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Single-walled carbon nanotubes (SWCNTs) are ideal candidates for transparent conductive films (TCFs) due to their excellent optical transparency and electrical conductivity. The geometry of SWCNTs, including the tube diameter, bundle length and bundle diameter, is vital to high-performance TCFs. Herein, we synthesized SWCNTs by floating catalyst chemical vapor deposition (FCCVD). The SWCNT geometries were tuned by hydrogen (H 2), and we found that the tube diameter, bundle length and bundle diameter increase with the H 2 concentration. Besides, we observed the formation of SWCNT loop at the tube ends. Both the number and circumference of loops increased with the increment of bundle length. Further, the loops were also found to affect the conductivity of SWCNT thin film. Excessive number of loops with large size could reduce the conductivity of SWCNT thin film. At the optimized H 2 concentration, we obtained the SWCNT TCF with sheet resistances of 290 and 95 Ω/sq. for the pristine and AuCl 3 doped SWCNT films, respectively, at 90% transmittance. Our work demonstrates the importance of H 2 for SWCNT synthesis and the critical role of loops on film conductivity, blazing new ideas for future research to obtain SWCNT TCFs with improved performance. [Display omitted] • The geometry of SWCNT (i.e. tube diameter and length) is controlled by H 2. • As the length of SWCNT increases, the number and size of SWCNT loops increase. • The large proportion of the loops in SWCNT reduces the conductivity of TCFs. [ABSTRACT FROM AUTHOR]