As you said that you want to apply for Personal Loan at HDFC Bank so below I am providing you all the details about this Loan which also include eligibility criteria

Eligibility Criteria
You are eligible for HDFC Bank personal loan if:
-You are between 21 and 60 years of age
-In case you are salaried, you are in a full time job for at least 24 months of which not less 12 months must be with your current company
-In case you are self-employed, you must be in current profession or business for at least 4 years and should preferably be owning either your office or your place of residence. Minimum turnover and minimum net income criteria may apply
-HDFC Bank does not specify any particular CIBIL score for being eligible for a personal loan, it is observed that a score of 750 and above is desirable

Documents required - Salaried
-Filled up loan application form
-2 Passport Size Photo
-Copy of Income Tax PAN
-Identity Proof - Passport/ Driving Licence/ Voter ID/ PAN
-Residential Address Proof - Leave and License/ Registered Rent Agreement/ Utility Bill (upto 3 months old), Passport
-Income Documents – 3 months payslip, 2 years Form 16, 3 months bank statement showing salary credit and any EMI debit

Documents required - Self-Employed
-Filled up loan application form
-2 Passport Size Photo
-Copy of Income Tax PAN
-Identity Proof - Passport/ Driving Licence/ Voter ID/ PAN
-Residential Address Proof - Leave and License/ Registered Rent Agreement/ Utility Bill (upto 3 months old), Passport
-Income Documents – 2 years audited financials, 6 months bank statement
-Business proof such as VAT/ service tax registration, incorporation details in case of companies, business address proof