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Microsoft vs PDF.js

Based on 2421 and 3 real audits

View Microsoft details | View PDF.js details
MetricMicrosoftPDF.jsWinner
Performance3920Microsoft
Accessibility8991PDF.js
Best Practices8678Microsoft
SEO8992PDF.js
Security6665Microsoft
TTFB329ms275msPDF.js
Composite7271Microsoft
Performance
Microsoft
39
PDF.js
20
Accessibility
Microsoft
89
PDF.js
91
Security
Microsoft
66
PDF.js
65
SEO
Microsoft
89
PDF.js
92
Composite
Microsoft
72
PDF.js
71

Microsoft outperforms PDF.js in 4 of 7 categories, with a stronger composite score (72 vs 71). PDF.js leads in accessibility, SEO, TTFB.

When to choose Microsoft

Choose Microsoft when your primary concern is performance and best practices. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose PDF.js

Choose PDF.js when your primary concern is server response time and SEO. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 2421 audited Microsoft sites and 3 audited PDF.js sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

Small sample: one or both technologies have fewer than 10 audited sites. Treat these numbers as directional — medians stabilize around 20–30 audits per side.

FAQ

Which is faster, Microsoft or PDF.js?
Based on real BeaverCheck audits, Microsoft sites score higher on Lighthouse performance (39 vs 20 on average).
Which has better security, Microsoft or PDF.js?
Microsoft sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, Microsoft or PDF.js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor PDF.js (91 vs 89). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, Microsoft or PDF.js?
PDF.js sites score higher on Lighthouse SEO signals (92 vs 89 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), Microsoft or PDF.js?
PDF.js sites show lower Time to First Byte (275 ms vs 329 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose Microsoft or PDF.js for my website?
Both platforms have trade-offs. Microsoft scores higher on overall composite score while Microsoft may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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