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Summarize WhatsApp Web group chats instantly using on-device AI. No data leaves your computer. You just missed 200 messages in a group chat. Now you have to scroll through memes, off-topic debates, and "ok" replies to figure out what actually happened. Sound familiar? WhatsApp group chats move fast. Important decisions get buried under casual banter. By the time you catch up, the conversation has already moved on. And if you are in multiple groups, it is even worse - you spend more time reading old messages than actually responding. WA Summarizer fixes this. One click, and you get a clear summary of any WhatsApp Web conversation. WHY CATCHING UP ON CHATS IS SO HARD WhatsApp was designed for real-time conversations, not for catching up later. There is no built-in summary, no highlights, no "what you missed" feature. - Messages are linear. Important info is mixed with greetings and reactions. - Group chats have multiple threads happening at once, with no separation. - Scrolling through hundreds of messages takes minutes you do not have. - Searching only works when you already know what to look for. Most people just skim and hope they did not miss anything important. Or they ask "what did I miss?" and wait for someone to reply - which creates even more messages. WA Summarizer gives you the answer instantly, without bothering anyone. WHAT THIS EXTENSION DOES WA Summarizer adds a single "Summarize" button to WhatsApp Web. Click it, and an AI model running entirely on your device reads the visible chat and produces a concise summary with key points. No copy-pasting into ChatGPT. No cloud API. No subscription. The AI runs locally using WebGPU acceleration in your browser. Here is what you get: TL;DR Summary - A 2-4 sentence overview of what the conversation is about. Main topics, decisions, and outcomes, not a list of individual messages. Key Points - The important facts, action items, and decisions extracted from the chat. Greetings and filler are filtered out automatically. One-Click Copy - Copy the summary to your clipboard instantly to paste into notes, emails, or other chats. Adjustable Length - Choose short (1-2 sentences), medium (3-4 sentences), or long (5-8 sentences) depending on how much detail you need. HOW IT WORKS 1. Open any chat on WhatsApp Web (web.whatsapp.com). 2. Click the green "Summarize" button in the top right corner. 3. Wait a few seconds while the AI processes the messages. 4. Read your summary in the side panel that slides in. The first time you use it, the AI model downloads once (about 300 MB). After that, it works offline with no additional downloads. WHY ON-DEVICE AI Most AI tools send your data to a server. For private conversations, that is a problem. Your chats contain personal information, business discussions, family matters - things that should stay between you and the people in the chat. WA Summarizer uses a small but capable AI model (Qwen2.5-0.5B) that runs entirely in your browser using WebGPU. Your messages are processed locally and never leave your computer. There is no server, no API key, no account, and no internet connection required after the initial model download. The summary panel even tells you: "Runs 100% on your device. Chats never leave your computer." REAL SCENARIOS WHERE THIS HELPS Morning Catch-Up: You wake up to 150 new messages in your family group chat. Instead of scrolling through breakfast photos and good morning messages, one click tells you that your sister confirmed Thanksgiving dinner at 6pm and your mom needs someone to bring dessert. Work Project Group: Your team discussed a client deadline while you were in a meeting. The summary shows the deadline moved to Friday, the design file is in the shared drive, and Alex is handling the client call. Three key points instead of 80 messages. Parent Group Chat: The school parent group has been active all day. Summary: field trip permission slips are due Thursday, the bake sale is moved to next week, and the PTA meeting is at 7pm. You now know everything you need to know in 10 seconds. International Friends: Your multilingual group chat mixes English, Spanish, and Chinese. The summarizer works with the conversation language, so you get a summary in whatever language dominates the chat. Buying/Selling Groups: Someone posted a good deal 6 hours ago and the chat has moved on. The summary highlights the key offers, prices, and any agreements reached. Event Planning: The birthday party planning group has 200 messages about venue options, food preferences, and budget. The summary extracts the decisions: Saturday at 7pm, Italian restaurant, $30 per person, bring your own drinks. WHAT THIS EXTENSION DOES NOT DO - It does not access your WhatsApp account or login credentials. - It does not send any data to external servers or APIs. - It does not read chats in the background. It only processes messages when you click Summarize. - It does not store your messages or summaries anywhere. - It does not work on the WhatsApp mobile app - only WhatsApp Web. The only permissions it uses: - storage - Saves your preferences (button visibility and summary length). Nothing else is stored. No network permissions for data collection. The model files are bundled with the extension or downloaded once from HuggingFace on first use. COMPLETELY FREE There are no usage limits, no daily caps, no premium tier, no account required. Every feature works out of the box, forever. The AI runs on your hardware, so there is no server cost to pass on to you. TECHNICAL DETAILS The AI model is Qwen2.5-0.5B-Instruct, quantized to 4-bit (q4f16) for efficient performance. It runs via WebLLM using WebGPU acceleration. This means it works on Chrome 124 or later on desktop computers with a GPU. The model processes the most recent messages in the visible chat (up to approximately 4000 tokens of context). For very long conversations, it focuses on the most recent portion. Summary quality depends on the conversation content. Substantive discussions with clear topics produce the most useful summaries. Very casual or fragmented chats may result in a simpler summary. WHO THIS IS FOR - People in active WhatsApp group chats who need to catch up quickly - Professionals who use WhatsApp for work coordination - Parents in school and activity group chats - Anyone who values privacy and does not want to send chat data to cloud AI services - International users in multilingual group chats GETTING STARTED Install the extension, open WhatsApp Web, and click Summarize on any chat. The model downloads automatically on first use. After that, every summary is instant and offline. No account needed. No sign-up. No API key. Just one click.