Chris Chedgzoy – Free SEO, Developer & eBay Tools

I'm Chris Chedgzoy, a semi-retired programmer and systems architect of 46+ years. This site is home to a growing toolkit of free browser-based utilities – SEO audits, schema checking, social share previews, image optimising, WCAG contrast and eBay fee calculations. No sign-ups, no ads, no tracking.

About Chris Chedgzoy • The Chedgzoy name • Get in touch

Featured tools

The six most-used. See all tools →

SEO Audit

Scored on-page SEO report across 25 checks. Tabs for headings, social tags, images, links and schema, with a ready-to-paste AI prompt to fix the issues.

Schema Markup Checker

JSON-LD deep audit with field-by-field Required/Recommended classification and a preview of how the rich result would render in Google.

Social Share Preview

See how your page appears on Facebook, X/Twitter, LinkedIn, WhatsApp, Slack, Discord, iMessage and Reddit. Replaces the retired Twitter Card Validator.

Image Optimiser

Convert images to AVIF, WebP, JPEG and PNG. Compare sizes across formats and quality levels, download individually or as a ZIP with picture-element HTML.

eBay Fee Calculator

UK 2026 rates. Calculate final value fee, per-order fee, international fee, promoted listings fee and your net take-home profit in seconds.

WCAG Contrast Checker

Instant WCAG 2.1 AA / AAA pass-fail for any foreground/background pair. Runs entirely in your browser.

About Chris Chedgzoy

Chris Chedgzoy has spent four decades building software – from BASIC and assembler on early micro computers through C#, ASP.NET and SQL Server in modern e-commerce, manufacturing and telecoms platforms. These tools are where Chris puts that experience to work in public. Curious about the unusual surname? There's a whole page on the Chedgzoy name.

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Got an idea?

I'm semi-retired and choosy about what I take on, but the right challenge still sparks my attention. If you'd like a fresh pair of eyes on a problem or want to know more about me first, the about page has the full story.

Get in touch