Documents required for SBI PO Exam:

1. Photograph:
- Recent passport-sized color photograph.
- The photograph should be taken against a light-colored background and should be clear and of good quality.
- The dimensions of the photograph should be 4.5 cm x 3.5 cm.

2. Signature:
- Signature should be done on a white paper with a black ink pen.
- The signature should be clear and legible.
- The dimensions of the signature should be 140 x 60 pixels.
- The size of the signature should not exceed 10 KB.

3. Thumb Impression:
- Thumb impression should be taken on a white paper with black or blue ink.
- The dimensions of the thumb impression should be 140 x 60 pixels.
- The size of the thumb impression should not exceed 20 KB.

4. Handwritten Declaration:
- The declaration should be written in English on a white paper with black ink.
- The text of the declaration should be as follows: "I, [Candidate's Name], hereby declare that all the information submitted by me in the application form is correct, true, and valid. I will present the supporting documents as and when required."
- The declaration should be written in the candidate's own handwriting.
- The dimensions of the declaration should be 800 x 400 pixels.
- The size of the declaration should not exceed 50 KB.

Uploading the Documents:
- While filling the SBI PO application form online, there will be sections provided to upload the required documents.
- The documents should be scanned and saved in the required dimensions and file sizes mentioned above.
- The scanned copies of the photograph, signature, thumb impression, and handwritten declaration should be uploaded in the respective sections.
- Make sure that the scanned copies are clear and legible.
- After uploading the documents, preview the application form to ensure that all the uploaded documents are displayed correctly.
- If everything is in order, submit the application form.

Note:
- The exact specifications for the documents may vary slightly depending on the instructions provided by SBI for a particular year's exam.
- It is important to read and follow the instructions given in the official notification and application form for accurate and up-to-date information on document requirements.