Mastros
Chrome extensions that export WhatsApp, Telegram, LinkedIn, Instagram and TikTok data to Excel or CS

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Mastros builds privacy-first Chrome extensions that export and download the data you can already see in WhatsApp Web, Telegram Web, LinkedIn, Instagram and TikTok, to Excel, CSV, JSON or JSONL.

Every extension runs entirely in the browser. Nothing is uploaded to a Mastros server, no API keys or developer credentials are needed, there is no second login, and nothing is automated: the extensions never send messages, never invite anyone and never auto-reply. They read what your own signed-in session already displays and save it to a file.

The Telegram extension exports group members, chat messages, contacts and mutual groups, and bulk-downloads photos, videos, documents and voice notes from any chat or channel. The WhatsApp extension exports group members, messages and your full contact list, and downloads a conversation's media in bulk. The LinkedIn extension exports profile, company, jobs and post search results plus Sales Navigator leads and accounts. Instagram and TikTok extensions cover follower, following and comment exports, original-quality media download, and exact engagement rates.

Mastros is used by growth and lead-gen teams, recruiters, community managers and researchers, and equally by people archiving a channel, backing up chats before switching phones, or pulling shared media out of a conversation. A free plan covers small exports; Pro and Scale plans raise the monthly limits.

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