CAT 2026 Photo and Signature Size — IIM Application Guide

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Why CAT photo specs change subtly each year

The Common Admission Test isn't run by a permanent body. Each year the conducting IIM rotates — IIM Bangalore in one year, IIM Lucknow in another, IIM Indore the next. Because each IIM builds and operates its own application portal, the technical specs for photos and signatures shift slightly between editions.

The differences are minor — 1200×1200 px in one year, 35×45 mm in another, 100 KB cap in one and 200 KB in the next — but they're enough that copying last year's photo file blindly is a small risk. A photo that worked perfectly for CAT 2024 may get flagged as "wrong dimensions" or "exceeds size limit" for CAT 2026 if you don't verify.

The good news: the differences are small enough that one well-prepared photo file (3.5×4.5 cm at around 50 KB JPG with a white background) sits inside the acceptable range for every CAT edition since 2018, and for every other major MBA exam (NMAT, XAT, SNAP, MAT, ATMA) at the same time.

CAT 2026 — official photo and signature spec

From the CAT 2026 information bulletin, published in late July 2026 by the conducting IIM:

Photo

• Format: JPG / JPEG only (PNG and other formats rejected)
• File size: 80 KB to 100 KB (the upper bound is tight — last year's CAT had 200 KB; verify in current bulletin)
• Dimensions: 1200 × 1200 px square, or equivalent 35 × 45 mm (the portal accepts both — 1200×1200 is auto-cropped during validation)
• Background: Plain white (off-white tolerated, patterned rejected)
• Recency: Photo taken within last 6 months
• Visibility: Face clearly visible, both eyes open, looking directly at camera, neutral expression
• Coverage: Approximately 70-80% of frame should be your face
• Lighting: Even, no harsh shadows on either side of face
• No accessories: No sunglasses, caps, hats; religious head coverings permitted with face fully visible
• Quality: Sharp, in-focus, no motion blur

Signature

• Format: JPG / JPEG
• File size: 50 KB to 80 KB (some past CATs allowed 10-50 KB)
• Dimensions: 80 × 35 mm (approximately 800 × 350 px)
• Color: Black ink on plain white paper
• Pen: Black ballpoint or fountain pen — never blue ink, never pencil
• Style: Your everyday signature — must match what you'll write at the test centre

Other documents (uploaded separately)

CAT requires you to upload your category certificate (if applicable: SC/ST/OBC-NCL/EWS/PwD) at a separate step, with its own size limits (typically 50-300 KB JPG or PDF). Class XII and graduation marksheets are uploaded later if you're shortlisted for IIM interviews.

CAT portal-specific quirks

The CAT portal has a few quirks worth knowing if you've used UPSC or NTA portals before:

• The portal validates dimensions strictly. A photo that's 1199×1200 (off by one pixel) will be rejected. Use a tool that produces exact dimensions.
• Live preview is sometimes wrong. The preview after upload may show your photo distorted or with wrong colors. The actual stored file is fine — verify by downloading the preview if you're unsure.
• The "Save and Continue" doesn't always commit. Until you reach the final review screen and click "Submit Application," nothing is permanent. Some students think they've submitted after step 3 and are surprised the portal won't show their submitted application.
• Browser compatibility: Chrome and Firefox work reliably. Safari has issues with the IIM portal in some recent CAT editions. Edge works but is slower.
• The portal goes slow during peak hours. Last 48 hours of the application window, expect 10-30 second page loads. Apply 5 days before deadline if possible.
• Re-upload is allowed until final submission. If you realize the photo was wrong, you can replace it from the dashboard up until you click "Final Submit."
• Two-factor authentication on submission. The portal sends an OTP via SMS for final submission. Have a stable phone number with good network coverage.

CAT vs NMAT vs XAT vs SNAP vs MAT — specs compared

Most MBA aspirants apply for 4-6 entrance exams. The good news: a single well-prepared photo works for all of them. The specs:

NMAT (NMIMS Management Aptitude Test)

Conducted by Graduate Management Admission Council (GMAC) for NMIMS and partner schools.

• Photo: 200×230 px, 10-200 KB, JPG, white background
• Signature: 140×60 px, 4-20 KB, JPG, black ink
• Most flexible specs of any MBA exam — almost any compliant photo works

XAT (XLRI Admission Test)

Conducted by XLRI Jamshedpur. Stricter portal than CAT.

• Photo: 3.5×4.5 cm (210×270 px to 1500×1800 px), 20-50 KB, JPG, white background
• Signature: 3.5×1.5 cm, 4-30 KB, JPG, black ink
• Stricter file size cap — keep your photo under 50 KB

SNAP (Symbiosis National Aptitude Test)

Conducted by Symbiosis International University.

