About Compress Images Online
Reduce image file sizes with customizable quality settings. Compare original and compressed sizes instantly. Perfect for web optimization, email attachments, and social media. All processing runs locally — your images stay private. A faster, more private alternative to TinyPNG, iLovePDF, and SmallPDF image compression.
How to Compress Images Online
- Select your image file — JPEG, PNG, or WebP.
- Adjust the quality slider (10% to 100%).
- Click 'Process Files' to compress the image locally.
- Preview the result, verify quality, and download.
Frequently Asked Questions
Q.Will compression change my image format?▼
No. The output retains the same format as the input (JPG stays JPG, PNG stays PNG).
Q.How does the compression work?▼
PDFDock uses smart canvas re-encoding algorithms to optimize pixel data and strip unnecessary metadata without visible quality loss.
Q.Is image compression fully offline?▼
Yes. Once the page loads, all processing happens in your browser's memory with zero network activity.
Q.Can I compress multiple images at once?▼
Currently, images are processed one at a time for maximum quality control and preview accuracy.
Q.What's the best quality setting for web use?▼
For web images, 60-80% quality typically reduces file size by 50-70% while maintaining excellent visual clarity.
Q.How is PDFDock different from TinyPNG?▼
TinyPNG uploads your images to their servers for compression. PDFDock compresses entirely in your browser — no upload needed, unlimited files, and complete privacy.
PDFDock vs TinyPNG vs iLovePDF — Image Compression
Compress your images without uploading them to third-party servers. PDFDock offers unlimited, private image compression.
| Feature | PDFDock | Others |
|---|---|---|
| File Upload Required | No — browser-based | Yes — cloud processing |
| Quality Control | Full slider (10-100%) | Auto or preset only |
| Privacy | 100% private | Images on servers |
| Free Limit | Unlimited | 20 images/batch (TinyPNG) |
| Works Offline | Yes | No |
| Instant Preview | Yes | Download to check |
Related Tools
Your Privacy is Guaranteed
Browser image compression scales canvas metrics inside a client-side WebWorker.PDFDock operates 100% offline after the initial page load. We have no backend servers, no database, and no file storage. Your documents are processed entirely in your browser's memory and are never transmitted over the network. This makes PDFDock inherently compliant with GDPR, CCPA, HIPAA, and other global privacy regulations.