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 (BlueskyX)

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

Preset Fixes

Custom Rules

Create New Rule

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