Smart Image Converter & Exact KB Compressor – Complete Guide
In today's digital era, applying for government examinations (such as SSC CGL, CHSL, GD, UPSC Civil Services, NTA NEET, JEE Main, IBPS Banking, Railway RRB, and State PSCs) requires strict adherence to photo and signature upload guidelines. Government portals enforce rigid file size limits (such as 20 KB to 50 KB for photographs and 10 KB to 20 KB for signatures) along with mandatory pixel dimensions (e.g. 200×230 px and 140×60 px).
AIDocToolHub Studio is an official portal-grade, 100% client-side image utility designed specifically for students, cyber cafes, CSC operators, and professionals. It solves the biggest problem faced during online application submission: reducing file size without blurring faces, signatures, stamps, or fine text.
🌟 Why AIDocToolHub Studio is #1 for Govt Forms & Cyber Cafes
- 🔒 100% Private & Offline (Zero Server Upload): All image processing happens directly inside your browser's memory using HTML5 Canvas and WebAssembly. Your confidential documents, Aadhaar cards, PAN cards, and signatures never leave your device.
- 🎯 Guaranteed Exact Target KB: Set any target limit (e.g., 20 KB, 50 KB, 100 KB, 200 KB) and our 10-iteration binary search compression engine guarantees your file never exceeds the limit.
- ✨ Razor-Sharp Unsharp Masking Engine: Unlike generic online compressors that produce blurry, pixelated results at low KB, our built-in 3×3 luminance convolution filter sharpens text edges and signatures.
- 📄 Paper White Background Cleaner: Photos of signatures taken from smartphones often have grey or yellowish shadows. Our 1-click Paper White filter whitens paper to pure
#ffffff while keeping ink dark and crisp.
- 📑 True PDF & Windows Favicon ICO Generator: Converts images into standard single or multi-page PDFs with A4 / Letter formatting, or true binary
.ico files with multi-resolution bundles (16, 32, 48, 64, 256 px).
1-Click Exam & Govt Portal Dimension Presets
Save time with pre-configured official specifications for India's most popular examination and identity portals:
| Portal / Exam Name |
Asset Type |
Allowed KB Range |
Mandatory Dimensions |
Resolution / DPI |
| SSC (CGL, CHSL, MTS, GD, CPO) |
Passport Photo |
20 KB – 50 KB |
200 × 230 px (3.5 × 4.5 cm) |
200 DPI |
| SSC (Staff Selection Commission) |
Signature |
10 KB – 20 KB |
140 × 60 px (4.0 × 2.0 cm) |
200 DPI |
| UPSC (IAS, IPS, CDS, NDA) |
Photo & Signature |
20 KB – 300 KB |
350 × 350 px (Square) |
200 / 300 DPI |
| NTA (NEET-UG, JEE Main, CUET) |
Passport Photo |
10 KB – 200 KB |
413 × 531 px (Passport Standard) |
300 DPI |
| NSDL / UTI PAN Card |
Photograph |
< 30 KB |
213 × 213 px (Exact 300 DPI) |
300 DPI |
| NSDL / UTI PAN Card |
Signature |
< 10 KB |
400 × 200 px (Exact 300 DPI) |
300 DPI |
| Indian Passport & Visa |
Biometric Photo |
Auto High Quality |
413 × 531 px (3.5 × 4.5 cm) |
300 DPI |
| Web & Website Optimization |
Modern WebP |
Auto Optimized (80%) |
Fit within 1920 × 1080 px |
72 / 96 DPI |
Frequently Asked Questions (FAQ)
❓ How do I resize my photo to exactly 50 KB for SSC without losing quality?
Simply upload or drag your photo into the dropzone, click on the 📷 SSC Photo preset button, and the tool will automatically set the format to JPG, dimensions to 200×230 px, and file size to under 50 KB while applying edge sharpening. Then click Download Converted Image.
❓ Why does my signature get rejected on govt job portals?
Signatures are usually rejected due to: (1) exceeding the maximum allowed KB (e.g., 20 KB), (2) dark, shadowed or yellow scanner backgrounds from phone photos, or (3) incorrect aspect ratio. Using our Paper White Cleaner with the ✍️ SSC Sign or PAN Sign preset fixes all three issues automatically.
❓ Is it safe to upload Aadhaar cards, PAN cards, or confidential marksheets?
Yes, 100% safe. AIDocToolHub Studio operates exclusively inside your browser's local sandbox memory. No file, metadata, or image byte is ever transmitted to any external server or stored in any database.
❓ Can I convert multiple images into a single combined PDF document?
Yes! Select PDF under Target Format, upload multiple pages, choose your preferred page sizing (Fit to Image, A4 Portrait, A4 Landscape) and margin, and click Convert & Download PDF to download a single combined multi-page PDF.
❓ Can I paste screenshots or photos directly using Ctrl+V?
Yes! You can copy any image from WhatsApp, snipping tool, or web page and press Ctrl+V anywhere on the page to instantly paste and edit it. You can also copy the converted result back to your clipboard with the 📋 Copy button.