--- title: "Pinterest Uses Content Fingerprints for URL Deduplication Across Millions of Domains" url: https://daily.dev/posts/pinterest-uses-content-fingerprints-for-url-deduplication-across-millions-of-domains-ei0mkcqyt source_url: https://www.infoq.com/news/2026/06/pinterest-miqps-url-dedup type: article source: "InfoQ" published: 2026-06-08T14:45:14.988Z updated: 2026-06-08T14:45:35.576Z tags: ["backend", "distributed-systems", "pinterest"] reading_time: 3 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Pinterest Uses Content Fingerprints for URL Deduplication Across Millions of Domains **[InfoQ](https://daily.dev/sources/infoq)** · 3 min read · 0 upvotes · 0 comments ## Summary Pinterest engineers built MIQPS (Minimal Important Query Param Set), a data-driven URL normalization system that replaces manual allowlists and denylists for deduplication across millions of merchant domains. Instead of relying on canonical tags or hand-crafted rules, MIQPS renders pages and generates content fingerprints to determine whether removing a query parameter changes the underlying page content. Parameters that cause content changes above a threshold are retained; others are stripped. The system separates expensive offline analysis from lightweight runtime processing, applies anomaly detection to prevent regressions, and uses early-exit logic to minimize unnecessary page renders. This approach significantly reduces duplicate fetch, render, and indexing costs in Pinterest's large-scale content ingestion pipeline. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [How Pinterest Built a Real‑Time Radar for Violative Content using AI](https://daily.dev/posts/how-pinterest-built-a-real-time-radar-for-violative-content-using-ai-dd2rysw9z) · Pinterest Engineering · 1 upvotes · 0 comments - [Pinterest Product Case Study: Improving Discovery, Trust & User Experience](https://daily.dev/posts/pinterest-product-case-study-improving-discovery-trust-user-experience-yspikerv6) · Medium · 0 upvotes · 0 comments --- Tags: [#backend](https://daily.dev/tags/backend), [#distributed-systems](https://daily.dev/tags/distributed-systems), [#pinterest](https://daily.dev/tags/pinterest) [View this post on daily.dev](https://daily.dev/posts/pinterest-uses-content-fingerprints-for-url-deduplication-across-millions-of-domains-ei0mkcqyt)