Export your Telegram and WhatsApp data without leaving your browser
Two Chrome extensions that export members, messages, contacts, and media from the Telegram and WhatsApp conversations you already have access to — straight to CSV, JSON, or JSONL. Built for researchers, analysts, and community operators.
Browser-based workflow. User-initiated exports. Data stays under your control.
Tools Built by Mastros
A growing ecosystem of browser-based data export tools for Telegram and WhatsApp. Each tool does one thing extremely well.
Telegram Data Scraper
A Chrome extension that runs directly inside Telegram Web and helps you export structured datasets and bulk-download media from conversations and groups you can access. All processing happens locally in your browser.
Messages
Export chat messages with sender, timestamp and content. Useful for research, conversation analysis and data archiving.
Members
Export member information from Telegram groups you belong to. Useful for community analysis and organization workflows.
Contacts
Organize contact data from Telegram interactions into structured exports. Export lists for research tools or workflows.
Media
Bulk-download photos, videos, documents and voice notes from any chat or channel you can access. Unlimited on paid plans.
WhatsApp Data Scraper
Turn visible WhatsApp Web chats, contacts, and groups into clean, structured exports. A Chrome extension that runs directly inside WhatsApp Web — Web Mode only, no API, no automation, all processed locally in your browser.
Group Members
Export every visible member of an open group — name, number (when shown) and role — from the group info list.
Messages
Export the loaded history of an open chat with sender, timestamp and content, plus the chat's contact card.
Recent Contacts
Export names, previews and numbers from the rows in your chat list. Nothing needs to be open.
How It Works
Install the extension
One click install from the Chrome Web Store.
Open Telegram Web or WhatsApp Web
Navigate to web.telegram.org or web.whatsapp.com and log in.
Export structured data
Select a chat or group and start exporting instantly.
All processing runs locally inside your browser. Your Telegram and WhatsApp data is never transmitted to external servers.
Features
Local-first architecture
No external servers process your data. Everything runs in your browser.
CSV, JSON & JSONL export
Download structured datasets ready for analysis, plus media as a ZIP.
Purpose-built scrapers
Members, messages, contacts, and media — each with its own extraction mode.
Large dataset support
Designed for large communities and long conversations.
User-initiated exports
Nothing runs in the background — you trigger every export.
Privacy by design
Your data never leaves your browser.
Contact
Need help, want to report a bug, or have a partnership request? Reach us at admin@mastros.online.