C2 Password icon

C2 Password

by 群暉科技 · Privacy & Security
Manifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

A highly secure password management solution to store, sync, and safeguard your credentials.

Users
20K
0 in 30 days
Rating
4.8 / 5
+0.24 in 30 days
Ratings
309
+3 in 30 days
Store rank
#5,360
#4,619 among extensions
Version
3.0.0-5
updated 22 Jun 2026

Users

monthly, 3 years
3,00016K30KAug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 20,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
10160309Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 309 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About C2 Password

A highly secure and free password management solution for protecting your passwords and personal information. C2 Password lets you sync your credentials across an unlimited number of devices and access them from anywhere via the web portal, app, and browser extension. All the data you upload is encrypted before leaving your device, so you can rest assured that no one but you can access your data. This extension is useful in many ways: ✍️ Autofill logins - Automatically fill in usernames and passwords when signing in to websites. 💾 Auto-save passwords - Automatically save new passwords, usernames, and updates to saved passwords when signing in or creating new online accounts. 🆕 Generate unique passwords - Create a strong and random password for every website to increase account security. 📝 Autofill form data - Click payment and personal information in the extension to fill them in when shopping online. Save time while keeping your data safe. Get started with C2 Password today! 🔥 Get the most out of your extension: https://kb.synology.com/C2/tutorial/Get_started_with_C2_Password_extension ℹ️ For more information: https://c2.synology.com/password/overview 🔒 Privacy Policy: https://www.synology.com/company/legal/privacy 💬 Feel free to post any questions you have in Synology Community: https://community.synology.com/enu/forum/4

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%0+0.23
30 days0+0.0%+3+0.24
6 months−10K−33.3%+26+0.25
1 year−10K−33.3%+80+0.30

Chrome Web Store search rankings

Where C2 Password appears when people search the store, with the 30 day change
Search phrasePosition30 days
password#100
password-protected#15−5

Version history

58 versions recorded
3.0.0-522 Jun 2026
2.30.1723 Oct 2025
2.30.1124 Jul 2025
2.30.1011 Jun 2025
2.30.822 May 2025
2.28.811 Dec 2024
2.28.519 Nov 2024
2.24.317 Oct 2024

Details

Category
Privacy & Security
First seen
21 Jul 2021
Size
4.5 MB
Languages
de, en, es, fr, it, ru, zh-TW, ja
Pricing
Free
Privacy policy
synology.com
Support
c2.synology.com
Extension ID
kfmlopbepahlcjbkfnnklglgibbopkbk

Permissions and risk

Moderate riskimpact 3, likelihood 2
Permissions
activeTabalarmscontextMenusidleoffscreenprivacyscriptingstorageunlimitedStoragewebNavigationwebRequestwebRequestAuthProvider
Site access
<all_urls>
Can read and change data on every website you visit.

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