CDS Application: Documents Required, Photo Size & Signature Checklist

Most CDS applications get rejected not because of poor eligibility, but because of a blurry photograph, a mismatched signature file, or a missing attestation on a certificate. The UPSC OTR portal has strict, non-negotiable upload rules, and a single spec error triggers instant rejection with no warning about what went wrong. Getting the CDS application documents photo size and format exactly right before you submit is the only way to avoid that outcome.

This checklist covers every document you need, the precise photo and signature specifications mandated by UPSC OTR, the most common rejection triggers, and a step-by-step fix if your upload fails. Everything here applies to the CDS 2026 and 2027 exam cycles.

CDS Application Documents Checklist 2026: 2027

The CDS application form 2026 requires candidates to keep a specific set of documents ready before they begin filling the form on the UPSC OTR portal. Document readiness refers to having each certificate verified, clearly scanned, and formatted to UPSC's stated requirements before you open the registration page.

The Combined Defence Services examination notification specifies the following core documents for all applicants:

• Identity proof (UPSC-accepted) , Aadhaar card, passport, or voter ID; this serves as your primary identity proof UPSC cross-checks during verification

• Educational qualification certificate , degree certificate or provisional certificate from a recognized university confirming graduation eligibility

• Age proof , matriculation or secondary school certificate issued by a recognized board

• Domicile certificate , mandatory only for OTA Chennai applicants

• NCC certificate , applicable if claiming NCC eligibility benefit; must state the correct NCC grade

When checking CDS application documents photo size alongside paperwork, treat both as equally critical. Missing even one document causes the form to be flagged. UPSC processes over 4 lakh CDS applications each cycle, and incomplete submissions are rejected without exception. Keep your CDS signature upload specifications note handy as you gather these files.

CDS Application Photo Specifications (UPSC OTR Guidelines)

Getting your photo right on the One-Time Registration portal is the step most applicants underestimate until their upload fails. UPSC OTR photo specifications are non-negotiable: submit exactly what the system expects, or the application stalls.

Here are the confirmed photo requirements for the CDS application form 2026, as prescribed in UPSC's official OTR photo and signature upload guidelines:

• File format: JPEG only

• File size: Minimum 3 KB, maximum 300 KB

• Dimensions: Width 350 pixels, height 350 pixels

• Background: White or plain light-coloured background

• Face coverage: Face must occupy 50 percent or more of the frame

• Recency: Photograph must be recent, ideally taken within the last six months

• DPI scan requirement: If scanning a printed photo, scan at a minimum of 200 DPI to preserve clarity

Wearing spectacles, caps, or using flash that creates shadows behind the head are all grounds for an UPSC OTR photo rejected fix request. Are your photo dimensions exactly 350x350 pixels before you upload? Verify this in any image editor before proceeding.

CDS Signature Upload Specifications for UPSC OTR

Your signature file is as scrutinised as your photograph on the UPSC OTR portal, and getting the specs wrong at this stage will stall your entire CDS 2026 submission. Sign on plain white paper using black ink only. Scan or photograph that signature against a white background before uploading.

The exact upload requirements are:

• File format: JPEG format upload only (no PNG, PDF, or BMP accepted)

• File size: Between  20 KB - 100 KB

• Dimensions:350 - 500 pixels (width × height)

• Background: White or very light, with no shadow or smudging around the ink strokes

• Ink colour: Black ink strictly; blue or gel-pen signatures are rejected

Unlike the photo, there is no recency requirement stated for the signature, but it must clearly match the name on your nationality proof CDS document and all other CDS documents required for the application. A digital signature typed in a font is not acceptable under any circumstance.

Refer to the UPSC OTR official photo and signature specifications page to confirm these figures before you upload.

Why UPSC OTR Rejects CDS Photos & Signatures: And How to Fix It

Most rejections on the UPSC OTR portal trace back to a handful of preventable errors. Understanding exactly why the system flags an upload is the fastest way to fix it before the CDS application form 2026 deadline closes.

• File size out of range: Photos must fall between 20 KB and 300 KB. Anything below or above this range triggers an automatic rejection regardless of visual quality.

• Background is not white or off-white: The OTR system requires a white background photograph. Coloured walls, studio gradients, and outdoor backgrounds all cause rejection.

• Digital signature submitted: CDS signature upload specifications require a physical signature in black ink on plain white paper, then scanned. A stylus-drawn or typed signature is not accepted.

• Wrong file format: Only JPEG or JPG files are accepted. PNG, PDF, or BMP uploads fail at the portal validation stage.

• Image dimensions outside limits: Photos must meet the specified pixel dimensions; cropped or stretched images distort the face-coverage ratio and are rejected.

To fix a rejected upload, log back into OTR, navigate to the photo or signature section, and re-upload a corrected file. Candidates attaching supporting documents such as an NCC certificate eligibility proof should also verify that scanned copies meet the same JPEG and file-size standards applied to the CDS application documents photo size requirements.

Common Eligibility Document Errors in CDS Application (Avoid These)

Even candidates who meet every eligibility criterion can face form rejection because of avoidable document errors. These mistakes often surface only after submission, which is why knowing them in advance saves significant time.

• Name mismatch across documents: Your name on the 10th certificate, degree certificate, and OTR profile must match exactly. Even a middle name abbreviation can trigger rejection. Fix: use a gazette notification or affidavit to standardise the spelling across all records.

• Provisional degree certificate not accepted in certain cases: UPSC accepts provisional certificates for eligibility, but they must clearly state the course and year of passing. A simple marksheet is not a substitute.

• Wrong age proof document: Only the date of birth as recorded in the matriculation or secondary school leaving certificate is accepted. Aadhaar alone is not valid proof.

• Missing OTA domicile certificate: Female candidates applying for the Officers Training Academy must submit a domicile or nativity certificate. Skipping this is one of the top three document-stage errors recorded on the portal.

• Unattested photocopies: Supporting documents that require attestation but are submitted as plain photocopies are rejected outright at the document verification stage.

• Scanned signature black ink requirement ignored: Some candidates submit signatures made with blue or gel ink. UPSC requires black ink on white paper. Similarly, UPSC OTR photo specifications mandate a plain white or light background; coloured or studio-gradient backgrounds trigger automatic flags.

If your uploaded file is flagged, use the UPSC OTR photo rejected fix workflow: log into your OTR account, navigate to the photo and signature section, and re-upload a correctly formatted file before the form is finally submitted. Once the application is submitted and the window closes, corrections are not permitted.

FAQs

What is the exact photo size for the CDS application 2026 on UPSC OTR?

Your photo must be in JPEG format with a file size kilobytes range of 20 KB to 300 KB. Dimensions should be approximately 350 x 350 pixels against a white or light background, with your face covering at least 80 percent of the frame.

What are the CDS documents required for the application form?

You need a valid photo identity proof, educational qualification certificate (degree or provisional), age proof such as a birth certificate or Class 10 marksheet, and nationality proof. NCC certificate holders should keep it ready for OTA eligibility.

Is provisional degree validity accepted for CDS 2026?

Yes, a provisional degree certificate is accepted at the application stage, but you must produce the original degree at the SSB interview stage.

What should I do if my photo gets rejected on UPSC OTR?

Log in to your OTR account, go to your profile, and use the edit option to re-upload a corrected image that meets all stated specifications before submitting your application.

Download the official CDS 2026 notification, cross-check every document against the checklist above, prepare your photo and signature files before opening the OTR portal, and submit well before the closing date to leave room for any correction.