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Image Optimizer

Compress images to a target file size or custom quality, with resize control.

Result

Original: - → Compressed: - (-)

⬇️ Download Optimized Image

Free Image Optimizer — Compress Images to Your Target Size

Large images slow down websites and fill up storage unnecessarily. Our free Image Optimizer reduces file size using adjustable JPEG quality and resizing — including a smart Target Size mode that automatically searches for the right compression level to hit a specific file size in KB.

Why Use This Tool

  • Target Size mode: Set a KB goal and let the tool find the right quality automatically.
  • Manual quality control: Or set your own compression percentage directly.
  • Resize option: Reduce dimensions alongside compression for smaller files.
  • Before/after comparison: See exactly how much you saved.

Key Features

Smart Target Size Search

Binary search finds the right quality.

Resize Slider

Reduce dimensions for smaller files.

Step-by-Step: How to Use

Step 1: Upload your image.

Step 2: Choose Manual Quality or Target Size mode.

Step 3: Adjust the quality slider or enter your target KB size.

Step 4: Download your optimized image and compare the size reduction.

Benefits

  • Improves website loading speed and Core Web Vitals scores.
  • Reduces storage space needed for large photo collections.
  • Makes images easier and faster to share via email or messaging apps.

Common Use Cases

  • Compressing website images to meet a specific size limit for faster loading.
  • Shrinking photos before uploading to platforms with file size restrictions.
  • Reducing email attachment sizes for large photos.
  • Optimizing product images for e-commerce listings.

Privacy & Security

Reduces image file size using adjustable JPEG quality and resizing. Target Size mode automatically searches for the best quality setting to get as close as possible to your desired file size. All processing happens locally in your browser.

Supported Formats

Accepts JPG, PNG, and WebP images. Output is delivered as an optimized JPEG file for maximum compression control.

Frequently Asked Questions

How does Target Size mode work? +
It automatically tries different quality levels (binary search) until the output size is close to your target, without going over.
Manual sets a direct percentage; Target Size finds the quality needed to hit a KB goal.
Yes, excessive resizing reduces detail visible when zoomed in.
JPG, PNG, and WebP — output is an optimized JPEG.
Smaller files load faster, improving page speed and Core Web Vitals.
Yes, original size, new size, and percentage reduction are shown.
Very small targets may cause visible quality loss.
Yes, completely free with no limits.
No, all compression happens locally using HTML5 Canvas.
This tool handles one at a time; use Bulk Image Converter for multiple files.

Related Tools

Also try our JPG to PNG Converter and Bulk Image Converter.

Ready to optimize your image? Upload it above — free and instant.

Share Your Experience

Found this tool useful? Have a suggestion or found a bug? Send your feedback directly to us — we read every message.