Thumb Impression Resizer
(20KB - 50KB) & Ridge Clarifier
Crop, enhance fingerprint ridges, remove background shadows, and compress Left Thumb Impressions (LTI) & Right Thumb Impressions (RTI) to exact official dimensions for IBPS, SBI, NEET, UPSC, RRB Railways, and SSC.
How to Resize & Prepare Left Thumb Impression (LTI) for Government Exams
Follow this simple 5-step process to generate a 100% portal-compliant thumb impression image with exact dimensions (240x240 px, 200 DPI) and strict file size limits (20KB–50KB).
Select Exam Preset
Click IBPS, SBI, NEET, UPSC, RRB, or choose Custom Manual mode to enter custom pixels, cm, or mm.
Upload Thumb Scan
Upload your thumb impression scan or phone photo (JPG, PNG) or paste instantly with Ctrl+V.
Clarify Ridges & Paper
Apply "Crisp B&W" or "Deep Blue Pad" filter to eliminate scanner shadows and sharpen friction ridge loops.
Set Target KB Limit
Choose official 20 KB – 50 KB (IBPS/SBI standard) or adjust slider for custom byte limits.
Download & Submit
Inspect live preview, verify dimension and KB compliance, and click "Download Thumb Impression (JPG)".
Official Government Exam Thumb Impression Requirements (2026)
Reference table of official dimensions, file size limits, and ink specifications for major competitive recruitment portals in India:
| Recruitment Portal / Exam | Impression Type | Mandatory Dimensions | File Size (KB) | DPI & Ink Rules |
|---|---|---|---|---|
| IBPS PO / Clerk / SO / RRB | Left Thumb (LTI) | 240 × 240 px (3 × 3 cm) | 20 KB – 50 KB | 200 DPI · Blue or Black Ink Pad |
| SBI PO / Clerk / Specialist | Left Thumb (LTI) | 240 × 240 px (3 × 3 cm) | 20 KB – 50 KB | 200 DPI · Plain White Paper |
| NTA NEET UG Entrance | Both (LTI & RTI) | 400 × 300 px (Box Scan) | 10 KB – 200 KB | 200 DPI · Blue Ink on White Paper |
| UPSC OTR & Civil Services | Left Thumb (LTI) | 350 × 350 px (3.5 × 3.5 cm) | 20 KB – 300 KB | 300 DPI · Crisp Clear Ridges |
| RRB Railway (NTPC, ALP, Group D) | Left Thumb (LTI) | 140 × 140 px (3.5 × 3.5 cm) | 15 KB – 40 KB | 100 DPI · Blue/Black Ink |
| Indian Army Agniveer Rally | Left Thumb (LTI) | 200 × 200 px (3.5 × 3.5 cm) | 10 KB – 50 KB | 200 DPI · Blue Stamp Pad |
| PAN Card (NSDL / UTIITSL) | Left Thumb (LTI) | 200 × 200 px (2.5 × 2.5 cm) | 10 KB – 20 KB | 200 DPI · Pure White Background |
⚠️ Thumb Impression Rejection Prevention Checklist (Avoid Disqualification)
Always use your Left Hand Thumb unless the official portal explicitly permits Right Thumb (RTI).
Use a standard blue or black stamp pad. Avoid over-inking which causes smudging and loss of friction ridges.
Press on unruled plain white A4 paper. Use our Paper Cleaner to eliminate room shadows and gray tints.
Maintain exact 200 DPI resolution and 20 KB to 50 KB file boundaries mandated by IBPS, SBI, and NTA.
Frequently Asked Questions (Thumb Impression & LTI Resizing)
Everything you need to know about official thumb impression dimensions, file size limits (20KB–50KB), 200 DPI resolution, and biometric verification.
1What is the official thumb impression size and KB limit for Banking exams (IBPS PO / Clerk / SBI)?▼
For IBPS and SBI banking examinations, the candidate must upload their Left Thumb Impression (LTI) in JPG/JPEG format strictly between 20 KB and 50 KB. The mandatory dimensions are 240 x 240 pixels (or 3 cm x 3 cm) scanned at 200 DPI on plain white paper with blue or black stamp pad ink.
2Which hand thumb impression should be uploaded (LTI vs RTI)?▼
Unless specifically stated otherwise in the official notification, all major Indian recruitment bodies (IBPS, SBI, UPSC, RRB, SSC, State PSCs) mandate the Left Hand Thumb Impression (LTI). If a candidate does not have a left thumb, they may use their Right Thumb Impression (RTI) with an accompanying medical or self-declaration as allowed by the exam board.
3What are the thumb impression requirements for NTA NEET UG?▼
For NEET UG applications, NTA requires candidates to provide left and right-hand thumb and finger impressions within a designated box on white paper with blue ink. The file format must be JPG/JPEG and the file size must be between 10 KB and 200 KB with clearly visible ridge patterns.
4Why do exam portals reject blurred or faint thumb impressions?▼
Automated biometric verification systems and invigilation software scan for distinct friction ridges (dactyloscopy loops and whorls). If the stamp pad was too wet (smudged ink) or too dry (faint broken lines), the portal algorithms cannot detect unique ridge patterns, causing application rejection. Our tool includes an AI Anti-Blur Biometric Ridge Clarifier to sharpen faint lines.
5How does the Biometric Ridge Clarifier and Paper Whitening filter work?▼
Phone cameras often introduce room lighting tints, paper texture, and scanner shadows. Our tool cleans greyish and off-white backdrops to pure 100% white (#FFFFFF) while intensifying blue and black ink ridges to maximize contrast, ensuring 100% compliance with government biometric filters.
6How can I set 200 DPI resolution as required by IBPS guidelines?▼
Our widget features a dedicated DPI Resolution Selector (200 DPI standard). When selected, the resizer automatically calculates pixel density and injects compliant physical-to-digital aspect ratios suitable for banking and entrance portals.
7Is my biometric fingerprint/thumb scan safe and private?▼
Yes, 100% guaranteed. Fingerprint ridges are sensitive biometric data. All image cropping, contrast adjustments, background whitening, and compression happen entirely inside your web browser using client-side HTML5 Canvas. No thumb impression is ever uploaded or stored on any server.
8Can I resize thumb impressions in Centimeters (cm) or Millimeters (mm)?▼
Yes! Simply switch the Dimension unit from Pixels (px) to Centimeters (cm) or Millimeters (mm). The tool will dynamically compute the exact pixel resolution based on your selected DPI.