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Toolkit
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Screenshot of Lightning-Fast Web Performance website
Visit Link
https://scottjehl.com/lfwp/

Lightning-Fast Web Performance

Filed under Learning, Speed Testing

A free online lecture course by Scott Jehl. Learn to analyze site performance, fix issues, monitor for regressions, and deliver fast, responsive designs from the start.

Free

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Welcome to Toolkit! 🧰

Toolkit is a curated collection of tools & resources for people who make websites. Follow on Twitter for a fresh link daily or browse the site to discover the growing collection.


More from Speed Testing

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Screenshot of Responsive Image Breakpoints Generator website
Visit Link
https://www.responsivebreakpoints.com/

Responsive Image Breakpoints Generator

Filed under Speed Testing, Test & Optimise

Easily generate the optimal responsive image dimensions. One image for all screen resolutions and different devices is not enough. An image per pixel is too much - so how can someone automatically choose the optimal responsive image sizes?

Free
Screenshot of Lightning-Fast Web Performance website
Visit Link
https://scottjehl.com/lfwp/

Lightning-Fast Web Performance

Filed under Learning, Speed Testing

A free online lecture course by Scott Jehl. Learn to analyze site performance, fix issues, monitor for regressions, and deliver fast, responsive designs from the start.

Free
Screenshot of BlurHash website
Visit Link
https://blurha.sh/

BlurHash

Filed under JavaScript, Open Source, Speed Testing

BlurHash takes an image and gives you a short string that represents the placeholder for an image for a more seamless loading experience.

Free
Screenshot of Polypane website
Visit Link
https://polypane.app/

Polypane

Filed under Accessibility, Accessibility Testing, Browser Testing, Code, Code Quality, Developer Tools, Productivity, Software, Speed Testing, Test & Optimise, UX Design

Develop, debug and test websites and apps twice as fast. Know for sure your sites and apps work everywhere and for everyone.

From £8/month
Screenshot of Jpeg.io website
Visit Link
https://www.jpeg.io/

Jpeg.io

Filed under Developer Tools, Speed Testing, Test & Optimise

Convert any major image format into a highly optimized JPEG.

Free
Screenshot of ImageOptim website
Visit Link
https://imageoptim.com/mac

ImageOptim

Filed under Services, Software, Speed Testing, Test & Optimise

ImageOptim makes images load faster. Removes bloated metadata. Saves disk space & bandwidth by compressing images without losing quality.

Free
Screenshot of Squoosh website
Visit Link
https://squoosh.app/

Squoosh

Filed under Speed Testing, Test & Optimise

Squoosh is an image compression web app that allows you to dive into the advanced options provided by various image compressors.

Free
Screenshot of WebPageTest website
Visit Link
https://www.webpagetest.org/

WebPageTest

Filed under Browser Testing, Speed Testing

Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds. You can run simple tests or perform advanced testing including multi-step transactions, video capture, content blocking and much more. Your results will provide rich diagnostic information including resource loading waterfall charts, Page Speed optimization checks and suggestions for improvements.

Free
Screenshot of web.dev website
Visit Link
https://web.dev/

web.dev

Filed under Accessibility, Accessibility Testing, Code Quality, Speed Testing, Test & Optimise

Get the web's modern capabilities on your own sites and apps with useful guidance and analysis from web.dev.

Free
Screenshot of Nibbler website
Visit Link
https://nibbler.silktide.com/

Nibbler

Filed under Accessibility, Accessibility Testing, Developer Tools, SEO, Speed Testing

Nibbler is a free tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology.

Free
Screenshot of Google Mobile Speed Test website
Visit Link
https://www.thinkwithgoogle.com/intl/en-gb/feature/testmysite/

Google Mobile Speed Test

Filed under Speed Testing, Test & Optimise

Test your mobile site speed in realistic conditions and receive actionable recommendations using this handy Google utility.

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