pdf4pro.com

https://pdf4pro.com· First analyzed 09 May 2026· Updated 09 May 2026

Export

pdf4pro.com

Mobile

Sponsored

Hosting Provider

Ultahost, Inc

IP Address

31.171.131.194

Site Location

🇳🇱 Netherlandsvia ip

Server Location

🇳🇱 Amsterdam, Netherlands

ASN

AS214036

Organization

Ultahost, Inc

Server

Nginx

CDN

Nameservers

vern.ns.cloudflare.com.lorna.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

853 ms10%

Speed Index

1.1 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1.9 MB

133 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Ultahost, Inc

CDN

Technology Stack

6 Technologies Detected

CSS Frameworks

Frameworks

Libraries

Fonts

Web Servers

SEO Analysis

B72/100

Meta Tags8/15

Content11/12

Headings6/8

Technical21/25

E-E-A-T0/7

Images4/7

Links3/5

URL5/5

Social3/5

Freshness4/4

Mobile4/4

Indexability3/3

pdf4pro.compdf4pro.com

PDF4PRO - is a modern search engine that looking for books, manuals...

PDF4PRO - is a modern search engine that looking for books, manuals, presentations and documents around the web

Title truncated.

Title Length111 chars

Recommended: 50-60 chars (~684px / 580px)

Description Length111 chars

Recommended: 120-160 chars

Issues (1)

• Title is too long (111 chars, ~684px). Will be truncated in search results.

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1,427 URLs

1427 sub-sitemaps

robots.txt

8 rules

Sitemap reference found

Local SEO

Local Search Readiness

14/100

Poor

4 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D49/100

Bot Access

20/25

Machine Read.

13/25

Schema Data

0/25

Citation

16/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

navheader/footer

Text ratio:7%

Words:874

Token eff.:Optimal

Depth:2/5

Structured Data

1 JSON-LD

Citation Readiness

Opening Summary

Descriptive Headings

Canonical URL

Open Graph3/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (6)

AI readiness recommendation preview...

Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

75/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

20/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

2 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

32/100

237 mg

CO₂e / view

1.9 MB

Page Weight

50%

Cleaner Than

New Visitor

270 mg

Returning (cached)

135 mg

Annual (10K/mo)

28.4 kg

Emission Segments

Data Center

53 mg

Network

57 mg

Device

127 mg

Resource Breakdown

JavaScript

94.3 KB

Images

1.7 MB

CSS

53.0 KB

Fonts

2.0 KB

HTML

15.3 KB

Other

320 B

Green Hosting Not Verified

Ultahost, Inc

4 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

56%Poor

Interactive

HTTPS

No WAF

56d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

Valid From

06.04.2026

Valid Until

05.07.2026

Subject Alternative Names (2)

*.pdf4pro.compdf4pro.com

SHA-256 Fingerprint

DD:94:94:B1:4F:37:4F:47:D5:B3:2E:4D:7E:F3:9B:79:71:FD:8A:4C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Sat, 09 May 2026 20:39:21 GMT

server

nginx

strict-transport-security

max-age=63072000; includeSubDomains; preload

x-cache

HIT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

Domain Information

pdf4pro.com

Domain Age

7y 5m

Created

13.11.2018

Expires

13.11.2028

Last Updated

11.04.2026

Registrar

Dreamscape Networks International Pte Ltd

DNSSEC

Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

57/100

Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=device-width, initial-scale=1

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Roboto + Open Sans

WCAG Partial

69/100

Readability

/30

20/30

14px · LH 1.43

Hierarchy

/20

16/20

2.57x ratio · ✓ H1→H6

WCAG

/25

18/25

1:1 min contrast

Performance

/25

15/25

2 fonts · 2 req

Heading Font

Roboto

Sans36px

Body Font

Open Sans

Sans14px

Contrast Ratio

1:1

1 issue

Reading Comfort

Dual Sans-Serif

left aligned

36px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.6x larger than body text.

GGoogle FontsFlesch 0

Color Palette

7 unique colors

Light

#ffffff

Background· 69.9%

#d4dcdb

Secondary· 5.7%

#317fa9

Primary· 5.4%

#05223b

Accent· 5.2%

#243a54

Secondary· 4.7%

#aab490

Secondary· 4.2%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

8 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)

Website Identity

pdf4pro.com

7 years old

Location detected: 🇳🇱 Netherlandsvia ip

Dreamscape Networks International Pte Ltden-US

Sponsored

Last analyzed: 09 May 2026 at 20:39

Historical Analysis & Change Tracking