Resize Image (All Functions & Units)
Convert image dimensions with exact physical units (pixels, cm, mm, inches) and DPI adjustments. Compress file sizes to exact target limits (e.g., 20KB, 50KB, 100KB) and batch-download multiple images as a ZIP file.
Drop images here, or browse
Upload single or multiple images (JPG, PNG, WebP) to resize, convert DPI, or compress to target KB limits.
1. Dimension & Units
Exact Conversion2. Target File Size (KB Limit)
Automatically calculates compression quality to match your exact file size limit for exam and government uploads.
3. Enhancements & Rotation
Live Canvas Output Preview
Original Dim
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Original Size
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Target Output Dim
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Estimated Output Size
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Images in Queue
1+ Drop additional photos to apply these dimensions to all
How Physical Units (cm, mm, in) and DPI Work in Image Resizing
Digital images are measured in pixels (px). When you need to print a photo or submit an image for official government exams that specify measurements in centimeters (cm), millimeters (mm), or inches (in), the image size in pixels is directly calculated using the DPI (Dots Per Inch) resolution.
DPI Conversion Formula
• Pixels = Inches × DPI
• Pixels = (Centimeters / 2.54) × DPI
• Pixels = (Millimeters / 25.4) × DPI
Standard Exam Resolutions
• Passport Size (3.5 × 4.5 cm @ 300 DPI) = 413 × 531 px
• SSC Photo (3.5 × 4.5 cm @ 200 DPI) = 276 × 354 px
• Postcard (4 × 6 inches @ 300 DPI) = 1200 × 1800 px
Frequently Asked Questions (FAQ)
How does the exact KB compressor work?
Our client-side algorithm uses iterative binary search to calculate the optimal JPEG/WebP compression level to meet your exact KB limit without reducing the pixel dimensions of your photo.
Are my photos uploaded to any external server?
No. 100% of processing (resizing, aspect-ratio cropping, color adjustments, and ZIP packaging) runs inside your browser using HTML5 Canvas and Web APIs. Your images never leave your device.