Galaxy fastq to fasta conversion gives coded output

I converted a 1 Gb fastq.gz file to fasta with Galaxy.
but the fasta file looks like this

OºÈ&»éyÚ½À‰2ìZruì)ÍRšåûjÏèþ¾îÙô%Ï/¯G3¨±Á‹õhokÍ"Í1ZóÑ2 ^¬^2
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I found the mistake. my fasta files were actually compressed. decompressing them solved the problem