🤖 Overview

Picsearch is an image-focused search engine operated by Picsearch AB, a Swedish company founded in 2000. Its primary purpose is to crawl the web for publicly available images and index them into a dedicated image search database, which powers both the picsearch.com website and licensed image search services for partners. According to official documentation on their website, the bot is designed to discover and catalog images at scale, supporting multimedia discovery rather than general web indexing.

🌐 Technical Behavior

The Picsearch crawler, commonly identified by the User-Agent string Picsearchbot/1.0, performs HTTP GET requests following standard web crawling protocols. It typically accesses robots.txt first, then fetches pages to extract tags and other image references. The bot operates from a range of IP addresses assigned to Picsearch AB in Sweden, though no public IP list is formally published. Crawl frequency is moderate but can become aggressive if a site contains many images — documentation notes that the bot respects standard crawl-delay directives in robots.txt. It uses HTTP/1.1 and supports gzip compression for efficiency. The bot does not execute JavaScript and only follows href links to discover new pages, meaning it relies on static HTML content.

📋 robots.txt Compliance

Picsearch explicitly states on its official site that it honors robots.txt Disallow directives. Evidence from numerous webmaster forums confirms that adding Disallow: / for User-agent: Picsearchbot effectively blocks all crawler access. The bot also respects Crawl-Delay if specified, making it one of the more compliant image crawlers in the industry.

🔍 Detection Indicators

The primary detection indicator is the User-Agent string Picsearchbot/1.0. Occasionally, older versions appear as Picsearchbot/2.0. The bot does not include custom headers like a referrer or proprietary tokens. Its IPs are typically geolocated in Sweden, registered under ASN 42831 (Picsearch AB). A behavioral fingerprint is its immediate request for robots.txt followed by page downloads without any session continuity, and it fetches image URLs directly rather than through embedded media.

📊 Data Usage

Collected image data — including alt text, surrounding page content, and image URLs — is used exclusively for building and updating the Picsearch image search index. This index is made publicly available on picsearch.com and also licensed to third-party applications for visual search. Picsearch does not use the data for AI model training, ad targeting, or any profiling beyond image retrieval.

⚙️ Rate Limiting Policy

Even though Picsearch is a legitimate bot, it is rate-limited because its crawl patterns can generate significant load, especially on image-heavy sites. The policy rationale for threshold-based blocking is to protect server resources and ensure fair access for human users, as an unchecked aggressive crawl could degrade site performance.

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