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HTML-validate Review

Worth it

Should I use HTML-validate?

Offline HTML5 validator and linter - html-validate.org

· 2 weeks ago

Buy it if you are a developer or team that wants automated HTML validation in editors, tests, or CI — it is free and open source. Skip it if you are non-technical and just want to paste a URL into an online checker.

Confidence

Medium. Based on 10+ public sources; user-review evidence is thin, so confidence is medium.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in sources
  • Security posture

Pricing

$0

Open source

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Frontend teams linting HTML in CI
  • VS Code users writing HTML and templates
  • Component-library authors needing framework metadata
  • Accessibility-focused developers

Not for

  • Non-developers wanting paste-a-URL checks — use W3C Nu checker online instead
  • Anyone needing vendor support, SLAs, or a contract
  • Teams wanting a paid GUI validator with hand-holding
  • Solo site owners; a free online validator covers occasional use

Gotchas - check before you buy

medium

Support is GitLab/GitHub issues only; no SLA — budget time for self-service debugging

medium

Don't confuse with npm's 'html-validator' or paid 'CSS HTML Validator' ($69/user)

low

Third-party VS Code extensions share the name; verify the official publisher before installing

low

Formal user reviews are thin; most evidence is docs and curated lists

Pros and cons

Pros

  • Free, open-source offline HTML5 validator
  • Runs offline — no page uploads required
  • Official VS Code extension and Netlify deploy plugin
  • Custom rules and custom element metadata for component frameworks
  • Listed among the best free open-source HTML linters

Cons

  • tool required; no GUI for non-developers
  • No paid support; small-team open-source project
  • Community threads often point to W3C Nu checker first
  • Easily confused with name-alike and paid lookalike packages

Sources & method

- 10 sources - No known vulnerabilities found in the sources reviewed. Project publishes a dedicated security page.

official x4review x5security x1

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 10

    Sources

  • Analyzed

  • Value for money: 5/5. Fully free, open source, no limits
  • Ease of use: 4/5. CLI, VS Code extension, Netlify plugin
  • Feature depth: 4/5. Custom rules, element metadata, formatters, API
  • Support quality. No support evidence in sources
  • Security posture: 4/5. Publishes security page; no known CVEs
  • $0 Price Free and open source
  • 11.16.1 Latest version Actively published on npm
  • Top-7 list Recognition LinuxLinks free open-source HTML linters
  • VS Code Editor support Official marketplace extension

Pricing

Open source

$0

  • Full validator, rule set, CLI and JS API
  • VS Code extension and Netlify plugin

Security

No known vulnerabilities found in the sources reviewed.

Project publishes a dedicated security page.

What users say

Developers report using it inside editors and pipelines for template and component HTML, but formal review coverage is thin.

“I used the html-validate”
Reddit, r/golang
Full analysis

Based on 10+ public sources; user-review evidence is thin, so confidence is medium.

Free, offline HTML5 linter for devs and CI. Great if you write HTML in Node; wrong pick for one-click checking.

Methodology

Based on 10+ public sources; user-review evidence is thin, so confidence is medium.

Read how a report is made.

Sources

  1. html-validate on npmnpmjs.com
    official
  2. HTML-validate GitLab repositorygitlab.com
    official
  3. HTML-validate — Getting startedhtml-validate.org
    official
  4. HTML-validate VS Code extensionmarketplace.visualstudio.com
    official
  5. Product security pagehtml-validate.org
    security
  6. 7 Best Free and Open Source HTML Linter Toolslinuxlinks.com
    review
  7. HTML Conformance: A Comparison of 6.5 npm Validator Packagesmeiert.com
    review
  8. Reddit r/webdev: W3C Validator alternativesreddit.com
    review
  9. Reddit r/golang: VSCode tooling for html/templatesreddit.com
    review
  10. Curated static analysis tools listgithub.com
    review

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