View and prove documents for obtaining a UK visa

Use this service to verify official documents related to your UK visa application, including certificates of sponsorship and GWF reference numbers.

Check your Certificate of Sponsorship

If you were informed that your employer issued you a certificate of sponsorship, then you can check it by entering the CoS number of this document.

The Certificate of Sponsorship number is essential information for work visa applications in the Worker and Temporary Worker routes. A certificate of sponsorship, also known as CoS, is issued by a sponsor who is licenced to hire migrant workers. These documents are essential for those who apply for work visas in the UK.

Enter the CoS number of your sponsorship certificate in the search box to check information about the availability of the document. After confirmation, enter your GWF number for more information.

Assigned CoS numbers are valid for 3 months from the date of assignment. The format of a CoS reference number is a 14-character alphanumeric code — for example, X1BC2DE3FG45H6. If you are unsure whether your CoS is valid, enter the number below or contact the UKVI employer helpline.

Important

For example, X1BC2DE3FG4H5

Enter a CoS reference number

Check your GWF Number

After submitting an online application for a UK visa, you can check this document by number (GWF). Your GWF number is a unique number that is assigned to your UK visa application. The GWF number can be found on the visa application form submitted.

Enter the GWF number of your visa application in the search box to check information on document availability. Once confirmed, enter your passport number for more information.

Important

For example, GWF012345678

Enter a GWF reference number