5 Chrome extensions for live CSS editing

Fact-checked 14 September 2026

Five ways to change a page's CSS in Chrome, from testing a breakpoint to saving a personal theme.

The right CSS editor depends on what you want to keep. A temporary layout experiment, an exported stylesheet change, and a theme that reloads whenever you visit a site are different jobs. These extensions cover those workflows without requiring you to start in your code editor.

This list is published by Responsive Tester, which shares a developer with Screen Ruler. Selections describe documented capabilities and editorial use cases, not measured performance rankings.

Which CSS editor fits your task?

OUR PICK

1. Responsive Tester: edit across viewports

Responsive Tester displays a page at multiple widths and lets you edit its CSS from one panel. Select an element, change a declaration, and compare the resulting phone, tablet, and desktop layouts together. Existing-rule edits retain their media-query context and apply in viewports where the corresponding rule exists and its conditions match.

The editor tracks changes for CSS export and supports undo and redo. This is useful when a fix looks good at one width but causes a different problem elsewhere: the other viewports stay visible while you work.

Live CSS editing is a Pro feature, included in the seven-day trial. The core viewport tools remain free. Stylesheet-rule edits are saved locally and restored to matching rules during the trial or with Pro. Copy the changes into your project to ship them. See the editor documentation and plan comparison.

Choose it for: a workflow centered on responsive breakpoints. The step-by-step CSS guide shows how to isolate a change and check neighboring widths.

2. Screen Ruler: inspect and edit in one place

Screen Ruler's editor exposes matched stylesheet rules, editable selectors, and declarations grouped by media context. Its Changes tab groups edits by stylesheet and can copy them as CSS. Its editing tools also cover page text and HTML structure.

That combination suits a review where you move between understanding a page and trying a new version of it. For example, inspect the rules behind a component, adjust its spacing, and try different text without switching to a separate editing extension.

Live editing belongs to the Studio tier and is available during the seven-day Studio trial. Check the official editing documentation for the workflow and the current plans for access details.

Choose it for: broader page inspection and editing, including experiments that involve content or structure as well as CSS.

3. VisBug: manipulate the page visually

VisBug is an open-source set of web design debugging tools. Its documented features include point-and-click editing, multi-selection, style and alignment inspection, text editing, and image replacement. The controls bring design-tool interactions into the rendered page.

Choose it for: exploring how a page could look through direct manipulation. If selecting several elements and nudging a design feels more natural than starting with a stylesheet, this is a useful approach to try. The official project README links to the Chrome extension and its tool documentation.

Its documentation explicitly distinguishes visual editing from interaction prototyping: produce the page state you want to review, then edit that state.

4. Stylebot: save changes to sites you visit

Stylebot provides a Basic editor for picking and styling elements and a Code editor for writing CSS. Its site describes saved website changes, optional Google Drive sync, and local downloads of your styles. It is free and open source.

Choose it for: personal changes you want to reuse, such as a different font, color scheme, or page layout. Those saved browser styles serve a different purpose from committing a change to the website's own source. See Stylebot's official feature overview.

5. Amino: write persistent CSS and SCSS

Amino applies custom stylesheets to individual pages or whole domains. Its documented editor supports CSS and SCSS, autocomplete, and auto-indent. Enabled stylesheets apply again when you revisit the page, and its inspector helps identify selectors and colors.

Choose it for: writing and organizing personal website themes in code. Page and domain targeting are useful when a stylesheet should affect one URL or a whole site. The official Amino site explains its editor and stylesheet management.

What to check before choosing

Decide whether you need to inspect the site's existing rules, experiment visually, or maintain your own saved overrides. Then try a small real task: change a heading's size, review the result at a narrow and wide viewport, and confirm how you keep the result.

Chrome already includes a CSS editor in DevTools. An extension is useful when its workflow helps you do something you repeat, such as comparing several widths or reapplying a personal theme. Chrome's CSS documentation is a good starting point for the built-in option.

For viewport-focused choices, see the responsive testing extensions list. For a review after editing, use the responsive testing checklist.