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PDFx.pro: Compress PDF - Free Online PDF File Size Reduction — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Software And Applications →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
pdf2go.com ↗	70 match shared topic	Online PDF Converter - Edit, rotate, and compress PDF files	en	software-and-applications	robotsllmsaihumans	emailphone	none
projectsend.org ↗	65 match shared topic	ProjectSend - Secure File Sharing Made Simple \| Free Open Source Software	en	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
rarlab.com ↗	65 match shared topic	WinRAR archiver, a powerful tool to process RAR and ZIP files	en	software-and-applications	robotsllmsaihumans	emailphone	none
sodapdf.com ↗	65 match shared topic	Soda PDF - Software with Desktop and Online solutions for your PDF Files.	Canada~ en	software-and-applications	robotsllmsaihumans	emailphone	none
pdfforge.org ↗	65 match shared topic	pdfforge: Professional PDF tools	en	software-and-applications	robotsllmsaihumans	emailphone	none
novapdf.com ↗	65 match shared topic	PDF Creator - Easily Create PDF files with novaPDF	en	software-and-applications	robotsllmsaihumans	emailphone	none
fmphost.com ↗	65 match shared topic	FMPHost — FileMaker Hosting Pros \| Managed FileMaker Server Since 1999	en	software-and-applications	robotsllmsaihumans	emailphone	none
grahl-software.com ↗	65 match shared topic	Annotate, Edit and Comment PDF Files. Open any PDF file, add annotations and save all back to PDF in one single step. For desktop computers and Tablet PCs. - PDF Annotator	en	software-and-applications	robotsllmsaihumans	emailphone	none
filestage.io ↗	65 match shared topic	Filestage: Online Proofing Software – Free Trial & Demo	en	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
direnv.net ↗	65 match shared topic	direnv – unclutter your .profile \| direnv	en	software-and-applications	robotsllmsaihumans	emailphone	none
freepdfconvert.com ↗	65 match shared topic	Best PDF Converter: Create, Convert PDF Files Online (FREE)	en	software-and-applications	robotsllmsaihumans	emailphone	none
uploadcare.com ↗	65 match shared topic	File uploading, processing & delivery for web and mobile apps \| Uploadcare	en	software-and-applications	robots llmsaihumans	emailphone	none
print-conductor.com ↗	65 match shared topic	Batch Print Multiple PDF, Text, and Image Files with Print Conductor	en	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
sharefile.com ↗	60 match shared topic	Secure Document Workflow & File Sharing Software \| ShareFile	en	software-and-applications	robotsllmsaihumans	emailphone	none
smartvault.com ↗	60 match shared topic	SmartVault \| Document Management & Secure File Sharing Software	en	software-and-applications WordPress	robotsllmsaihumans	email phone	none
bokun.io ↗	60 match shared topic	Bókun: Booking Management Software for Tour & Activity Providers	en	software-and-applications WordPress	robotsllmsaihumans	emailphone	none
filezilla-project.org ↗	60 match shared topic	FileZilla - The free FTP solution	en	software-and-applications	robotsllmsaihumans	emailphone	none
hightail.com ↗	60 match shared topic	Secure file sharing & creative collaboration \| Hightail by OpenText	en	software-and-applications	robotsllmsaihumans	emailphone	none

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.