FASTA File Processor

Upload FASTA files to consolidate multi-line sequences into single lines and apply fixes. All processing happens in your browser—files never leave your computer.

What it does:

Consolidates multi-line nucleotide sequences into single lines
Handles files with multiple FASTA entries
Applies preset or custom search/replace rules
Combines multiple uploaded files into one output

Credits: Concept and ideas by Ryan Hisner (Bluesky • X)

📁 Upload FASTA File(s)

Click to select or drag files here • You can select multiple files to combine them

Preset Fixes

WA BA.3.2 artifactual frameshift

Search: CAATTTNNAAC → Replace: CAATTTAAC

WA BA.3.2 frameshift fix

Custom Rules

Create New Rule

Rule Name:

Search for:

Replace with:

Custom rules are saved in your browser and will appear here next time you visit.