generate a random nucleotide sequence

generate a random amino acid sequence

calculate molecular weight of DNA, RNA or protein from sequence

protein mw calculator, protein kilodaltons

random dna sequence generation

random dna sequences

scrambled sequence tool

reverse text tool

reverse string tool

tool to shuffle letters

random nucleic acid

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Random Sequence Generator

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Sequence Output
a ⇨ A
A ⇨ a
Calculate MW
Select All
Reverse Complement


DNA RNA protein


GC content (%):


Additional formatting of the sequence

Format Output
Clean Sequence

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DISCLAIMER: This free software comes without any warranty. The author of the software bears no responsibility for any loss or damage that may arise from its use for any purpose.


Attempts to generate very long sequences (e.g. a million characters or longer, depending on user's computer performance) may make the web browser jerky or even frozen. Significant time (a second per each 100,000 characters or so, depending on computer) will be required to complete such tasks.



By default, the generated sequence contains no line breaks (it is one line text even though it is displayed as a justified block). To truly justify the sequence into a text block, regularly spaced line breaks must be inserted. This is done by the "Format Output" operation (if set to do so). The "Clean Sequence" operation will do just the opposite, i.e. remove all numbers, spaces, and line breaks to get a one-line sequence.
The "Format Output" and "Clean Sequence" functions will also process any external sequence pasted in the Sequence Output field.