Pietsch attended the Danzig art and vocational school, and in 1841–1843 the Berlin Art Academy; he also studied under Swiss painterCharles Gleyre in Paris. He worked as an illustrator for various newspapers and journals, including the well-known Leipzig Illustrirte Zeitung. His articles in the Vossichte Zeitung and the Spenersche Zeitung started to appear in 1864, and he later contributed to the BreslauSchlesische Zeitung where he served as a chief feature writer for a period, as well as the periodical Grenzboten, published by Gustav Freytag and Julian Schmidt and the Berliner Allgemeine Zeitung. He reported on Berlin's social events such as the annual Presseball, and was its most important and gifted fashion critic, much to his own embarrassment. He also reported on his own travel experiences, art and handicraft exhibitions, and served as a companion to the Crown Prince Frederich in the Franco-German war of 1871. He was given an honorary title of Professor for his 70th birthday. Pietsch was reputed to be a tireless socialite well into his old age. He associated daily with actors, artists and politicians, and had an intimate knowledge of Berlin's social scene, cafes, restaurants and balls, and was much admired by his female readers. Pietsch harnessed his Christmas Eve birthday to celebrate the whole day, starting at midnight. Alfred Kerr wrote of Pietsch:
He is a daredevil, shrugging off his seventy years, and draws in all the joie de vivreto live life to the full. He has hardly given up hope for women, and he is even dangerous in their presence. He appears at every notables' banquet, every premiere, and at the opening of every show.
Pietsch was a talented painter who withdrew from his easel with his imperious talents into society. He was the confidant of houses where art was loved. Humorous and gallant, he chatted about everything having to do with old families and new images, exhibitions, on the dresses of the ladies, suppers, and studio visits.
Aus Welt und Kunst : Studien und Bilder. Jena : Costenoble, 1867
Von Berlin bis Paris. Kriegsbilder . Berlin 1871
Nach Athen und Byzanz. Ein Frühlingsausflug. Berlin: Janke 1871
Orientfahrten eines Berliner Zeichners. Berlin: Janke 1871
Marokko. Briefe von der deutschen Gesandtschaftsreise nach Fez im Frühjahr 1877. Leipzig: Brockhaus 1878
Wallfahrt nach Olympia im ersten Frühling der Ausgrabungen nebst einem Bericht über die Resultate der beiden folgenden Ausgrabungs-Campagnen. Reisebriefe. Berlin: Luckhardt 1879
Andreas Achenbach. Breslau 1880
Paul Meyerheim. Breslau 1881
Die deutsche Malerei der Gegenwart auf der Jubiläums-Ausstellung der Königlichen Akademie der Künste zu Berlin 1886. München: Hanfstaengel 1886
Die Malerei auf der Münchener Jubiläums-Kunst-Ausstellung 1888. München: Hanfstaengel 1888–1889
Ludwig Pietsch: Wie ich Schriftsteller geworden bin. Der wunderliche Roman meines Lebens.
*Volume 1: Erinnerungen aus den Fünfziger Jahren. Berlin: Fontane 1893.
*Volume 2: Erinnerungen aus den Sechziger Jahren. Berlin: Fontane 1894.
*Newly edited by Peter Goldammer, Berlin: Aufbau-Verlag 2000.
Aus jungen und alten Tagen. Memoirs. Berlin : Fontane 1904