Why Chrome may have quietly downloaded a 4GB file to your PC – and how to get rid of it


Google Gemini

Lance Whitney/ZDNET

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ZDNET’s key takeaways

  • Google is downloading a 4GB file to the PCs of many Chrome users.
  • The file is harmless and is used for the Gemini Nano on-device LLM.
  • You’ll see it if you’ve opted into the on-device AI setting in Chrome.

Google is silently saving a Chrome-related file to many computers. That’s nothing earth-shaking. But this file is a hefty 4GB in size, which has caught the attention of some Google watchers. What is the file, why is it being installed, and how can you check for it?

Also: I let Chrome’s AI agent shop, research, and email for me – here’s how it went

In a new blog post, computer scientist Alexander Hanff, aka the Privacy Guy, pulled back the curtain on this mysterious file. Named weights.bin, the file is being downloaded deep within the user data folder of many Chrome users. The file itself is related to Gemini Nano, which Google is using as the on-device AI model for Chrome users.

If you delete the file, it comes back

Though there’s nothing risky or dangerous about the file, Hanff and others have expressed concerns that it’s being downloaded without users’ knowledge or permission. And if you delete the file, it eventually comes back, Hanff said. That by itself is hardly alarming; that’s part of any software update. Rather, some of the criticism centers on the file’s size. If you have ample hard disk space, then 4GB is likely not a big deal. But if you’re running low, that big a file might chew up space you can’t spare.

Traditionally, AI models like Gemini use the cloud to interact with you. Submit a request, ask a question, or kick off a conversation, and the AI taps into its online data and resources to respond. But that method can be slow and naturally requires that you be connected. By traveling between your device and the cloud, your data can also be exposed.

A trend has emerged in which companies are experimenting with locally stored LLMs (large language models). That not only speeds up the process, but it also means you can use the AI offline and more securely. Gemini Nano has already been in play on Google’s own Pixel phones.

That explains why the file is so large; it has to pack in a lot of data. In this case, a weights file contains numbers that measure the level of importance an AI model assigns to your input. The AI uses these values to determine what should come next. For example, let’s say you start typing the phrase “Why did my new phone cost me an arm and a…” at the prompt. The AI assigns weights to your input to help it predict that the next word would be “leg.”

Also: This powerful Gemini setting made my AI results way more personal and accurate

How can you tell if the file has been downloaded to your PC? First, open Chrome, go to Settings, and select System. On the System screen, check whether the On-device AI option is turned on. If so, then you probably have the file or will soon get it.

To double-check, you’ll have to navigate to the user folder on your PC. That location varies based on your operating system. On my Windows 11 PC, I ran a search in File Explorer for weights.bin. The search took a long journey through the following path: C:\Users\lance\AppData\Local\Google\Chrome\User Data\OptGuideOnDeviceModel\2025.8.8.1141. At that final location, the weights.bin file appeared, measuring 4GB.

Since the file is downloaded again if you simply delete it, you’ll have to take an extra step to get rid of it permanently. After you delete the file, go back to Settings in Chrome and select System. Then  turn off the switch for On-device AI.

But as long as you have enough disk space (and if you can’t spare 4GB, then it’s time to clean up your drive), the file is little cause for concern. Just forget about it, especially if you’re keen to try on-device AI, and we’ll see what the future holds for Gemini Nano.





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Recent Reviews


Gemini on Android Auto

Kerry Wan/ZDNET

Follow ZDNET: Add us as a preferred source on Google.


ZDNET’s key takeaways

  • Gemini is now widely available in Android Auto.
  • It can integrate with Google services and other apps.
  • The AI answered both simple and complex, multi-step questions. 

Despite Google’s insistence on packing artificial intelligence into nearly every conceivable product, I haven’t really found too much day-to-day use for it. That might change now. 

Over the weekend, I noticed my Android Auto had updated to include Gemini. I decided to give it a quick test, and it deftly answered my questions. When I started to dive deeper, though, I was surprised by just how much it could do and how easily it handled what I thought were more complex asks.

Also: Your Android Auto just got 5 useful upgrades for free – and Google isn’t done

Here are some of the best ways I’m using the new Gemini integration. To get started for yourself, you can either use the mic button on your steering wheel or say “Hey Google.” 

