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Custom Gene Entry
Enter sequence with valid length & screen for complexity to continue.
Minimum sequence length: 25
Total Complexity Score:
Please reduce complexity or remove these to proceed to your order and we can take on even more challenging sequences by manually reviewing through our SynBio Custom Solutions! Email it to and we’ll take a closer look.
Attention: items on this order, where applicable, may be subject to sequence verification via Next Generation Sequencing (NGS), and not Sanger sequencing.
If you have any questions or need further assistance with your Custom Gene design, please contact us.
Change All Vectors
item(s) will be updated.
January 21, 2026: Complexity allowance increased again! Scores up to accepted today with more expansion on the way.
IDT Can Now Support More Complex, Longer Genes!
By combining traditional chemical synthesis with next‑generation enzymatic technology, IDT can now deliver a broader range of gene designs.
Through our partnership with Ansa Biotechnologies™, you can now order genes up to 7,500 bp with sequence complexity scores up to , directly on the web.*
How to Access This New Offering
- Enter your sequences in the text boxes or via Bulk Input.
- Screen for sequence complexity—individually (“Screen Sequence Complexity”) or all at once (“Screen All & Order”).
- Select vectors for each gene.**
- Review results, add items to your cart, and check out.
For more details, visit the product page.
* Accepted sequence length and complexity will continue expanding as Ansa's platform is further integrated. For higher‑complexity designs and genes up to 50,000 bp, contact .
** Custom vectors and add‑on services (scale‑up, glycerol stock) are not yet available in this workflow.
Bulk Input
| Tab/Excel: | Name Sequence |
| Comma: | Name,Sequence |
| Semicolon: | Name;Sequence |
| FASTA: | >Name Sequence |