Browser Extensions & Plugins
Privacy-first Chrome extensions that export chat and social media data to spreadsheets
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Mastros makes Chrome extensions that let you export contacts, messages, followers and search results from WhatsApp, Telegram, LinkedIn, Instagram and TikTok as
Mastros builds five Chrome extensions for exporting data from major messaging and social platforms. Each extension works on the web client for WhatsApp, Telegram, LinkedIn, Instagram or TikTok, and exports the data your signed-in account can already see—such as group members, chat messages, contacts, search results and media—to CSV, JSON, JSONL or XLSX files.
All data processing happens inside your browser. The extension reads only what the page has loaded, never sends or posts anything, and nothing runs automatically; you press the button to start each export. Your data never leaves your computer or reaches Mastros servers.
Features vary by platform: WhatsApp exports group members, messages, recent contacts and media; Telegram adds mutual groups; LinkedIn exports searches from People, Company, Jobs and Posts, plus Sales Navigator; Instagram and TikTok export followers and creators with bio email, website and engagement rate. Instagram and TikTok are in free, unlimited beta.
Pricing model: Freemium
Free: 100 profiles and 100 messages per month (WhatsApp), or 250 profiles and 300 messages per month (Telegram), or 250 records (LinkedIn). Instagram and TikTok free and unlimited in beta. Pro: $9/month with 5,000 profiles and 10,000 messages per month (WhatsApp), or 5,000 records (LinkedIn). Scale:
Yes. Everything runs inside your own browser and your data never reaches Mastros servers. There is no account, API key or password required; the extension works through your existing session. It only reads what the page has loaded, never sends or posts anything, and nothing runs automatically—you press the button every time. The extension is verified on the Chrome Web Store as created by the owner of this website.
Mastros does not perform actions that get accounts banned. It sends no messages, follows no one, joins no groups and makes no requests on its own—it only reads responses your browser has already loaded. On LinkedIn there is an additional hourly safety cap to prevent large exports from appearing as rapid activity. However, you are responsible for how much you export and for following each platform's terms.
Mastros exports to CSV, JSON, JSONL and XLSX (Excel). Telegram also supports ZIP format for bundled media downloads.
No. Mastros extracts only email addresses and websites that are publicly visible in creator bios on Instagram and TikTok. It never guesses, finds or buys email addresses from external data providers.
Reading data that is already visible to you, on an account you are logged into, for your own records is a different question from collecting and redistributing other people's personal data. Mastros only does the first. What you do with the file afterwards is governed by the platform's terms and by privacy law where you are (GDPR in the EU, and equivalents elsewhere). Mastros is not a law firm and this is not legal advice.
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