a 7 day extension of stay does not exist in Thailand.

If you apply for a new Extension of Stay and pay the 1.900 Thb but your application is not approved you will get a new stamp with 7 days to leave the country.

Example of the stamp:

@Jules ******

Yes, you have to talk with the Immigration Officer and make an official application.

TR M? I guess that is short for the Multiple Entry Tourist Visa.

Yes, each entry made with the Multiple Entry Visa gives you 60 days of stay and can be extended once with another 30 days based on tourism.

@Daniel ****

As long as the visa is valid, check the date valid until or enter before date ON the visa, you get 60 days on entry.

The Immigration of the airport works to stamp people in or out Thailand,

On Suvarnabhumi airport there is an office where you can apply for a Re-Entry Permit if you want to come back before your current stay ends.

Just tried it out and after making an account, log in and start to apply for a new visa.

I filled in as above but got this message, so clearly it does not work

Depending on your current stay inside Thailand and with 400.000 Thb in your bank account you can apply for:

Conversion into the Non Immigrant O visa based on marriage

Extension of Stay based on marriage and when that is stamped into the passport the Multiple Re-Entry Permit to travel during the year.

OR

Visit the Thai Consulate in HCMC Vietnam or Savannakhet Laos who issue the 1 year Multiple entry Non Immigrant O visa which gives you 90 days of stay on each entry.

IF you're inside Thailand using the Visa Exempt Entry or the Tourist Visa you can visit your local Immigration Office to apply for a conversion into the Non Immigrant B visa.

Yes, but no need to use the on-line websit.

Your Extension of Stay with the Re-Entry Permit are registered in the Immigration Database. Just using a new passport does not change your fingerprints, face, name, dob, gender, nationality etc, only change your passport number. It will be linked.

If you want to enter before 24 July you have to discuss with the Immigration Officer to use the NEW visa and not the Re-Entry Permit.