Complete Guide to UPSC Photo & Signature Size Requirements (2026)

Applying for the UPSC Civil Services Examination (IAS, IPS, IFS) requires extreme attention to detail. Unlike other government portals that only ask for a specific KB size, the UPSC OTR (One Time Registration) and application portals are notoriously strict about both file size (KB) and image dimensions (Pixels). A single mistake here can prevent your application from being submitted.

In this guide, we break down the exact official guidelines and show you how to resize your documents perfectly in one go.

1. Official UPSC Image Guidelines

The Union Public Service Commission has a unique set of rules for photographs and signatures. Here is what you need to know before you start editing:

Photograph Requirements:

• File Size: Between 20 KB and 300 KB.
• Dimensions (Pixels): Minimum of 350 x 350 pixels, and a Maximum of 1000 x 1000 pixels.
• Format: .JPG or .JPEG only.
• Special Rule (The Name & Date Rule): The candidate’s name and the date on which the photograph was taken must be clearly printed at the bottom of the photograph. The photo should not be older than 10 days from the start of the application process.
• Background: Plain white or light-colored background. Face should cover 3/4th of the photo.

Signature Requirements:

• File Size: Between 20 KB and 300 KB.
• Dimensions (Pixels): Minimum of 350 x 350 pixels, and a Maximum of 1000 x 1000 pixels.
• Format: .JPG or .JPEG only.
• Clarity: Must be signed on plain white paper with a black ink pen.

2. How to Resize Both Pixels and KB Simultaneously

Most tools on the internet can either change the KB size or the pixel dimensions, but rarely both at the same time. If you use two different tools, changing the pixels might ruin the KB size, and vice versa. Here is the smartest way to do it using ReduceSize.online:

1. Go to the ReduceSize Tool.
2. Upload your photograph or signature.
3. In the Target Size (KB) box, enter 250 (This keeps it safely below the 300 KB maximum while preserving high quality).
4. In the Dimensions (px) section, unlock the Aspect Ratio lock (🔓).
5. Enter 350 in the Width box and 350 in the Height box. (You can also use 500x500 or any square ratio under 1000x1000).
6. Click Process & Download. The tool will output an image that perfectly satisfies both the dimension and size rules!

3. Common Reasons for UPSC Photo Rejection

Every year, thousands of candidates face panic at the last minute because their photos are rejected. Avoid these mistakes:

• Missing the Date/Name: As per recent UPSC notifications, if your photo lacks your printed name and the date the photo was taken, it will be rejected. Use a basic photo editor on your phone to add text to the bottom before compressing.
• Using Blue Ink for Signature: UPSC specifically requests signatures in black ink on white paper. Blue ink scans poorly and is often flagged by their system.
• Incorrect Proportions: While the minimum pixels are 350x350, do not artificially stretch a rectangular photo into a square. Crop the photo into a square shape first, and then resize it.

4. Frequently Asked Questions (FAQs)

Can I use the same photo for Prelims and Mains?

Yes, UPSC mandates that the appearance of the candidate (beard, spectacles, etc.) must match the uploaded photograph across all stages of the examination (Prelims, Mains, and Interview).

What if my photo is under 20KB?

The UPSC portal will throw an error and refuse to upload it. If your photo is too small, you cannot simply increase the KB artificially. You should scan or click a new, higher-quality image and then compress it down to the 20KB - 300KB range.

Conclusion: Meeting UPSC photo and signature guidelines doesn't have to be a frustrating trial-and-error process. By understanding that you need to control both the file size (KB) and the resolution (Pixels), you can use a unified tool to get your files ready in under a minute.