1. What is Compression Ratio?

The compression ratio measures how much an image file size has been reduced through compression. It indicates the percentage reduction in file size from the original to the compressed version.

2. How Does the Calculator Work?

The calculator uses the compression ratio formula:

Where:

• Original Size — Size of uncompressed image in bytes
• Compressed Size — Size of compressed image in bytes

Explanation: The formula calculates the percentage reduction in file size achieved by compression.

3. Importance of Compression Ratio

Details: Compression ratio helps evaluate the effectiveness of image compression algorithms. Higher ratios indicate more efficient compression, though quality must also be considered.

4. Using the Calculator

Tips: Enter both original and compressed sizes in bytes. The compressed size must be less than or equal to the original size for valid results.

5. Frequently Asked Questions (FAQ)

Q1: What's a good compression ratio for images?
A: Typical lossless compression ratios are 10-50%. Lossy compression (JPEG) can achieve 50-90% while maintaining acceptable quality.

Q2: Does higher compression always mean better?
A: Not necessarily. Higher compression often reduces image quality. The optimal ratio balances file size reduction with quality requirements.

Q3: How do I find image file sizes?
A: Right-click the image file, select Properties (Windows) or Get Info (Mac) to see the size in bytes.

Q4: What affects compression ratio?
A: Image content (complexity, colors), compression algorithm, and quality settings all affect the ratio.

Q5: Can compression ratio exceed 100%?
A: No. The maximum theoretical ratio is 100% (compressed size = 0 bytes), which is impossible in practice.