Exam form photo and signature size in India, and how to hit it exactly

The short answer. Most Indian exam portals want a JPG photograph of 20 to 50 KB at about 200 × 230 pixels and a signature of 10 to 20 KB at about 140 × 60 pixels. A phone photo is about 4 MB, two hundred times too big: resize to the pixels first, then compress to the kilobytes.

What portals actually ask for

The exact numbers differ by exam, and the form page is always the authority. But the pattern is remarkably consistent, and knowing it saves the guesswork:

What	Usual size in KB	Usual dimensions
Photograph	20 KB to 50 KB	200 × 230 px, or 3.5 × 4.5 cm
Signature	10 KB to 20 KB	140 × 60 px
Thumb impression	20 KB to 50 KB	240 × 240 px
Passport photo (offline)	not specified	35 × 45 mm at 300 DPI, which is 413 × 531 px

Two things follow from that table. First, a signature has to be smaller than the photo, which surprises people who compress both the same way. Second, the pixel size and the KB size are separate requirements, and meeting one does not meet the other.

Why your file is 4 MB when they want 20 KB

A modern phone camera produces roughly 12 megapixels. A photograph that big is about 4 MB, and the form wants 20 KB, two hundred times smaller. That gap is not a mistake on the portal's part. The photo is going to be printed on an admit card at the size of a stamp, so it never needed the detail.

Getting there is two separate steps, done in this order:

1. Resize first. Bring the pixel dimensions down to what the form asks for with Resize Image, which takes an exact width and height in pixels or centimetres; its passport size photo preset is the 35 × 45 mm case. A 4000 × 3000 photo cut to 200 × 230 loses most of its weight immediately, before any quality is sacrificed.
2. Compress second. Now trim the remaining kilobytes by re-encoding with Compress Image. Type the limit the form gives, 20 KB or 50 KB, and it finds the highest quality that fits; the 20 KB and 50 KB pages open with that target set. Because the image is already small in dimensions, the quality setting can stay high.

Doing it the other way round, compressing a huge photo hard and then resizing, throws away detail twice and produces a visibly worse result at the same file size.

Getting the signature right

Signatures fail more often than photographs, for a reason that has nothing to do with size. A signature photographed on lined paper, or on a grey background, or with a shadow across it, is rejected because the portal cannot separate the ink from the page.

What works: white unlined paper, a black or dark blue pen, good even light with no shadow falling across the sheet, and the camera held square above it rather than at an angle. Crop tightly to the signature itself before you resize, otherwise most of your 20 KB is spent on empty paper.

The 20 KB problem

Under about 20 KB, a colour photograph starts to show blocky patches around the face, which is exactly where a verifier looks. Three things help:

• Crop tighter. Head and shoulders only. Fewer pixels spent on background means more spent on the face.
• Plain background. A flat white or light blue wall compresses far better than a bookshelf.
• Resize before compressing. As above; it is the single biggest lever.

If it still will not fit, check whether the form accepts JPG only or also PNG. A photograph should always be JPG. PNG is for graphics with flat colour, and a PNG photograph at 20 KB looks considerably worse.

Keep the original

Compress a copy, never your only version. You will need a larger one later for a different form with different limits, and a file that has been compressed to 20 KB can never be restored. Keep the camera original somewhere safe and treat every upload as a throwaway copy made from it.

Your documents do not leave your device

A photograph for an exam form, a signature, a thumb impression: these are identity documents. Every tool here runs inside your browser, so none of them is uploaded anywhere, and the tools keep working if your connection drops. There is no account, no limit on how many you do, and no watermark.

If the form is for UGC NET, Omnikit also has free timed UGC NET Paper 1 practice papers, with no login.

Questions people ask

What is the photo size for an exam form in India?

Most portals ask for a JPG between 20 KB and 50 KB, around 200 × 230 pixels or 3.5 × 4.5 cm, with a plain light background and the face taking most of the frame. The form page is the authority: read its instructions for the exact kilobyte range and pixel size before you resize anything.

How do I reduce a photo to 20 KB without losing quality?

Resize before you compress. Cut the photo to the pixel size the form wants, about 200 × 230, which removes most of a 4 MB file on its own. Then compress the small picture to 20 KB as a JPG: because so few pixels remain, the quality setting stays high and the face stays sharp.

What size should the signature be for an exam form?

Usually 10 KB to 20 KB, at about 140 × 60 pixels, smaller than the photograph. Sign in black or dark blue ink on plain white paper, photograph it square-on in even light, crop to the ink before resizing, and save as JPG. Most rejections come from lined paper, shadows or a grey background, not from the size.

Should the exam photo be JPG or PNG?

JPG, unless the portal says otherwise. JPG is made for photographs and reaches 20 KB with the face still clear; PNG suits flat graphics, and a PNG photograph squeezed to the same size looks far worse. If the form accepts both, choose JPG and keep the uncompressed original for the next form.

What is 3.5 × 4.5 cm in pixels?

At 300 dpi, 3.5 × 4.5 cm is 413 × 531 pixels: one inch is 2.54 cm, so 3.5 ÷ 2.54 × 300 is 413. At 200 dpi it is 276 × 354 pixels. When a portal gives both a centimetre size and a pixel size, use the pixel size; the centimetres only describe how it prints.

Sources

Checked 22 Oct 2026:

• The instructions page of the exam you are applying to, usually headed "Scanned images" or "Photograph and signature": it is the authority, and the ranges above are the common pattern across central-exam portals, not a rule.
• The pixel arithmetic: one inch is 25.4 mm, so 35 × 45 mm at 300 dpi is 35 ÷ 25.4 × 300 = 413 by 45 ÷ 25.4 × 300 = 531 pixels.
• The file sizes in this guide are what the tools linked above produce from a 12-megapixel phone photograph; your own photo will differ a little with its background and lighting.