# How to close contigs file into one big contig

**URL:** <https://help.galaxyproject.org/t/how-to-close-contigs-file-into-one-big-contig/6503>\
**Category:** usegalaxy.org support\
**Tags:** assembly\
**Created:** [August 12, 2021, 9:39am UTC](https://help.galaxyproject.org/t/how-to-close-contigs-file-into-one-big-contig/6503 "2021-08-12T09:39:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![osman.merdan](https://avatars.discourse-cdn.com/v4/letter/o/7ab992/32.png) [@osman.merdan](https://help.galaxyproject.org/u/osman.merdan)\
**Post date:** [August 12, 2021, 9:39am UTC](https://help.galaxyproject.org/t/how-to-close-contigs-file-into-one-big-contig/6503/1 "2021-08-12T09:39:19Z")

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Hi everyone ,  
I want to submit a genome assembly to NCBI.  
I have contigs file but I don’t know how to merge all the contigs into one big contig using a refrence genome.  
Can you suggest a tool or a way to do such task