Why RocketCat Image Compressor?
100% Private
Your images are compressed entirely in your browser using the Canvas API. Nothing is uploaded to any server.
Batch Processing
Drop multiple images at once. Compress dozens of photos in one go with a single click.
Instant Results
No waiting, no queues, no server processing. Your images compress in milliseconds, right on your device.
WebP, JPEG, PNG
Convert between formats. WebP for best compression, JPEG for compatibility, PNG for transparency.
Perfect For Every Situation
Compress Images for Websites
Speed up your website by reducing image file sizes. Smaller images mean faster page loads, better SEO rankings, and lower bounce rates. Convert to WebP for the best web performance.
Compress Photos for Email
Email providers typically cap attachments at 25 MB. Batch-compress your photos down to email-friendly sizes while keeping them sharp.
Resize for Social Media
Instagram, Facebook, and Twitter auto-compress uploads — often badly. Compress and resize to the right dimensions yourself for predictable quality.
Shrink iPhone & Android Photos
Modern phone cameras produce massive 5-15 MB photos. Compress them to under 1 MB for sharing, storing, or uploading.
Reduce Before Printing
Large photo prints don't need the original 20 MP resolution. Resize to what the printer needs — faster uploads, same result.
WebP vs JPEG vs PNG
| Format | Best For | Compression |
|---|---|---|
| WebP | Websites, modern apps | Excellent |
| JPEG | Universal compatibility, photos | Very Good |
| PNG | Graphics, transparency, logos | Lossless |
Frequently Asked Questions
Is RocketCat Image Compressor free?▾
Yes, completely free with no limits. No signup, no watermark, unlimited compressions.
Are my images uploaded anywhere?▾
No. The compression happens entirely in your browser using the HTML Canvas API. Your images never leave your device.
What image formats are supported?▾
Input: JPG, PNG, WebP, GIF, BMP, and any format your browser can display. Output: WebP, JPEG, or PNG.
How much can I compress an image?▾
Typically 50-80% size reduction with visually identical results. WebP at 80% quality usually gives the best balance.
Can I compress multiple images at once?▾
Yes! Drag and drop as many images as you want — they all get processed in parallel.
What's the difference between WebP and JPEG?▾
WebP is a modern format with ~30% better compression than JPEG at the same quality. JPEG has wider compatibility with older software.
Does compression reduce image quality?▾
Yes, but usually imperceptibly. At 80% quality, most people can't tell the difference between the original and compressed version.
Can I resize images?▾
Yes. Choose a max width (480px, 800px, 1280px, 1920px, or keep original). Images larger than the max will be scaled down proportionally.
Does it work on mobile?▾
Yes, works in any modern mobile browser. Perfect for compressing photos straight from your phone.
Can I change settings and recompress?▾
Yes! Adjust quality, format, or max width and click 'Re-process all' to apply new settings to all loaded images.