ConvertDuck

Image Compressor

Reduce image file size while maintaining quality.

Drop PNG, JPG, WEBP files here.

Quality / Max Size
No images selected.

Reduce Image Size Without Losing Quality

Slow-loading images hurt your website's SEO and frustrate users. This tool uses your device's own processing power (via Web Workers) to compress images locally. By eliminating server uploads, we ensure your files never leave your computer—guaranteeing 100% privacy while typically reducing file sizes by 60-80% for faster web performance.

How to Compress Images in 3 Steps

1. Select or Drop Images

Drag up to 50 images at once into the dropzone. We support PNG, JPG, and WebP formats.

Pro Tip: Batch processing works best on desktop computers with multi-core processors.

2. Choose Compression Level

Select 'Balanced' for the best size-to-quality ratio, or 'Aggressive' if file size is your priority.

Use 'Balanced' for blog posts and 'Aggressive' for thumbnails.

3. Download ZIP

Once processing finishes, download all optimized images in a single ZIP file.

Why Professionals Use This Tool

  • ✓ 100% Browser-Based Privacy

    Unlike other tools, we don't send your photos to a cloud server. Compression happens locally using HTML5 Canvas, so your sensitive data stays on your device.

  • ✓ Parallel Processing

    We utilize multi-threading technology to compress multiple images simultaneously, making it significantly faster than traditional server-side queues.

  • ✓ WebP Conversion Support

    Automatically optimizes standard formats. If your input allows, the engine attempts to find the most efficient encoding structure.

  • ✓ Offline Capability

    Since the code loads once into your browser memory, you can continue compressing files even if you lose your internet connection.

System Requirements

Supported Formats JPG, JPEG, PNG, WebP
Browser Support Chrome 90+, Firefox 88+, Safari 14+, Edge
Max File Size Tested up to 50MB per image (device dependent)
Output Format Original format maintained (inside ZIP archive)

Local Browser vs. Cloud Compression

Feature This Tool (Local) Typical Cloud Converters
Data Privacy Files never leave device Files uploaded to server
Speed Instant (Zero Latency) Slow (Upload + Download time)
Limit Hardware dependent only Often limited (e.g., 20 files/day)
Offline Use Yes, fully functional No, requires internet

Frequently Asked Questions

Q. Does this tool remove EXIF metadata? ▼
Yes, to achieve maximum file size reduction, metadata (like GPS location and camera settings) is stripped during the compression process.
Q. Why is my compressed PNG larger than the original? ▼
This rarely happens, but if your original image was already highly optimized, re-encoding it might add overhead. In these cases, our tool automatically discards the result and keeps your original file.
Q. Is it safe for sensitive legal documents? ▼
Absolutely. Since no file is ever transmitted over the network, it is mathematically impossible for us or hackers to intercept your documents during the process.
Q. Will this slow down my computer? ▼
It might briefly increase CPU usage while processing, especially if you select 'Aggressive' mode for 50+ images, but it frees up resources immediately after completion.