1. Finding hours or other information about local businesses

When using my phone in the car, most of the time I’m checking hours for a local business or researching nearby restaurants or stores. I found that Gemini is perfect for quick, simple questions like, “What time does Tony’s Ice Cream close?” But it’s also great for diving a little deeper.

I’m the type of person who likes to do a lot of investigating when I’m trying to find a new restaurant. I like to know what makes each one special and what people recommend — before I decide. Gemini does very well in situations like this. 

Also: Google just gave Android Auto its most significant update yet – and we tested it on the road

I asked for the best local spots to find ice cream. Instead of just showing a list, Gemini began detailing each spot, noting that the number one recommendation was “a legendary local spot with more than 100 years of history scooping up happiness.” It went down the list, offering up recommendations about each option, and then it even asked which one I wanted to navigate to.  

2. Tracking down info deep in your email

My wife and I had tickets to a show this weekend, and while I knew where I was going, I decided to see if Gemini would help. Without mentioning the theater or the show’s name, I just asked, “What’s the address for the show tonight?” Gemini thought for a few seconds and then replied that my confirmation email didn’t mention an address before asking, “Do you want me to find that information online?” When I said I did, it quickly found the address and offered to start navigation.  

I asked Gemini several other email-specific questions like “What’s coming in the mail today?” (thanks to USPS Informed Delivery) and even some vague ones like “When is that thing I ordered from the TikTok shop arriving?” or “I remember a coupon for a haircut in my email, when does that expire?” It handled each one perfectly.

Also: How to clear your Android phone cache – and why it greatly improves performance

Instead of opening my Gmail app, scrolling to find what I need or searching, and then opening the message, I can now get this info quickly with Gemini’s help.

3. Getting answers on the go, and keeping the conversation going

I’m the type of person who immediately looks up the answers to random questions that pop in my head — things like, “Where is the Australian Shepherd dog breed from,” “How do I make polymer clay earrings?” (my wife had seen some at a vendor fair), or “How do I make an electromagnet for an elementary school science project?”

Instead of Googling these queries, I asked Gemini. I wasn’t surprised to get a response, but I was surprised by how Gemini offered to keep things going. Every time Gemini offered an answer, it would ask if I wanted to talk more. I found myself having a conversation about my dog and why he doesn’t shed nearly as much as my other one, about the best way to present my son’s electromagnet, and even about different ways to make clay earrings and which option was best. 

4. Saving reminders and notes

I live by my Google Calendar, and if I don’t have something saved there, there’s a good chance I’ll forget it. The same goes for my reminder list in Google Keep. Quite often, while I’m driving, I’ll have a thought I want to remember later. Gemini, through Android Auto, was able to add things to my Keep lists and add things to my Calendar. It also gave me a rundown of what’s on my calendar and even asked if I wanted help getting ready for a meeting tomorrow (which was actually my wife’s event on our shared calendar). 

Also: The best AI chatbots: Expert tested and reviewed

5. Picking the perfect playlist

When it comes to the radio in my car, I’m constantly bouncing between podcasts, the song that got stuck in my head because it was viral on TikTok, whatever my kids request, or a huge variety of other songs. That means I’m often bouncing between Spotify, YouTube, and my XM radio. 

I often want to hear a specific song or album, and I was able to get Gemini to pull up specific songs using Spotify and YouTube and to stick to songs from that album. When I was in a more general mood, I got Gemini to tune to a specific XM station for me. 

I haven’t stumped AI yet

Overall, I’m finding that Gemini can handle at least 90% of tasks I’d otherwise pick up my phone for, from basic questions to more in-depth, multi-level questions. It was able to integrate with Google services like Gmail and apps, but also several other apps. 

Also: Google’s Gemma 4 model goes fully open-source and unlocks powerful local AI – even on phones

The basic questions are more common, but the ones that require research are where Gemini shines. I kept trying to think up new things to ask, and I had trouble finding something that would genuinely stump the AI. If, like me, you haven’t really embraced Gemini yet, Android Auto might just be your ticket in. 





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