What powers idpf.org?
Last seen Jun 2026 · 12 technologies across 10 categories
Analytics
Cloudflare Browser Insights
since Nov 2025
Cache Tools
Varnish
since Jun 2018
CDN
Cloudflare
since Jun 2024
CMS
JavaScript libraries
Miscellaneous
Programming languages
PHP
since Jun 2018
Reverse Proxy
Nginx
since Jun 2018
Security
HSTS
since Sep 2022
Tag Managers
Google Tag Manager
since Jan 2019
Top search keywords
| Keyword | Position | Est. monthly visits |
|---|---|---|
| epub | #11 | 550 |
| epub 3.0 | #2 | 34 |
| edupub | #3 | 7 |
| epub 3 | #4 | 7 |
| epubs | #42 | 4 |
| fixed layout | #3 | 4 |
| epub spec | #4 | 3 |
| best epub reader | #55 | 2 |
| publication date | #79 | 2 |
| idpf | #10 | 2 |
| index ebooks epub | #8 | 2 |
| epub format | #72 | 2 |
| epub fixed-layout | #6 | 2 |
| epub 3.0 | #12 | 2 |
| bookserver | #7 | 1 |
| what are opf files | #14 | 1 |
| what is an opf file | #12 | 1 |
| what is opf format | #10 | 1 |
| readium | #69 | 1 |
| readium | #61 | 1 |
| readium | #43 | 1 |
| site epub | #36 | 1 |
| antonym for thermostat | #59 | 1 |
| opf file format | #7 | 1 |
| opf file | #16 | 1 |
The site's top keywords in Google (US), with the visits each one is estimated to bring per month.
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
Open Page Rank
7.52 / 10 · ranked #16,897 of all domains
606 referring domains · OpenPageRank
Search traffic
650 est. monthly organic visits (US)
111 keywords in Google's top 30
Page
- CDN: Cloudflare
- Weight: 0.3 MB · 28 requests
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| idpf.org | 9 |
| www.idpf.org | 6 |
| validator.idpf.org | 3 |
Full technology history →
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Recent changes
- detected Cloudflare Browser Insights Nov 2025