Domain Name Extractor & Comparator
Last Updated: June 27, 2026
Extraction & Comparison Settings
Domain Name Extractor & Comparator
Paste URLs above, or upload .txt / .csv / .tsv / .log files.
Domains are extracted, normalized, and compared automatically.
Large dataset detected. Processing continues locally using optimized browser algorithms.
| # | Domain | Occurrences |
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| # | Domain | Occurrences |
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| # | Domain | Source |
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| # | Domain | Occurrences | Source |
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| TLD | Domains | Percentage |
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| Domain | Occurrences | Percentage |
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Your URLs and domains are processed entirely in your browser and never leave your device. Private SEO data stays private.
The fastest, smartest, privacy-first bulk domain extraction and comparison utility. Extract root domains from massive URL datasets, normalize them, and compare two lists instantly — all in your browser with no server uploads.
How To Use
Follow these simple steps to get started with domain name extractor & comparator.
Paste or upload URLs
Enter or paste URLs into List A (and optionally List B). Upload .txt, .csv, .tsv, or .log files, or drag and drop.
Configure extraction options
Toggle Strip Subdomains, choose whether to keep or remove duplicates within each list, and select CSV delimiter if needed.
View extracted domains
Domains are extracted instantly. The summary dashboard shows URLs parsed, domains extracted, shared domains, and unique per list.
Browse comparison tabs
Explore Shared Domains, Unique to A, Unique to B, Union, Duplicates, and Statistics tabs with virtualized tables and search.
Analyze and export
Review Domain Analytics for TLD breakdown and top domains. Export any tab as TXT, CSV, or JSON — all locally with no uploads.
Real-World Examples
Practical situations where domain name extractor & comparator helps solve real problems.
SEO Backlink Analysis
Extract root domains from backlink exports and compare competitor link profiles. Find shared backlink opportunities and unique linking domains.
Website Migration
Compare URLs from old and new sitemaps after a site migration. Extract domains to verify redirect coverage and identify orphaned URLs.
Competitor Research
Extract domains from competitor URL lists and compare against your own. Identify overlapping strategies and unique opportunities.
Security Log Analysis
Parse server logs and security audit exports to extract and compare domains. Identify anomalous external domains and track access patterns.
Why Use This Tool
Discover how this tool can improve your workflow and productivity.
Bulk Domain Extraction
Extract root domains from millions of URLs instantly using native URL parsing. Handles missing protocols, mixed schemes, and malformed URLs gracefully.
Smart Subdomain Handling
Toggle subdomain stripping on/off. Enable to normalize blog.example.com → example.com, or keep full hostnames for detailed analysis.
Enterprise-Scale Performance
Process 1,000,000+ URLs using Web Worker chunked processing. The UI stays fully responsive throughout with virtualized result rendering.
Dual-List Comparison
Compare extracted domains between two lists — find shared domains, unique to each list, combined unique, and duplicates. All results in linear O(N) time.
Complete Privacy
All URL parsing, domain extraction, and comparison happens locally in your browser via a Web Worker. No data leaves your device.
Rich Export Options
Export each result tab independently as TXT, CSV, or JSON. Also export domain analytics including TLD distribution and top domains.
Common Use Cases
Practical scenarios where this tool can help you get things done.
SEO Backlink Analysis
Extract root domains from backlink exports and compare competitor link profiles. Find shared backlink opportunities and unique linking domains.
Website Migration
Compare URLs from old and new sitemaps after a site migration. Extract domains to verify redirect coverage and identify orphaned URLs.
Competitor Research
Extract domains from competitor URL lists and compare against your own. Identify overlapping strategies and unique opportunities.
Security Log Analysis
Parse server logs and security audit exports to extract and compare domains. Identify anomalous external domains and track access patterns.
Marketing Campaign Analysis
Extract domains from campaign tracking URLs and compare across channels. Understand domain distribution in referral traffic.
Data Cleanup & Deduplication
Clean messy URL datasets by extracting normalized domains. Remove duplicate entries and identify domain-level patterns across large exports.
