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#2 WhatsApp
Widely used mobile and desktop messenger with end‑to‑end encryption and support for sending photos, videos, documents, and voice notes up to 2 GB.
#3 Telegram
Cloud‑based messenger offering fast file transfers (up to 2 GB per file), secret chats, bots, and large group channels.
#4 Signal
Privacy‑first messenger with strong end‑to‑end encryption; supports sending images, videos, PDFs, and other files up to 100 MB.
#5 Discord
Community‑focused platform with voice, video, and text chat; free tier allows file uploads up to 8 MB (or 100 MB with Nitro boost).
Collaboration hub with chat, video calls, and file sharing (10 GB per user, 2 GB per file) integrated with OneDrive.
#7 Slack (Free)
Team messaging with searchable history (10 k messages) and file sharing up to 1 GB per file.
#8 Google Chat
Integrated with Google Workspace; supports direct messages, rooms, and file sharing via Google Drive.
#9 Skype
Classic video‑calling app that also offers instant messaging and file transfers up to 300 MB per file.
#10 Viber
Cross‑platform messenger with end‑to‑end encrypted chats and file sharing up to 200 MB.
#11 Line
Popular in Asia; supports stickers, voice/video calls, and file sharing up to 1 GB per file.
#12 WeChat
All‑in‑one app for messaging, social media, and payments; file sharing up to 100 MB per file.
#13 Kik
Mobile‑first messenger with chat bots and file sharing (photos, videos, GIFs) up to 10 MB.
#14 GroupMe
Simple group chat app that allows sharing photos, videos, and documents up to 5 MB.
#15 Element (Matrix)
Open‑source, decentralized messenger with end‑to‑end encryption and unlimited file sharing (subject to server limits).
#16 Rocket.Chat
Self‑hosted open‑source chat platform; free community edition supports file uploads (default 10 MB, configurable).
#17 Mattermost
Open‑source Slack alternative; free community edition offers unlimited messaging and file sharing (default 100 MB per file).
#18 Tox
Peer‑to‑peer messenger with strong encryption; supports sending files of any size (limited by bandwidth).
#19 Wire
Secure collaboration tool with end‑to‑end encryption; free plan includes file sharing up to 25 MB per file.
#20 Jami
Decentralized, open‑source communication platform; supports encrypted file transfers of any size.
#21 Briar
Privacy‑focused messenger that works over Bluetooth, Wi‑Fi, or Tor; allows sending files up to 10 MB.
#22 Zalo
Vietnam‑centric messenger with chat, voice/video calls, and file sharing up to 100 MB.
#23 Pidgin
Multi‑protocol desktop client (supports XMPP, IRC, etc.) with plugins for file transfers.
#24 Zulip
Threaded open‑source chat; free tier includes file uploads up to 25 MB.
#25 Chatwork
Business‑oriented chat with free plan; supports file sharing up to 10 MB per file.
#26 Flock
Team messenger with unlimited messages and file sharing up to 2 GB per file on the free tier.
#27 Troop Messenger
Free version provides instant messaging, voice/video calls, and file sharing up to 100 MB.
#28 Zoho Cliq
Collaboration tool from Zoho; free tier includes file sharing up to 100 MB per file.
#29 RingCentral Glip
Team messaging platform with free plan; supports file uploads up to 100 MB.
#30 Signal Desktop
Desktop companion to Signal mobile app; retains same encryption and file‑sharing limits (100 MB).
Free version for schools; includes chat, video, and file sharing (10 GB per user).
Free community servers allow file sharing up to 8 MB per file (or 100 MB with Nitro boost).
#33 Telegram Desktop
Desktop client for Telegram with the same 2 GB per‑file limit and secret chat support.
#34 WhatsApp Web
Browser‑based version of WhatsApp; retains 2 GB per‑file limit and end‑to‑end encryption.