B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
30%
30% -- file size reduction for WebP images (2025)
WebP images are often 30% to 50% smaller than equivalent JPEG or PNG files.
- Reported as a range from 30% to 50%
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
30%
Unit
Percentage
Data Vintage
2025
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
designbykiltz.com
Primary
Tier B
https://designbykiltz.com/website-tips/avoiding-the-online-spinning-wheel/ ↗
Source Article
Website Loading Slowly? Here’s Why And How To Fix It
A website loading slowly is one of the fastest ways to lose a visitor. The page starts, the spinning wheel appears, and nothing happens. Three seconds. Five. Most people don’t wait around to find out if it ever finishes.
Now flip that around. When it’s your website doing the spinning, those aren’t j…
Original Research
designbykiltz.com
· Original study ↗
Methodology
Range 30-50%, midpoint reported
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
WebP images: 30% file size reduction. Source: designbykiltz.com (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/webp-size-reduction-vs-jpeg
HTML Embed
<blockquote cite="https://lighthousedata.io/data/webp-size-reduction-vs-jpeg" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>30%</strong> -- file size reduction for WebP images<br><small>Source: designbykiltz.com (2025) · <a href="https://lighthousedata.io/data/webp-size-reduction-vs-jpeg" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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