to your phone number or account; Telegram's cloud-based architecture was actually built around multi-device sync from early on, since Cloud Chats live on Telegram's servers rather than solely on your device — convenient, but another reminder that the convenience and the "server can read it" tradeoff are the same decision.

Where each app falls short

Signal's biggest limitation isn't security — it's reach. Fewer of your contacts are likely already on it compared to WhatsApp, and its feature set (stickers, payments, business tools) is intentionally minimal. WhatsApp's weak point is trust in its parent company: Meta's ownership and broader advertising business mean metadata and account data practices get more scrutiny than Signal's, even though message content itself is end-to-end encrypted. Telegram's weak point is the one many users don't realize exists: the chats you're actually using by default aren't end-to-end encrypted at all, and a 2020 academic review of MTProto 2.0 concluded Telegram's server has to be trusted rather than verified, with researchers noting that older protocol versions had let the company's servers silently alter keys in Secret Chats.

Which should you choose?

Choose Signal if message privacy is the priority and you're not locked into needing everyone else's phone number already on another app — it's the only one of the three with end-to-end encryption, minimal metadata, and a nonprofit structure all in one package. Choose WhatsApp if you need the broadest possible reach with strong default encryption and don't mind Meta's ownership — for most casual users messaging friends and family, it's the most practical pick. Choose Telegram if you need large group broadcasting, big file transfers, or public channels, but treat its default Cloud Chats as you would an unencrypted text message, and manually start a Secret Chat for anything you don't want Telegram's servers to see.

If you're building out a broader privacy stack, pairing an encrypted messenger with a password manager comparison like 1Password vs Bitwarden or a VPN choice such as NordVPN vs Proton VPN covers more of your digital footprint than messaging alone. For cloud storage privacy specifically, see how Proton Drive compares to Google Drive.

Written bySana Qureshi

Sana Qureshi runs the security and privacy desk. She reports on actively exploited vulnerabilities, vendor patches and data breaches, and covers the password managers, VPNs and authentication tools readers use to protect themselves. Her alerts cite vendor advisories, CISA and the CVE record directly.

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