How to Use Image Compressor
- Step 1: Select or drop your image into the compressor workspace.
- Step 2: Choose a compression preset (Low, Medium, High, Extreme) or set a custom Target KB limit.
- Step 3: Adjust the quality slider to balance visual fidelity and file size reduction.
- Step 4: Compare before and after sizes in real time, then download your compressed image.
Settings & Controls Explained
One Resizer's Image Compressor provides specialized browser-local controls tailored to its workflow:
- Compression Presets: Quick-select levels from Low (maximum quality) to Extreme (maximum size reduction).
- Target KB Mode: Enter an exact file size target, and the compressor automatically determines optimal quality parameters.
- Quality Slider: Granular control over lossy quantization percentage (1% to 100%).
- Live Size Comparison: Displays original size, compressed size, and total reduction percentage instantly.
Supported Formats & Technical Capabilities
| Specification | Technical Capability |
|---|---|
| Accepted Input Formats | JPG, JPEG, PNG, WEBP |
| Output File Formats | JPG, PNG, WEBP |
| Processing Engine | Client-Side Canvas Encoding |
| Network Privacy | Local browser processing (0 bytes uploaded) |
Best Practices & Key Recommendations
- Use WEBP output for web publishing to achieve up to 30% smaller sizes than JPG at comparable quality.
- For photos with rich gradients, Medium compression (around 80% quality) produces virtually indistinguishable results with 60–80% size savings.
- For transparent graphics, keep PNG format and use moderate compression.
Troubleshooting & Common Issues
- Compressed PNG is still large: PNG uses lossless compression; for aggressive size cuts, convert to WEBP or JPG.
- Visible artifacts in gradients: Increase the quality slider to 85% or higher to eliminate banding in smooth skies and shadows.