Compress Image to Exact KB (10KB, 20KB, 50KB, 100KB) & Signature Resizer
Compress Image to Exact KB (10KB, 20KB, 50KB) & Signature Resizer
Drop Photos or Signatures to Compress & Resize
Batch upload multiple files | Or press Ctrl+V to paste from clipboard
Select Photo or Signature
Upload any camera photo, scanned signature, thumb impression, or document directly inside your browser.
Enter Target KB & Dimensions
Type your exact KB limit (e.g., 18 KB, 48 KB, 100 KB) and set custom px, cm, mm, or official portal presets.
Boost/Compress & Download
Our engine locks the exact file size and binary DPI header so you can download immediately below Apply.
Optimizing Exact KB & DPI Resolution...
Calibrating target byte size, dimensions, and JFIF DPI metadata locally
Smart KB Lock: Enter 18 for 10-20KB signature limits or 48 for 20-50KB photo limits to hit the exact byte range without losing clarity.
Exact KB Compression Guide, Signature Specs & DPI Chart (10KB to 200KB)
Complete cheat-sheet for hitting exact kilobyte (KB) ranges, DPI headers, and signature/document dimensions across online portals.
| Target KB Tier / Document Type | Standard Pixel / CM Dimensions | Required DPI Header | Recommended Filter / Mode | Common Portal Usage |
|---|---|---|---|---|
| 10 KB - 20 KB (Digital Signature) | 140 x 60 px | 4.0 x 2.0 cm | 6.0 x 2.0 cm | 200 DPI or 300 DPI | Crisp Ink Scan + Hit Exact 18 KB | IBPS, SBI PO/Clerk, SSC CGL/CHSL, State PSCs |
| 20 KB - 50 KB (Passport Photo) | 200 x 230 px | 3.5 x 4.5 cm (413 x 531 px) | 200 DPI or 300 DPI | Original Color + Hit Exact 45 KB | SSC, Banking, RRB Railway, UPPSC, BPSC, MPSC, HPPSC |
| 20 KB - 40 KB (Left Thumb Impression) | 240 x 240 px (3.0 x 3.0 cm Square) | 200 DPI | Original / Grayscale + Hit Exact 35 KB | IBPS, SBI, RBI, NABARD & Insurance Portals |
| Under 30 KB / 50 KB (PAN Card Photo & Sign) | NSDL: 2.5x3.5 cm | UTI Photo: 213x213 px | UTI Sign: 400x200 px | NSDL: 200 DPI | UTI: 300 & 600 DPI | Exact KB Mode (28 KB / 45 KB) | Protean (NSDL) & UTIITSL PAN Applications |
| 50 KB - 100 KB (Handwritten Declaration) | 800 x 400 px (10 cm x 5 cm) | 200 DPI | Crisp Ink Scan + Hit Exact 85 KB | IBPS PO/Clerk, SBI, RBI & Banking Exams |
| 50 KB - 240 KB (High-Res Exam, Postcard & Visa) | UPSC: 350x350 px | Postcard: 4x6 in | US Visa: 600x600 px | 300 DPI | Original Color + Name/Date Strip (Optional) | UPSC CSE, NEET UG/JEE Main, US DS-160 & Schengen Visa |
Frequently Asked Questions
How to compress an image to exact 20KB, 50KB, or 100KB online without losing quality?
Upload your photo or document, go to Section 2 ("Exact KB Compression & Booster"), and type your desired kilobyte number (such as 18, 48, or 98) in the "Target File Size (KB)" box. Keep the mode set to "Hit Exact KB (Boost/Compress)" and click Apply. Our binary search encoder finds the highest visual quality that fits right inside your target KB limit.
How to resize and compress a signature to 10KB-20KB (140x60 px or 4x2 cm) with clear dark ink?
Select either the "IBPS / SBI Signature (140x60 px | 18 KB)" or "SSC Signature (4.0x2.0 cm | 18 KB)" preset from Section 1. Next, in Section 3, change the "Document / Color Filter" dropdown to "Crisp Ink Scan (High Contrast)". This whitens dull paper shadows and makes pen ink sharp and legible while locking the file size at ~17.5 KB.
Why does my cropped photo or signature become too small (e.g., 3KB or 5KB), and how can I increase its KB size?
Small pixel dimensions like 140x60 px or 200x230 px naturally contain very few pixels, so standard compressors save them as 3 KB to 6 KB files—which online portals reject for being below the 10 KB or 20 KB minimum. When you use our "Hit Exact KB" mode and enter 18 or 35 KB, our booster injects safe, standard-compliant JPEG metadata padding to increase the file size to your exact target without stretching the pixels.
How to change image resolution to 200 DPI, 300 DPI, or 600 DPI in JPG format?
In Section 1, choose 200 DPI, 300 DPI, or 600 DPI from the "Print DPI Header" dropdown. Unlike basic HTML5 canvas tools that always export at 96 DPI, our client-side binary writer directly updates the JPEG JFIF density bytes so automated portal scanners (such as NSDL, UTIITSL, IBPS, and Passport Seva) detect the exact required DPI.
Can I compress multiple images in bulk and also set custom width and height in cm, mm, inches, or pixels?
Yes! You can drag and drop multiple images into the queue at once, select your preferred unit (Pixels, Centimeters, Millimeters, Inches, or Percentage), enter any custom Width and Height along with a target KB size, and click Apply. All images in your queue will be processed locally and can be downloaded individually or packed into a single ZIP file.