Hosting over 5 million images as of August 2025, the website is owned by Jan "Varka" Mulders, who is also the CEO of sex toy manufacturer Bad Dragon. e621 also maintains a safe for work (SFW) mirror site called e926, which runs on the same servers and thus maintains the same adults-only restriction e621 has. e621 is among the most-visited furry websites, alongside the art community FurAffinity.
Overview
e621 is a furry-themed booru-style imageboard: a gallery in which images, largely digital art, are categorized with tags. While e621 allows for both safe for work and not safe for work content, furry pornography—known as yiff—is the website's largest collection; it is also for what e621 is best known.[1][2][3] In this way, users can utilize the tagging function to search for artwork containing particular fetishes or kinks.[4] e621 also hosts other forms of artwork, such as kemonomimi, Pokémon, and ponies from the animated children's TV series My Little Pony: Friendship Is Magic (the erotic art of which is known as clop).[5][6][7]
Over 82,469 images on e621 were tagged My Little Pony by 2015;[7] by 2017, the number of such images had nearly doubled to 147,037.[6] Since 2011, Twilight Sparkle has been the most frequently tagged character, reaching 33,792 tagged images by March 2023.[8][bettersourceneeded]As of September 2025[update], Twilight Sparkle is the most frequently tagged character on e621 with over 38,000 images; Judy Hopps from Zootopia has the second most tags with over 37,500 images. Fluttershy and Rainbow Dash are the third and fourth most tagged characters, respectively.[‡ 2]
On March 5, 2020, e621 released its source code under the terms of the 2-clause BSD license. The site is a heavily-modified fork of the Danbooru anime-focused imageboard, and uses the Ruby on Rails framework.[‡ 3]
As of January 2024, e621 had almost 4 million images.[1] The website is owned by Jan "Varka" Mulders, who is also the CEO of sex toy manufacturer Bad Dragon.[9] The website also contains a discussion forum and a wiki for its tags, as well as a safe for work (SFW) mirror site called e926.[10] As of February 2025, AI-generated art or AI-assisted art is generally banned from being posted on e621 with exceptions for backgrounds, artwork that references, but does not directly use, AI-generated content, and for audio for video posts.
On December 21, 2023, access to e621 was blocked in Russia by the Russian censorship agency Roskomnadzor. Officially, this was due to the site allegedly hosting numerous pornographic illustrations depicting minors.[11]
e621 is among the most-visited furry websites, alongside FurAffinity.[1][13] A 2017 survey of attendees at Anthrocon—an annual furry convention in Pittsburgh, Pennsylvania—conducted by the International Anthropomorphic Research Project found that e621 was the 8th most-visited "furry-themed" website listed by participants.[14]
↑ Required to upload content, view blacklisted content, edit the wiki and content tags, and post comments, "blips", and forum posts.
↑ The most common pronunciations of the site's name are "ee-six-two-one" and "ee-six-twenty-one" (likewise, "ee-nine-two-six" and "ee-nine-twenty-six" for e926), though according to one of the site's administrators, "The proper way is ee-six-two-one. Sounding out each letter and number."[‡ 1] Collectively, both sites may also be referred to simply as eSix or e6.
↑ Arčon, Artur Quaglio (2020). "Olhar exploratório sobre a subcultura furry no Brasil"[Exploratory look at the furry subculture in Brazil]. Revista Iniciacom (Brazilian Journal of Scientific Initiation in Communication) (in Portuguese). 9 (1). Brazilian Society for Interdisciplinary Communication Studies: 1. Retrieved August 24, 2024.
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