Image Compressor

Getting Started

The Image Compressor combines powerful compression technology with complete privacy, showing you exactly how much space you'll save before downloading your optimized images.

Quick Start Guide

1. Configure your compression settings (format, quality, dimensions)
2. Drag and drop your images or click "Drop images here or click to browse"
3. Images process automatically if auto-process is enabled, or click "Process Images"
4. Preview before/after comparisons by clicking any image thumbnail
5. Download individual images or use "Download All" for batch processing

Key Features

Compression Settings

Output Format Options

• JPEG: Best for photographs - highest compression ratios, no transparency support
• PNG: Lossless compression - perfect for graphics with transparency or text
• WebP (Lossy): Modern format with 25-35% better compression than JPEG
• WebP (Lossless): Superior lossless compression compared to PNG

Quality Settings

• JPEG & WebP Lossy: 10-100% quality slider (higher = better quality, larger file size)
• PNG & WebP Lossless: Quality setting disabled (lossless formats preserve original quality)

Resize Options

• Max Width: Optional dimension limit to reduce file size further
• Auto-Process: Automatically compress images when uploaded
• Leave max width empty to maintain original dimensions

Detailed Usage Guide

Loading Your Images

Upload images using any of these methods:

• Drag & Drop: Drag multiple image files directly onto the upload area
• File Browser: Click the upload area to open your file browser
• Batch Upload: Select multiple images at once for simultaneous processing

Understanding the Interface

Controls Panel: Configure compression settings, format, quality, and processing options on the left side.

Drop Zone: Main area displays upload placeholder initially, then shows grid of image thumbnails after upload.

Image Thumbnails: Each shows original file size, compression progress, final savings percentage, and action buttons.

Stats Summary: Appears after processing, showing total files, average savings, and before/after file sizes.

Using Batch Processing

1. Upload multiple images (up to 50MB each)
2. Configure desired settings for all images
3. Enable "Auto-process on upload" for immediate compression
4. Or click "Process Images" to compress all at once
5. Use "Download All" to get all compressed images

Live Comparison Preview

Click any processed image thumbnail to open the comparison modal:

• Interactive Slider: Drag to compare original vs compressed side-by-side
• View Modes: Switch between "Fit to Screen" and "100%" zoom
• Quality Assessment: Inspect compression quality at pixel level
• Savings Display: See exact file size reduction and percentage saved

Supported File Formats

Input Formats

• JPEG/JPG: Standard photography format
• PNG: Graphics with transparency support
• WebP: Modern web format (both lossy and lossless)
• GIF: Simple graphics (static images only)
• BMP: Windows bitmap format
• TIFF: High-quality photography format

Output Formats

• JPEG: Best compression for photos, no transparency
• PNG: Lossless compression, supports transparency
• WebP: Modern format with superior compression efficiency

Format Recommendations

• For websites: WebP when supported, JPEG for photos, PNG for graphics
• For social media: JPEG works universally across platforms
• For maximum compression: WebP lossy at 70-80% quality
• For preserving quality: PNG or WebP lossless

Performance & Privacy

Local Processing Benefits

• Complete Privacy: Images never uploaded to any server
• Instant Processing: No waiting for uploads or downloads
• No File Limits: Process images up to 50MB each
• Offline Capable: Works without internet after initial page load
• Unlimited Usage: No account required, no usage restrictions

File Size Limits

• Maximum individual file size: 50MB
• No limit on number of files processed
• Large files may take longer to process but will work
• For files over 50MB, use an image editor to reduce size first

Browser Compatibility

Works in all modern browsers:

• Chrome 60+
• Firefox 55+
• Safari 11+
• Edge 79+

Troubleshooting

Common Issues

Images won't load:

• Verify file is a supported format (JPEG, PNG, WebP, GIF, BMP, TIFF)
• Check file size is under 50MB limit
• Try refreshing page and uploading again

Compression seems minimal:

• Some images are already well-optimized
• Try lowering quality setting for more aggressive compression
• Consider format conversion (JPEG to WebP) for better results
• Images with trophy icon are already optimized

Preview comparison not working:

• Ensure image has finished processing (no loading spinner)
• Try clicking the eye icon instead of thumbnail
• Check browser supports HTML5 Canvas

Best Practices

• Start with high-quality originals for best results
• Use appropriate quality settings: 70-85% for most photos
• Choose optimal formats: WebP for modern web, JPEG for compatibility
• Test compression levels: Use preview to find quality/size balance
• Batch similar images: Use same settings for photos of similar type

Frequently Asked Questions

Is compression really lossless for PNG/WebP Lossless?

Yes, lossless formats preserve 100% of original image data. File size reduction comes from more efficient encoding, not quality loss.

Can I undo compression?

No, compression permanently alters the file. Always keep original files as backups when needed.

Why choose this over other compressors?

Complete privacy (no uploads), unlimited usage, batch processing, live comparisons, and support for modern formats like WebP.

How much compression can I expect?

Typically 30-70% for JPEG photos, 10-40% for PNG graphics, and 25-35% better than JPEG when using WebP.

Does this work on mobile devices?

Yes, but larger screens provide better experience for the comparison preview feature. Upload and compression work on all devices.

Are there any usage limits?

No limits on number of images, processing time, or file sizes (up to 50MB). Completely free with no restrictions.