Custom CSS by Denis

Minimal and secure way to add custom CSS per-domain

Custom CSS by Denis is a minimalist Chrome extension designed to let you add custom CSS styles on a per-domain basis securely and efficiently. Unlike other tools, it prompts for permissions only when you start editing CSS on a specific domain, ensuring your privacy by not requiring access to all websites at all times.

The extension features a clean, clutter-free interface focused solely on the editable CSS area for the current domain. When you stop using custom CSS for a domain, the related permission is automatically revoked, maintaining a high standard of security. Ideal for users who want to personalize website appearances without compromising on safety or usability.

Download

By:: https://sokolov.cc
Users:: 10,000+
Rating:: 4.52
(54)
Version:: 1.3.5 (Last updated: 2025-01-03)
Creation date:: 2018-10-20
Risk:: Very low risk impact Low risk likelihood
Permissions:: activeTab
scripting
storage
Size:: 165.89K
Email:: de*****@sokolov.cc
URLs:: Website
Full description:: See detailed description
Source:: Chrome Web Store
Updated:: a day ago

Ranking

# 7,884 ▼ 320

Other rankings

#6887 in Workflow & Planning ▲ 10 #70 in permission keyword 13 ▼ 7 #71 in permissions keyword 5 ▼ 6 #141 in domain keyword 16 ▼ 6

User reviews

Users appreciate Custom CSS by Denis for its simplicity, reliability, and effectiveness in customizing website appearances without complex setups. It helps fix UI and accessibility issues and respects site-specific permissions. However, common drawbacks include inability to style same-domain iframes, a CSS character limit around 7500, occasional overriding of styles by sites requiring !important flags, limited editor features, and minor UI issues like icon visibility on dark themes.

Pros

Simple and easy to use, works perfectly without fuss.
Allows injecting custom CSS locally without needing login or pro versions.
Effective for improving UI, accessibility, and usability on various websites.
Supports granting permissions only to specific sites instead of all pages.
Open source and minimalistic with live style application.

Cons

Does not apply styles within iframes even of the same domain.
Potential character limit around 7500 in CSS styles, causing saving issues.
Custom styles sometimes overridden by site styles, requiring !important declarations.
Lacks advanced editing features like syntax highlighting or auto-completion.
Extension icon visibility issues on dark browser headers.

Recent reviews

Thanks a lot! 🙏

Muhammet Emin ÖNER, 2025-03-13

Exactly what I was looking for! This is a lifesaver as a CS major.

Jac Chambers, 2025-02-12

Great extension. Been using for months and have had no issues. Simple and does what you expect. Thanks. One request: possible to get the styles to be applied to an iframe of the same domain? Currently the styles only get applied to the parent window. Using a Javascript extension similar to this one to inject the styles into the iframe.

Ryan Hanson, 2025-02-07

View all user reviews

Extension safety

Risk impact

Custom CSS by Denis does not require any sensitive permissions.

Risk impact analysis details

Risk likelihood

Custom CSS by Denis has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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