On September 9, 2011, he uploaded HolaSoyGerman's first video titled
Las cosas obvias de la vida (lit. "The obvious things in life"). The videos on the channel consisted of humorous monologues talking about everyday life situations. In an interview with
BBC Mundo, he stated that "The humor I do on YouTube is quite innocent. I've always liked making people laugh by making fun of myself, never of others." In 2013, he created another YouTube channel called JuegaGerman, where he mainly uploads gameplay videos and other content. A Spanish YouTuber named YoLordestructor uploaded a video accusing him of using
bots to artificially boost his subs. He cite a deleted video from HolaSoyGerman,
Internet y Redes Sociales, in which it displayed various websites marked as AddSocials, YouLikeHits and SocialClump, which are allegedly for using bots. Days later, he uploaded another video in which he accused Germán of having deleted his previous video due to copyright claims. Later, other YouTubers such as the Mexican Diego de La Mattaz known as Diego Mexivergas and the Chilean Xodaaa uploaded videos giving the accusations as true. On August 24, 2013, he uploaded a video responding to these accusations, claiming they were false, which racked up over four million views before being removed. In that same year, he uploaded the HolaSoyGerman most popular video titled L
os Hermanos. At the end of 2013, through his channel HolaSoyGerman, which by then had 12 million subscribers, he became the YouTuber with the second most subscribers, only behind
PewDiePie, according to data provided by
YouTube Rewind. In August 2014 he won the "Digital Icon" category from
MTV Millennial Awards. In April 2014, he was scheduled to appear at the
Telmex Aldea Digital in
Zócalo, Mexico City. The event had many problems, the talk he gave did not have a good sound, the tent was filled with many more people than it could bear. People pushed each other and those who tried to enter were injured. After the Secretary of Public Security of the Government of the Federal District regained control of the situation, the crowd dispersed and the event was cancelled. In 2015 he went together with
El Rubius and other YouTubers to the Club Media Fest. In October 2015,
Jack Black appeared in a video titled
Tipos de alumnos () to publicize the movie
Goosebumps. In March 2016, the Canadian rock band,
Simple Plan was featured in the intro of a video entitled
La Comida. In April 2016, he would reach 10 million subscribers in his two main channels HolaSoyGerman and JuegaGerman, which led him to be the first YouTuber to obtain two
Diamond plates. In June 2016, he won the category "Master Gamer" from MTV Millennial Awards, at the Pepsi Center WTC in
Mexico City. On November 20, 2016, he uploaded their last HolaSoyGerman video,
Como Encontrar Trabajo. In a JuegaGerman video titled
Esto pasa si busco mi nombre en YouTube, he explained that the reason for this decision was due to the extensive process that each video on that channel required for him to create, stating that sometimes it took more than 22 hours. This statement was in response to a Spanish YouTuber who accused him of taking drugs to make his videos. By 2018, he was the fifth most popular YouTuber on the platform. In August 2018 he won in the Favorite Gamer category of the
Mexico Kids' Choice Awards. In September 2018, the Facebook page Paradero UAH posted a two-minute excerpt from a JuegaGerman video from August 30, 2014, titled
OH POR DIOS, SOY EMO, in which while playing
Beyond: Two Souls, he begins to say comments that were branded as misogynistic, disgusting and sexist. The clip became viral through social networks. In 2019, his HolaSoyGerman channel, which until then had 37 million, was in a confrontation for being the Spanish-speaking channel with the most subscribers worldwide with the Mexican company
Badabun, who would end up surpassing him in subscribers that same year. In 2020, JuegaGerman reached 40 million subscribers and, in October of the same year, surpassed HolaSoyGerman. In October 2021, he won the Legend Award at the Eliot Awards for his long history on YouTube. In May 2022, JuegaGerman surpassed Badabun in subscribers. In 2023, he won the Best Lifetime Achievement category at the
Premios ESLAND, hosted by Spanish YouTuber
TheGrefg. On September 26 of the same year, Garmendia set himself a challenge, which was based on having the
short with the most comments on the YouTube platform, the video "NECESITO TU AYUDA" (lit. I NEED YOUR HELP), until August 2024 he managed to position himself in seventh place. In April 2024, HolaSoyGerman's channel was hacked, alarming its fans, but thanks to YouTube's moderation, the channel was able to quickly recover. On May 16, 2024, JuegaGerman reaches 50 million subscribers, becoming the first Spanish-language channel to achieve this, which in turn made him the first Hispanic YouTuber to obtain the
Ruby Play Button. Long after this achievement, he lost the position of most subscribed Hispanic creator against
Fede Vigevani. That same year, Garmendia gave more priority to
shorts, uploading many of these which quickly became very viral, until December 2024 this format represented 15% of the total views of the JuegaGerman channel. In 2025, in a short titled "¿Cuál fue mi PRIMER comentario?" (lit. What was my FIRST comment?). He quickly showed his Ruby Play Button, and then in a video titled "Rompiendo RÉCORDS Mundiales FÁCILES" (lit. Breaking EASY World RECORDS), he showed his 50 Million button again, thanking for the award and the support. == YouTube Channels ==