Welcome to Tandem Repeats Finder

To get started, choose a tab above. This website offers:

October 20, 2022:
TRF website has been redesigned and modernized using python and flask software.

June 28, 2020:
TRF software is now open source. Code and executable versions are available on Github. See tabs above.

Feb 22, 2016 update:
TRF Version 4.09 released. This version fixes issues with centromeres in HG38. See a full list of changes on the What's New tab.

Please cite:
G. Benson,
"Tandem repeats finder: a program to analyze DNA sequences" (link)
Nucleic Acids Research (1999)
Vol. 27, No. 2, pp. 573-580.

A tandem repeat in DNA is two or more adjacent, approximate copies of a pattern of nucleotides. Tandem Repeats Finder is a program to locate and display tandem repeats in DNA sequences. In order to use the program, the user submits a sequence in FASTA format. There is no need to specify the pattern, the size of the pattern or any other parameter. The output consists of two files: a repeat table file and an alignment file. The repeat table contains information about each repeat, including its location, size, number of copies and nucleotide content. Clicking on the location indices for one of the table entries opens a second web browser that shows an alignment of the copies against a consensus pattern. The program is very fast, analyzing sequences on the order of .5Mb in just a few seconds. Submitted sequences may be of arbitrary length. Repeats with pattern size in the range from 1 to 2000 bases are detected. Sequence information sent to the server is confidential and deleted after program execution. Example of output.

This material is based upon work supported by the National Science Foundation under Grant No. CCR-9623532

Last revised October 20, 2022
Send any questions or comments to:
Gary Benson