Tool Summary
Quick facts about this tool at a glance.
What Is Domain Name Extractor & Comparator?
A Domain Name Extractor & Comparator is a browser-based utility that extracts root domains from URLs using native JavaScript URL parsing, normalizes them (strip subdomains, trailing slashes, fragments, query strings, ports), and compares two domain lists using O(N) Set-based algorithms. It supports 1,000,000+ URLs via Web Worker chunked processing, provides domain analytics (TLD distribution, top domains), and exports results as TXT, CSV, or JSON — all processed locally with zero data uploads.
About This Tool
A Domain Name Extractor & Comparator is an essential utility for SEO professionals, digital marketers, cybersecurity analysts, and web developers who work with bulk URL datasets. Extracting and normalizing root domains from thousands or millions of URLs is a common task in backlink analysis, website migration, security auditing, and competitive research — but doing it manually is impractical.
How Domain Extraction Works
The tool uses the browser's native JavaScript URL API (new URL(url).hostname) to extract hostnames from URLs. It handles URLs with and without protocols, gracefully falls back for malformed input, and applies a comprehensive normalization pipeline: (1) normalize line endings and remove invisible characters, (2) normalize Unicode (NFC), (3) trim whitespace and collapse spaces, (4) prepend https:// to URLs without schemes, (5) parse each URL using the URL API, (6) extract hostname from parsed URL, (7) remove trailing dots, (8) lowercase the domain, (9) optionally strip subdomains to extract the root domain, (10) remove trailing slashes, fragments (#), query strings (?), and ports from hostnames.
Root Domain vs Full URL
A full URL contains the protocol (https://), subdomain (www), domain (example), TLD (.com), path (/page), query (?id=1), and fragment (#section). The root domain (also called registrable domain) is just the domain name plus TLD: example.com. Extracting root domains strips all structural components except the registrable domain, enabling domain-level comparison regardless of URL structure.
Subdomain Stripping
The tool uses a heuristic based on the number of dot-separated labels in the hostname. For standard TLDs (.com, .org, .net, etc.), root domains have exactly 2 labels (example.com) — anything with more labels is treated as having a subdomain. For two-part TLDs (.co.uk, .com.au, .github.io), the tool checks against common public suffix patterns to correctly identify the registrable domain.
Privacy-First Processing
All URL parsing, domain extraction, normalization, and comparison happens locally in your browser using a dedicated Web Worker. Backlink exports, client websites, internal URLs, security audit logs, and proprietary research data never leave your device. The tool works fully offline after the initial page load.
Who Should Use This Tool
SEO professionals extract root domains from backlink exports to analyze linking domain profiles and compare competitor backlink strategies. Digital marketers normalize and compare URL datasets across campaigns and channels. Cybersecurity analysts parse server logs to identify anomalous external domains. Web developers extract domains during website migrations and redirect audits. Data analysts deduplicate and normalize URL datasets for reporting.
Quick Summary
This free Domain Name Extractor & Comparator extracts root domains from URLs and compares two domain lists entirely in your browser. Paste or upload URLs into List A and List B — the tool automatically extracts root domains using native URL parsing, normalizes them (strip subdomains, trailing slashes, fragments, query strings, ports), and compares using O(N) Set algorithms. Features include Strip Subdomains toggle (ON by default), duplicate handling, CSV delimiter detection, and search/filter per tab. The summary dashboard shows URLs Parsed, Domains Extracted, Shared Domains, Unique to A, Unique to B, Duplicates Removed, and Processing Time. Result tabs: Shared Domains (intersection), Unique to List A (difference), Unique to List B (difference), Combined Unique (union), Duplicate Domains, and Statistics. Domain Analytics tab shows TLD distribution (.com, .org, .net, .io, .co.uk, .ai) with counts and percentages, top domains by frequency, and domain frequency analysis — all exportable. Export any tab as TXT, CSV, or JSON. The tool uses a Web Worker for processing 1,000,000+ URLs without freezing the UI. All data stays local — no uploads, no servers, complete privacy.
