Accessibility
- WAVE Web Accessibility Evaluation Tool – Paste a page URL and see accessibility errors marked up in place. The quickest first check after publishing.
- WebAIM Contrast Checker – Check that your text and background colours pass WCAG contrast requirements.
- W3C Easy Checks – A short, non-technical list of accessibility checks anyone can do on a page.
- Alt text decision tree – Answers the everyday question: what should I type in the alt text box for this image?
- Writing good alt text – Practical examples of useful and useless image descriptions.
- axe DevTools browser extension – Free in-browser accessibility scanner for a page you are working on.
Writing for the Web
- Hemingway Editor – Paste your draft and it highlights long sentences and heavy wording.
- Plain Language guidelines – How to write pages people can scan, understand and act on.
- 18F Content Guide – A practical style guide for web content: headings, links, plain words.
Images & Optimization
- Squoosh – Shrink an image in the browser before uploading. Watch the file size drop as you adjust quality.
- TinyPNG – Drag-and-drop compression for PNG and JPEG files.
- Photopea – Full-featured image editor in the browser; opens PSD files.
- Unsplash – Free, high-quality photography, no account required.
- Pexels – Free stock photos and short video clips.
- Openverse – Search openly licensed images and audio, with the licence shown for each result.
Colour & Type
- Coolors – Generate and save colour palettes that work together.
- Google Fonts – Free web typefaces, with pairing suggestions.
- Adobe Color contrast analyzer – Test a text and background pair before you commit to it.
Site Health, Performance & SEO
- PageSpeed Insights – Google's speed and best-practice report for any public page.
- W3C Markup Validator – Find broken or invalid HTML in a page you have edited.
- W3C Link Checker – Crawl a page and list the links that no longer work.
- Google Search Console – See how your site appears in search results and which pages have problems.
- Google Rich Results Test – Check the structured data on a page.
Email & Domain Tools
- MXToolbox – Look up MX, SPF, DKIM and DMARC records, and check whether a mail server is blacklisted.
- Mail-Tester – Send a test message and get a spam score with the reasons behind it.
- DNS Checker – Watch a DNS change propagate around the world after we make it.
Documents & Cleanup
- Word to HTML cleaner – Strip the hidden Word formatting out of text before pasting it into TeamCMP.
- Adobe Acrobat accessibility checker – How to check a PDF is readable by screen readers before you post it.
- Smallpdf – Merge, split and compress PDF files in the browser.