Mozilla Thimble Website Poster Image

Mozilla Thimble



Fantastic online editor teaches kids to write the Web.

What parents need to know

Educational value

Kids can learn the basics of HTML (hypertext mark-up language, the language of the Web) and CSS (cascading style sheets for web design). With starter projects, the advanced tutorials, and the Thimble editor, kids can remix and create their own Web projects. Through remixing others' work, kids can also learn about educational and transformative fair use, copyright, and open content licensing. Mozilla Thimble is an excellent free and open resource for teaching kids to code their own webpages.

Positive messages

As part of Mozilla's Webmaker site, Thimble champions kids' authoring on the Web.


There is no violence in Thimble. Users can choose what content they put into webpages, but the mission and social standards of the Thimble community are completely kid-friendly.

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Thimble encourages kids to be producers, rather than consumers, of online media.

Drinking, drugs, & smoking
Not applicable

Parents Need to Know

Parents need to know that Mozilla Thimble is an online application that lets kids remix webpage projects and complete their own. Thimble is part of Mozilla's teaching resources site dedicated to making it easy and fun for kids to learn how the Web works. Kids can get started right away with sample activities, but will need to sign up for a free account to publish the projects and webpages they complete.

What's it about?

Kids can find \"starter projects\" to help them begin making webpages in MOZILLA THIMBLE. As soon as a project loads, kids can remix code in one window and see the effects of their changes in the window next door. As kids come to recognize the HTML \"tags\" or codes for things like colors, fonts, and images, they can begin predicting what their changes will do. When kids are ready to author their own webpages, they can create new Thimble projects. By publishing projects and webpages, kids can share their authentic webmaking with others.

Is it any good?


Thimble is an excellent tool for teaching HTML and making webpages. Because it shows two windows at once -- one for code and the other for the webpage -- it's always clear to kids how what they do in the code changes the appearance and content of the webpage. Thimble's starter projects give kids easy and fun ways to begin coding, but the editor and more challenging projects let Thimble scale up for more in-depth learning about HTML and how webpages work.

The authors of each project take care to include helpful instructions, and the Webmaker community is full of mentors ready to answer questions about Thimble and the Web. Thimble teaches kids to write code in a much more welcoming and supportive way than most other learn-to-code sites do.

Families can talk about...

  • Families can explore how webpages work and how to build web pages with HTML.

  • Families can discuss what kind of information is OK to share online and what kinds of information should be kept private.

  • Have kids apply their new web-authoring skills by creating new webpages for family events, interests, or trips.

  • Families can talk about the different kinds of web content (such as memes) and how web pages communicate different kinds of messages.

Website details

Subjects:Language & Reading: reading, reading comprehension, text analysis, writing
Math: patterns, ratio
Hobbies: building
Skills:Thinking & Reasoning: decision-making, part-whole relationships, problem solving, thinking critically
Creativity: developing novel solutions, making new creations, producing new content
Self-Direction: achieving goals, work to achieve goals
Emotional Development: developing resilience, moving beyond obstacles, persevering
Communication: conveying messages effectively, multiple forms of expression, presenting
Collaboration: group projects, meeting challenges together
Responsibility & Ethics: following codes of conduct, honoring the community, making wise decisions
Tech Skills: digital creation, using and applying technology
Pricing structure:Free

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What parents and kids say

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Educator Written byravi1610 August 14, 2013

Mozilla Thimble amazing code editor.

Really simple with great interface.
What other families should know
Great messages
Safety and privacy concerns
Adult Written byRajan D. August 23, 2016


It is a fun, interactive way to learn Javascript, CSS or HTML. It may be hard for younger people to use the website though.
What other families should know
Great messages