Image Compressor — Reduce Image Size in KB Online
Compress your JPG, PNG, or WebP photo to an exact file size target—such as 20KB, 50KB, or 100KB—directly in your browser. All image processing executes client-side with zero server uploads, keeping your documents completely private.
Processed directly in your device memory via HTML5 Canvas. Your personal files and signatures are never sent over the internet.
Choose & adjust
or drop your image file here
🔒 Processed 100% locally in your browser memory
Preview & download
A fresh start for your image
Upload an image in step 1 to see the interactive crop editor and live preview here.
Choose an image to get started.
How to Compress an Image to an Exact KB Target
Follow these four simple steps to reduce your image file size to fit portal upload requirements:
Select or drag your image
Upload any JPG, PNG, or WebP photo or scanned document from your computer or phone. Files up to 50 MB are supported.
Enter your desired file size in KB
Type your target maximum size in Kilobytes (e.g., 20 for signatures, 50 for candidate photographs, or 100 for ID proofs).
Select output format and compress
Choose JPEG for maximum compression efficiency. Click "Compress image" to run the dual-phase binary search algorithm.
Download verified result
The compressor verifies actual output bytes against your target before presenting the download link. Save your optimized image instantly.
Technical Specifications & Limits
Engineered for maximum fidelity and client-side privacy
- Supported Inputs
- JPEG (.jpg, .jpeg), PNG (.png), WebP (.webp)
- Supported Outputs
- JPEG (.jpg), PNG (.png), WebP (.webp)
- Maximum File Size
- 50 MB per file
- Processing Location
- 100% Client-Side. Images never leave your device memory.
Standard Exam Portal File Size Guidelines
Official standards from UPSC, SSC, IBPS, and State Boards
Major government recruitment boards and academic testing agencies enforce strict upper and lower file size limits on uploaded photographs and signatures:
- ✓IBPS (Banking Exams): Photographs must be between 20 KB and 50 KB; signatures must be between 10 KB and 20 KB.
- ✓SSC (Staff Selection Commission): Photos must range between 20 KB and 50 KB; signatures strictly between 10 KB and 20 KB.
- ✓UPSC (Civil Services & Engineering): Photos and signatures must be between 20 KB and 300 KB in JPEG format.
- ✓State PSCs & NTA (NEET / JEE): Photographs typically require 10 KB to 200 KB with white backgrounds.
Recommended Preparation Pipelines
Combine our browser utilities to meet multi-step application requirements:
Need to resize dimensions first?
Many exam forms specify both pixel dimensions (e.g., 200×230 px) and a KB limit. Set dimensions with our Image Resizer before compressing.
Need to crop out excess borders?
Cropping tight around your face or document removes unnecessary pixels, allowing higher quality at smaller file sizes.
Preparing a signature scan?
Remove scanner grey tint and off-white paper backgrounds before reducing file size with our dedicated Signature Cleaner.
Frequently Asked Questions About Image Compressor
Answers to common queries regarding file limits, quality preservation, and exam portals:
How do I compress an image to exactly 50KB or 20KB?
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Upload your photo, type "50" or "20" into the "Target size (KB)" input, select JPEG format, and click "Compress image". Our compressor tests multiple compression levels using binary search and verifies the actual byte count of the exported blob to ensure it does not exceed your limit.
Why do government exam portals reject images that exceed 50KB?
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Government and educational portals process millions of candidate records. To prevent server storage overload and ensure rapid admit card generation, their upload scripts strictly validate file headers and byte lengths, immediately rejecting any file that exceeds the specified limit by even 1 byte.
What happens if a target size is too small for my image?
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If an image has high pixel dimensions (e.g., 4000×3000) and cannot fit within a very small target like 10KB even at minimum JPEG quality, our algorithm automatically downscales dimensions proportionally until the byte limit is safely reached, keeping text and facial features as legible as possible.
Is my photo uploaded to a server during compression?
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No. All compression occurs strictly inside your web browser using JavaScript and HTML5 Canvas. Your file is never sent over the internet to any remote server or cloud service.
Should I choose JPEG, PNG, or WebP for exam applications?
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Almost all official recruitment portals (UPSC, SSC, IBPS, Railways) require standard JPEG (.jpg / .jpeg) format. Use PNG only if transparency is needed, or WebP for modern web publishing.
Explore Companion Utilities
All six precision tools are 100% free, private, and execute right in your browser:
Image Resizer
Resize images by pixel width and height for application portals.
Image Cropper
Crop and frame photos with aspect ratios and 8-handle precision.
Image Converter
Convert between JPG, PNG, and WebP with white background fill.
Signature Resizer & Cleaner
Clean paper backgrounds and resize signatures for online forms.
Images to PDF Converter
Combine photos into a clean, multi-page PDF document.