Related Concepts
Explore related terms and topics associated with domain name extractor & comparator.
Frequently Asked Questions
Common questions about domain name extractor & comparator.
How do I extract root domains from a massive list of raw URLs?
Paste or upload your URLs into List A. The tool automatically extracts root domains using native JavaScript URL parsing. It handles missing protocols, mixed schemes (HTTP/HTTPS/FTP), and malformed URLs. Toggle Strip Subdomains ON to normalize blog.example.com to example.com. Results appear instantly with summary statistics.
Can I compare extracted domains against competitor backlinks?
Yes. Paste your backlink URLs in List A and competitor backlinks in List B. The comparison tabs show Shared Domains (intersection), Unique to List A, Unique to List B, Combined Unique (union), and Duplicate Domains. Use this to identify overlapping and unique linking domains between any two datasets.
Are subdomains and query strings removed automatically?
By default, the tool strips subdomains (blog.example.com → example.com), removes trailing slashes, strips fragments (#), strips query strings (?), normalizes case, and removes ports. The Strip Subdomains toggle lets you keep full hostnames when needed for subdomain-level analysis.
Is my SEO data safe?
Yes. All URL parsing, domain extraction, and comparison happens locally in your browser using a Web Worker. Your data is never uploaded, stored on servers, transmitted over the network, or logged. The tool works fully offline after the initial page load — providing verifiable privacy for sensitive SEO datasets including backlink exports, client websites, and proprietary research.
Can the tool process millions of rows?
Yes. The tool supports 1,000,000+ URLs using Web Worker chunked processing. A progress indicator shows rows processed during large operations. The UI remains responsive throughout, and results use virtualized rendering to handle large output sets. A large dataset notice appears for sets exceeding 100,000 URLs.
What is the difference between a full URL and a root domain?
A full URL contains the protocol (https://), subdomain (www), domain (example), TLD (.com), path (/page), query (?id=1), and fragment (#section). A root domain is just the registrable domain: example.com. Extracting root domains strips everything except the domain and TLD, making it possible to compare websites at the domain level regardless of URL structure.
Can I export matched domains?
Yes. Each result tab (Shared, Unique to A, Unique to B, Union, Duplicates) can be exported independently. Use Copy to clipboard, Download TXT, Download CSV, or Download JSON. Filters and search are applied before export — only visible results are exported.
Does it support malformed URLs?
Yes. The extraction engine gracefully handles URLs without protocols (example.com/page), with missing schemes, with mixed case, with extra whitespace, with Unicode characters, and with various encodings. Invalid inputs that cannot be parsed are reported in the statistics section.
Can I keep subdomains?
Yes. Toggle the Strip Subdomains setting OFF to keep full hostnames intact. When OFF, blog.example.com stays as blog.example.com instead of being normalized to example.com. This is useful for subdomain-level analysis, CDN mapping, and detailed hostname audits.
What domain analytics are available?
The Domain Analytics tab shows unique domain count, duplicate domain count, most common TLDs (.com, .org, .net, .io, .co.uk, .ai, etc.) with counts and percentages, top domains by frequency, domain frequency distribution, and TLD breakdown — all exportable as CSV.
What is a public suffix and why does it matter?
A public suffix is a domain under which independent entities can register subdomains (like .com, .co.uk, .github.io). The tool uses an algorithmic approach based on dot-count heuristics to distinguish registrable domains from subdomains. For example, in 'myblog.blogspot.com', the registrable domain is 'blogspot.com' because 'blogspot.com' is a known public suffix pattern.
Can I compare extracted domains against a list of known domains?
Yes. Paste your extracted domains in List A and your known domains in List B. The comparison engine runs in O(N) time using Set-based algorithms for instant intersection, difference, and union. Results are displayed in separate tabs with counts and export support.
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Reviewed by FreeDeskTools Editorial Team
Domain Name Extractor & Comparator has been reviewed for accuracy, usability, privacy, and browser-side performance. FreeDeskTools tools are designed to run locally whenever possible, helping users complete tasks quickly without unnecessary data collection.
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