Gene ID Converter + Human–Mouse Orthologs

Paste a gene list to convert between Symbol, Ensembl ID and Entrez ID, update outdated gene names, and get human ↔ mouse orthologs.

Everything runs locally in your browser. Pasted data is never uploaded to any server.

1. Paste genes

2. Options

Species of the input genesAlso give the orthologs in the other speciesList all orthologs for one-to-many genes (default keeps only the best: same-name first, else most supported)

3. Result

Paste some genes first, or click “Load example”.

“Old name → current”: many genes have been renamed (e.g. SEPT1 → SEPTIN1, MARCH1 → MARCHF1); outdated names are replaced by the current official symbol.
“Ambiguous”: an old name or alias maps to several genes; each candidate gets its own row, so you can decide.
“Excel date repaired”: Excel turns names such as SEPT1, MARCH1 and DEC1 into dates like “1-Sep”; they are restored here. The original file is already damaged, so save gene lists as text in future.
The “Relation” column: 1:1 one-to-one; 1:n one gene has several orthologs; n:1 several genes share one ortholog; n:n many-to-many. It always describes the full relation, even if only the best ortholog is shown.
Orthology is an integrated computational call, fine for most expression analyses; for a gene your paper hinges on, double-check in HGNC / MGI. Only human and mouse are supported.

Gene names in a whole table turned into dates by Excel?Check and repair them with “Excel Turned Gene Names into Dates? Find and Fix Them”