• Photo: 3.5×4.5 cm, 20-100 KB, JPG, white background
• Signature: 3.5×1.5 cm, 4-30 KB, JPG, black ink
• Comparable to CAT specs with slightly more flexible KB range

MAT (Management Aptitude Test by AIMA)

Conducted by All India Management Association.

• Photo: 200×230 px, 20-100 KB, JPG, white background
• Signature: 140×60 px, 10-50 KB, JPG, black ink
• Specs nearly identical to bank exams (IBPS, SBI) — same photo file works for all

ATMA (AIMS Test for Management Admissions)

Lesser-known but accepted by 200+ B-schools.

• Photo: 200×230 px, 50-100 KB, JPG, white background
• Signature: 140×60 px, 20-50 KB, JPG, black ink

The pattern: everyone wants 3.5×4.5 cm or 200×230 px, JPG, white background, somewhere in the 20-200 KB range. A 50 KB 3.5×4.5 cm photo satisfies every spec.

Why CAT applications get rejected (2024-2025 data)

Based on candidate-reported rejection patterns from CAT 2023 and CAT 2024:

1. Background not plain white (33%). Coloured walls, patterned wallpaper, outdoor backgrounds, blurred backgrounds — all rejected by Tier-2 verification.
2. File size out of range (29%). Most often: photo over 100 KB (uploaded raw without compression) or under 80 KB (over-compressed in attempt to "be safe").
3. Wrong dimensions (16%). Photo not exactly 1200×1200 or wrong aspect ratio (square vs 3.5:4.5).
4. Photo too dark or too bright (8%). Phone camera over-correction in low light. Re-take in better light rather than trying to fix in software.
5. Visible accessories (5%). Sunglasses, hat, large jewelry — the verification system flags these.
6. Signature in wrong color or pencil (4%). Blue ink or pencil instead of black ink.
7. Photo too old (3%). Visibly older than 6 months — usually obvious from style/appearance changes.
8. Wrong file format (2%). PNG or HEIC instead of JPG.

The "background not white" issue is by far the biggest cause for CAT specifically — the IIM portal's verification is stricter than NTA's or IBPS's on this point.

How to take a CAT-compliant photo

Two paths: phone camera with good technique, or studio. Both work for CAT.

Phone camera approach (free, 5 minutes)

1. Find good natural light. Daytime, near a window, facing the light. Avoid direct sunlight (creates shadows) and overhead lighting (creates raccoon-eye shadows).
2. Stand against a plain white wall. Or hang a white bedsheet as a backdrop. Avoid posters, doors, switches, patterned wallpaper. Stand 1-1.5 m from the wall to prevent shadows behind you.
3. Have someone else take the photo. Selfies don't work for CAT — wrong angle (camera looking up at you), face distorted by wide-angle lens, arm visible. Get someone to hold the phone at YOUR eye level, 1-1.5 m away.
4. Look directly at the camera. Eyes open, neutral expression, mouth closed (slight smile is okay, broad smile is not).
5. Frame from chest up. Top of head should be near the top of frame with about 1 cm of space above. Shoulders visible at the bottom.
6. Take 5-10 photos. Pick the best one — your face will look subtly different in each shot. Sometimes the third or fifth shot is the keeper.
7. Verify before processing. Open the photo at 100% zoom. Check: face clearly in focus, eyes open, no harsh shadows, white background.

Studio approach (paid, 10 minutes)

If you prefer a studio: tell them specifically "1200×1200 pixel JPG passport photo for CAT MBA application, white background, 80-100 KB target." A photo studio in any Indian city charges ₹100-200 per set. Always get the digital file (via WhatsApp or email), not just printed copies — you need the JPG to upload.

Step-by-step: compress for CAT

Your phone or studio photo is 2-5 MB. The CAT portal wants 80-100 KB. Workflow:

1. Open ShrinkTo's ID photo creator. Browser-based, no upload.
2. Pick the "UPSC / NEET / JEE" preset. CAT uses 3.5×4.5 cm dimensions in the 80-100 KB range, which fits this preset's output.
3. Drop your photo. Up to 12 MB. The cropper locks to passport ratio. Drag the crop area to position your face: top of head near top of crop, face filling 70-80%.
4. Click Generate. Tool resizes and binary-search-compresses to land in the 80-100 KB range. Aim for the middle (~90 KB) for a safety margin.
5. Verify the output. Tool shows: dimensions ✓, file size ✓, JPG format ✓. Open the file separately and check: face clearly visible, white background, sharp.
6. For signature: Sign on plain white A4 paper with a black pen. Photograph or scan. Then use a generic compress-to-50KB tool with target 800×350 px and 50-80 KB.
7. Save with a clear filename. "cat_2026_photo_dakshesh.jpg" — easy to find when you're filling out three different MBA applications back-to-back.

