Although he died at an early age, Schubert was tremendously prolific. He wrote some 600 Lieder, nine symphonies (including the famous "Unfinished Symphony"), liturgical music, operas, some incidental music, and a large body of chamber and solo piano music. Appreciation of his music during his lifetime was limited, but interest in Schubert's work increased dramatically in the decades following his death at the age of 31. Franz Liszt, Robert Schumann, Johannes Brahms and Felix Mendelssohn, among others, discovered and championed his works in the 19th Century. Today, Schubert is admired as one of the leading exponents of the Romantic era in music and he remains one of the most frequently performed composers.

Schubert was born in Himmelpfortgrund (now a part of Alsergrund), Vienna on January 31, 1797. His father, Franz Theodor Schubert, the son of a Moravian peasant, was a parish schoolmaster; his mother, Elisabeth Vietz, was the daughter of a Silesian master locksmith, and had also been a housemaid for a Viennese family prior to her marriage. Of Franz Theodor's fourteen children (one illegitimate child was born in 1783), nine died in infancy; five survived. Their father was a well-known teacher, and his school in Lichtental, a part of Vienna's 9th district, was well attended. He was not a musician of fame or with formal training, but he taught his son some elements of music.

At the age of five, Schubert began receiving regular instruction from his father and a year later was enrolled at his father's school. His formal musical education also began around the same time. His father continued to teach him the basics of the violin, and his brother Ignaz gave him piano lessons. At 7, Schubert began receiving lessons from Michael Holzer, the local church organist and choirmaster. Holzer's lessons seem to have mainly consisted of conversations and expressions of admiration and the boy gained more from his acquaintance with a friendly joiner's apprentice who used to take him to a neighboring pianoforte warehouse where he had the opportunity to practice on better instruments. He also played the viola in the family string quartet, with brothers Ferdinand and Ignaz on violin and his father on the cello. Schubert wrote many of his early string quartets for this ensemble.

Schubert first came to the attention of Antonio Salieri, then Vienna's leading musical authority, in 1804, when his vocal talent was recognized. In October 1808, he became a pupil at the Stadtkonvikt (Imperial seminary) through a choir scholarship. At the Stadtkonvikt, Schubert was introduced to the overtures and symphonies of Mozart. His exposure to these pieces and various lighter compositions, combined with his occasional visits to the opera set the foundation for his greater musical knowledge. One important musical influence came from the songs of Johann Rudolf Zumsteeg, who was an important Lied composer of the time, which, his friend Joseph von Spaun reported, he "wanted to modernize". Schubert's friendship with Spaun began at the Stadtkonvikt and endured through his lifetime. In those early days, the more well-to-do Spaun furnished the impoverished Schubert with manuscript paper.

Meanwhile, his genius began to show in his compositions. Schubert was occasionally permitted to lead the Stadtkonvikt's orchestra, and Salieri decided to begin training him privately in musical composition and theory in these years. It was the first germ of that amateur orchestra for which, in later years, many of his compositions were written. During the remainder of his stay at the Stadtkonvikt he wrote a good deal of chamber music, several songs, some miscellaneous pieces for the pianoforte and, among his more ambitious efforts, a Kyrie (D. 31) and Salve Regina (D. 27), an octet for wind instruments (D. 72/72a, said to commemorate the 1812 death of his mother), a cantata for guitar and male voices (D. 110, in honor of his father's birthday in 1813), and his first symphony (D. 82).

At the end of 1813, he left the Stadtkonvikt, and returned home for studies at the Normalhauptschule to train as a teacher. In 1814, he entered his father's school as teacher of the youngest students. For over two years, the young man endured the drudgery of the work, which he performed with very indifferent success. There were, however, other interests to compensate. He continued to receive private lessons in composition from Salieri, who did more for Schubert’s musical training than any of his other teachers. Salieri and Schubert would part ways in 1817.

In 1814, Schubert met a young soprano named Therese Grob, the daughter of a local silk manufacturer. Several of his songs (Salve Regina and Tantum Ergo) were composed for her voice, and she also performed in the premiere of his first Mass (D. 105) in September 1814. Schubert intended to marry Grob, but was hindered by the harsh marriage consent law of 1815, which required the ability to show the means to support a family. In November 1816, after failing to gain a position at Laibach, Schubert sent Grob's brother Heinrich a collection of songs, which were retained by her family into the 20th century.

Schubert's most prolific year was probably 1815. He composed over 20,000 bars of music, more than half of which was for orchestra, including nine church works, a symphony, and about 140 Lieder. In that year, he was also introduced to Anselm Hüttenbrenner and Franz von Schober, who would become his lifelong friends. Another friend, Johann Mayrhofer, was introduced to him by Spaun in 1814.

Significant changes happened in 1816. Schober, a student of good family and some means, invited Schubert to room with him at his mother's house. The proposal was particularly opportune, for Schubert had just made the unsuccessful application for the post of Kapellmeister at Laibach, and he had also decided not to resume teaching duties at his father's school. By the end of the year, he became a guest in Schober's lodgings. For a time, he attempted to increase the household resources by giving music lessons, but they were soon abandoned, and he devoted himself to composition. "I compose every morning, and when one piece is done, I begin another." During this year, he focused on orchestral and choral works, although he also continued to write Lieder. Much of this work was unpublished, but manuscripts and copies circulated among friends and admirers.

In early 1817, Schober introduced Schubert to Johann Michael Vogl, a prominent baritone twenty years Schubert's senior. Vogl, for whom Schubert went on to write a great many songs, became one of Schubert's main proponents in Viennese musical circles. He also met Joseph Hüttenbrenner (brother to Anselm), who also played a role in promoting Schubert's music. These, and an increasing circle of friends and musicians, became responsible for promoting, collecting, and, after his death, preserving, his work.