Exact Size Compression - Hit Any KB Target Precisely

Need an image at exactly 75KB? 150KB? 2.5MB? Our precision compression engine targets any custom file size you specify with ±3% accuracy. Perfect for developers with API limits, designers with CMS restrictions, or anyone with unusual size requirements that standard presets don't cover.

Upload → Auto-compress → Download (recommended)

or drag and drop

Images only • Max 100MB per file

When You Need Exact Custom Sizes

  • Web developers optimizing for specific CDN or API limits
  • CMS platforms with non-standard upload restrictions
  • Custom corporate portals with unique file size requirements
  • A/B testing different file sizes for page load optimization
  • Balancing quality vs. size for specific bandwidth constraints
  • Meeting obscure government or industry-specific regulations
  • Precise control for programmatic image processing workflows

Common Use Cases

Web Development & APIs

APIs like WhatsApp Business (16MB), Twitter (5MB images), or custom backends often have non-standard limits. Hit exact targets for optimal integration.

  • WhatsApp API limits
  • Twitter image uploads
  • REST API constraints
  • GraphQL file limits
  • Custom backend requirements

CMS & Website Builders

WordPress, Wix, Squarespace, and custom CMS platforms have varying upload limits. Compress to exact sizes their systems accept.

  • WordPress image optimization
  • Shopify product photos
  • Wix website images
  • Squarespace galleries
  • Custom CMS uploads

Performance Optimization

Front-end developers targeting specific Core Web Vitals scores need precise file sizes for measurable page speed improvements.

  • Lighthouse optimization
  • Core Web Vitals tuning
  • Page speed targeting
  • Bandwidth budgeting
  • Performance testing

Marketing Campaigns

Email marketing platforms like Mailchimp have size limits per email. Compress hero images and banners to exact specs for template consistency.

  • Email newsletter images
  • Marketing automation
  • Campaign templates
  • Social media specs
  • Ad platform requirements

Specialized Applications

Scientific publishing, legal document submission, medical imaging, and other specialized fields often require exact file sizes for compliance.

  • Scientific journals
  • Legal e-filing
  • Medical records
  • Insurance claims
  • Regulatory submissions

How to Use

  1. 1Upload your image (any format supported: JPG, PNG, WebP, HEIC)
  2. 2Enter your exact target size - we accept KB or MB values
  3. 3Our binary search algorithm iterates to hit your target precisely
  4. 4Monitor quality score and compression iterations in real-time
  5. 5Download when satisfied - guaranteed within ±3% of target

Frequently Asked Questions

How accurate is the exact size targeting?

Our algorithm achieves ±3% accuracy, typically within ±5KB for most images. For a 100KB target, expect 97-103KB. The binary search method iterates up to 10 times for optimal precision while maintaining maximum quality.

What if I need an extremely small size that degrades quality significantly?

The tool will compress to your target but displays a quality warning if degradation is severe. You'll see the quality score drop and can adjust your target upward if needed. We prioritize hitting your target, but inform you of quality trade-offs.

Can I compress to sizes larger than my original image?

No - you can't make images larger through compression. If your target exceeds the original file size, we'll return the original unchanged. The tool prevents quality loss from unnecessary recompression.

Why use custom targeting instead of presets like 50KB or 100KB?

Presets work for common use cases (passports, resumes). Custom targeting is for special requirements: your app's API accepts 175KB max, your CMS allows 2.3MB, your client spec requires exactly 500KB. We handle any target.

How does this differ from adjusting quality percentage manually?

Quality percentage doesn't directly correlate to file size - it varies by image content. Our tool reverse-engineers the exact quality needed to hit your target size, which is impossible to guess manually.

Can I use this in automated workflows or batch processing?

Currently, our tool is designed for individual images with unique targets. For batch processing with the same target, use our preset tools. For programmatic access, contact us about API availability.

What's the minimum and maximum file size I can target?

Practical range: 10KB to 20MB. Below 10KB, image quality suffers dramatically. Above 20MB, you rarely need compression. If you have extreme requirements, reach out for custom solutions.

Pro Tips

  • Start with a high-quality original - you can't add quality through compression
  • For web use, calculate target size based on your performance budget
  • Test at target size on actual deployment environment - behavior may vary
  • Document your exact targets in project specs for consistency across team
  • For critical applications, compress to 5% under limit as safety margin
  • Monitor quality score - if below 80%, consider relaxing your target slightly
  • Keep compression logs if you need to reproduce exact settings later
  • For A/B testing, create versions at 3-4 different sizes to find optimal balance

Related Tools

50KB Preset
100KB Preset
200KB Preset
Quality Focus
Batch Processing

Why Use Our Tool?

100% Private

All compression happens in your browser. Your images never leave your device.

Exact Size Targeting

Hit exact file sizes (50KB, 100KB, 200KB) with ±3% accuracy - perfect for government forms.

No Limits

Compress unlimited images with no restrictions. Batch processing supported.

Best Quality

Advanced algorithms maintain maximum quality while achieving target file size.