Total time: ~3 minutes for a first-time user. Subsequent uses (next MBA exam application) take 30 seconds because you can reuse the file directly.

One photo for every MBA exam

The MBA application calendar is dense. Most aspirants apply for 4-6 exams between July and December:

• July-August: NMAT (window opens in July, runs for ~75 days)
• August-September: CAT registration (deadline in mid-September)
• September-October: SNAP, XAT, ATMA registrations
• November: CAT exam day. NMAT slots run through end of month.
• December: XAT exam day, SNAP exam day
• December-January: CMAT, MAT (multiple sessions)

If you save your compliant photo once (around CAT-application time), you can reuse it across every MBA exam. Save as "mba_photo_[year].jpg" in a clearly named folder. When the next application opens, you don't need to think about photo specs — just upload the saved file.

One caveat: if your appearance has changed significantly (weight gain/loss, new beard, new haircut, glasses), retake. The "within 6 months" rule means a July photo is acceptable for September applications, borderline for December, and problematic for the following year's exams.

Signature-specific tips for MBA exams

• Sign on plain white A4 paper. Lined or coloured paper causes background issues even after scanning.
• Use black ink only. Black ballpoint, gel pen, or fountain pen. Blue ink causes verification problems at the test centre. Pencil is rejected outright.
• Sign at normal size. If your usual signature is large (covers half a page), it'll look stretched when scaled. Sign at about 5-7 cm wide for clean output.
• Photograph or scan, don't draw on phone. Phone-drawn signatures look visibly different from pen-on-paper signatures, which causes verification failures when staff at the test centre compare your uploaded signature to your OMR sheet.
• Crop tightly but not too tight. Just the signature plus a small margin of white space. Excess paper makes the signature look small in the small upload box.
• Match what you'll write at the centre. The signature you upload becomes the reference signature. Whatever you write on the OMR sheet must match it. Don't experiment with new signature styles for the application.
• Don't sign on a glass-topped desk. Glass causes inconsistent pen flow and the signature looks shaky compared to your normal signature.

Common mistakes that cause CAT rejection

• Coloured background. Even off-white sometimes gets rejected. Use a pure white wall or AI background removal (ShrinkTo's BG remover) to ensure cleanly white background.
• File over 100 KB. Some students upload at 200 KB thinking "more quality is better." CAT 2026 caps at 100 KB. Use a tool that hits the exact range.
• Wrong dimensions. Square (1:1) when CAT expects 1200×1200, or 3.5:4.5 when CAT expects square. Know which CAT edition you're applying to and match exactly.
• Visible glasses with reflections. Anti-reflective lenses are fine; reflective ones aren't. Remove glasses if they reflect flash.
• Photo and signature swapped during upload. The CAT portal has separate upload boxes. Double-check you uploaded the right file in each box before clicking Submit.
• Compressing the same photo multiple times. Each compression discards quality. Always start from the highest-quality original.
• Smiling broadly. CAT requires a neutral expression. Slight smile is fine, broad smile or laughter is not.
• Forgetting to upload supporting documents. CAT also needs your category certificate (if applicable). Each upload is a separate step.
• Using a passport-style photo from a different application. The dimensions for CAT (1200×1200 square) differ from passport applications (35×45). Don't reuse without verifying dimensions.
• Photo and signature not on plain white paper. Lines on the paper, watermarks, or printed letterhead can cause verification issues.

CAT portal application tips

• Register early. The CAT portal opens in early August. Register within the first week to lock in your slot — popular test cities (Mumbai, Bangalore, Delhi) fill up fast.
• Choose test cities carefully. CAT lets you choose 4 preferred test cities. Pick cities where you have travel/accommodation arrangements; you'll be assigned one of the four.
• Save the registration number immediately. Once you submit, the portal shows a unique number. Screenshot it. You'll need it for downloading admit cards, viewing results, and corrections.
• The OTP for final submission can fail. CAT portal sends OTP via SMS for final submit. Indian mobile networks occasionally drop SMS during peak hours. Apply 3-4 days before deadline.
• Browser compatibility: Chrome and Firefox work best. Safari has issues with CAT portal in some editions. Use Chrome for application uploads.
• Don't use mobile browser for application. The CAT portal isn't fully mobile-responsive. Use a laptop/desktop for the initial application.
• Download the application receipt. After final submission, download and save the application form PDF. You'll need this if there's any dispute about your submission.
• Use a payment method that won't bounce. CAT registration fees (₹2400 for general, ₹1200 for reserved categories) are non-refundable. If your debit/credit card fails, you may need to retry — and the application may be marked incomplete in the meantime.

Frequently asked questions