Have years of LINE chat history sitting untouched? Upload them to Google's NotebookLM, and AI will summarize, analyze, and search through your massive chat logs for you.
In this guide, we walk you through exporting your LINE chat history and loading it into NotebookLM for AI-powered analysis.
1. What is NotebookLM
NotebookLM is an AI-powered research and note-taking tool provided by Google. Upload documents such as PDFs or text files, and the AI will understand their content to provide summaries, answer questions, and perform analysis.
- Answers based solely on your uploaded sources (minimal hallucination)
- Supports text files (.txt), PDFs, Google Docs, web pages, and more
- Handles up to 500,000 words and 200 MB per source
- Upload up to 50 sources on the free plan
- Available immediately with a Google account
Key point: NotebookLM only references the content of your uploaded documents when generating answers. Unlike general-purpose AI chatbots, it does not mix in outside information, making it ideal for analyzing chat history.
2. What You Can Do — Use Cases
Once you load your LINE chat history into NotebookLM, here is what you can do.
Revisiting Memories
"What were we talking about in the summer of 2023?" "Where did we decide on the trip plans?" — the AI can dig through massive chat logs to find specific topics for you.
Organizing and Discovering Information
"List all the restaurant names that were shared." "Summarize everything we discussed about the move." — you can structure scattered information from your chats.
Summarizing Conversations
Extract key points from long group chats. Ask "Summarize last month's conversations" to skip through messages you do not need to read.
Sentiment Analysis and Trend Detection
"Did the tone of our conversations change over time?" "What word patterns come up frequently?" — meta-level analysis is also possible.
3. What You'll Need
- Google account (required for NotebookLM)
- LINE installed on your smartphone or PC
- PC browser (NotebookLM is used in a desktop browser)
4. Step 1: Export Chat History from LINE
LINE has a built-in feature to export chat history as a text file (.txt).
iPhone / Android
Open the chat room
Open the chat room you want to export.
Select "Export Chat History" from the menu
Tap the ≡ (menu) icon in the top right > More > Export Chat History.
Choose a save destination
Select a method that makes it easy to transfer the file to your PC, such as "Save to Files," email, AirDrop, or Google Drive.
Export format: LINE chat history is exported in .txt (plain text) format. Date, time, sender name, and message content are recorded chronologically. Images and videos are not included.
PC LINE (Windows / Mac)
Open the chat room
Open the chat room you want to export in LINE for PC.
Select "Save Chat"
Click the ≡ (menu) icon in the top right > Save Chat, then choose a save location.
What the exported file looks like
The exported text file will have a format similar to the following.
5. Exporting with ChatArchive
LINE's built-in export requires manual operation for each chat room, one at a time. If you have many chat rooms, ChatArchive lets you back up all chats in one go.
Import LINE data with ChatArchive
Launch ChatArchive and click "Import." It will automatically detect your LINE database and import all chats at once.
Export in .chatarchive format
Use the export feature to save all your chat history. You can then convert it to text as needed and feed it into NotebookLM.
Advantages of ChatArchive: Back up all chat rooms at once. Even if you have over 100 chat rooms, it only takes a single operation. All processing is done locally, so your privacy is fully protected.
Learn more about how to use ChatArchive
6. Step 2: Upload to NotebookLM
Open NotebookLM
Go to notebooklm.google.com in your browser and sign in with your Google account.
Create a new notebook
Click "New Notebook" to create one. Give it a descriptive name like "LINE Chat Analysis."
Upload your source
Click "Add Source," select "Upload File," and upload the .txt file you exported earlier.
Multiple files are OK
If you exported each chat room separately, you can upload multiple .txt files at once. The free plan supports up to 50 files.
File size limits: Each file can be up to 200 MB and 500,000 words. This is more than enough for several years of chat history, but if your file exceeds the limit, split it by time period.
7. Step 3: Ask AI to Analyze
Once the upload is complete, NotebookLM will process the source. You can then ask questions in natural language using the chat box at the bottom of the screen, and the AI will respond.
Auto-generated summary by NotebookLM
When you upload a source, NotebookLM automatically generates a source overview. This alone gives you a quick grasp of your entire chat history.
Answers with citations
NotebookLM's answers include citations to the source. You can see exactly which messages the AI's response is based on, making fact-checking easy.
8. Useful Prompts
Here are some example prompts you can use with NotebookLM. Feel free to copy and use them as-is.
Summary & Reflection
Information Search
Analysis
Practical Uses
9. Privacy Notes
Important: Chat history contains personal information. Please understand the following before proceeding.
How NotebookLM handles data
- Data is processed in accordance with Google's Privacy Policy
- Uploaded data is tied to your account and is not shared with other users
- Deleting a notebook also deletes the data
Before uploading
- Consent from others: If possible, inform the other parties before loading their conversations into an AI tool
- Check for sensitive information: Make sure the chat history does not contain addresses, phone numbers, passwords, or other confidential data
- Limit the purpose of use: Use the data only for personal reflection and organization, and do not share the conversation content with third parties
Want to analyze locally? If you prefer not to upload data to the cloud, you can use ChatArchive's full-text search feature to search and browse your chat history entirely on your local machine.
10. More Tips
Analyzing group chats
Group chats can be exported using the same steps. Try asking "Analyze each member's messaging tendencies" to discover communication patterns within the group.
Cross-room analysis
Upload text files from multiple chat rooms into the same notebook to search and analyze information across different conversations.
Using Audio Overview
NotebookLM has an "Audio Overview" feature that automatically generates a podcast-style audio summary based on your sources. You can listen to a spoken overview of long chat histories.
Regular backups
Export your chat history once a month and add it to NotebookLM to track changes over time.
Related Articles
- The Complete Guide to Backing Up All LINE Chat History on Mac
- How to Export All LINE Chat History to Text Files
- How to Use ChatArchive — Complete Guide from Installation to Advanced Usage
Batch Backup All Chats with ChatArchive
No more exporting one chat at a time. ChatArchive backs up all your chat history with one click.