Index collision checker

Check a pool of Illumina indexes

Provide barcodes, set the minimum Hamming distance, then inspect duplicates, collisions, and unique-dual failures before you export.

Index table

Files are parsed in your browser and are not sent to our servers. Use sample_id, index (i7), and optional index2 (i5). Paste oligo bases such as ATCACGTT, not catalog IDs such as D701. Illumina sample-sheet Data sections are accepted.

Choose file

Or paste indexes

Minimum Hamming distanceTruncate to index-read lengthFlag reverse-complement collisions (i5 orientation mix-ups)Require unique dual indexes (no shared i7 or i5)