Image Compressor

Welcome to the Image Compressor — a powerful, browser-based tool that reduces image file sizes while maintaining visual quality. Whether you are optimizing images for a website, preparing photos for email, or freeing up storage space, this tool processes everything locally in your browser for complete privacy.

At a Glance

• Target size: compress to under 20 KB, 50 KB, 100 KB, 200 KB, 500 KB, 1 MB or 2 MB, or any size you type. 1 KB is counted as 1,000 bytes, so the file also passes upload forms that count that way.
• Formats: open JPG, PNG, GIF, WebP or BMP images and save them as JPEG, PNG (keeps transparency) or WebP.
• Resize while compressing: set a maximum width or height and larger images are scaled down in proportion.
• Batch: compress several images in one go and compare each result with the original on a before-and-after slider.
• Privacy: images are compressed in your browser and never leave your device.

How to Compress Images

1. Upload images: Drag and drop your images into the upload area, or click to browse. You can upload multiple files at once for batch processing.
2. Choose output format: Select JPEG for maximum compression, PNG for lossless quality with transparency, or WebP for modern browsers with excellent compression.
3. Adjust quality: Use the slider to set compression level (10-100). Lower values produce smaller files with more compression artifacts. Use the quick presets for common use cases.
4. Optional resize: Set a maximum dimension to proportionally resize oversized images while compressing.
5. Compress and download: Click "Compress" to process all images. Review results with visual savings gauges, then download individually or as a ZIP file.

Output Format Comparison

Quality Settings Guide

• 90-100%: Maximum quality — minimal compression, best for archival or print-quality images.
• 75-89%: High quality — good balance for photography and detailed images. Recommended for most uses.
• 50-74%: Medium quality — noticeable compression but acceptable for web thumbnails and social media.
• 10-49%: Low quality — maximum compression. Suitable for quick previews or when file size is critical.

Key Features

• 100% Client-Side: All processing happens in your browser. Your images are never uploaded to any server, ensuring complete privacy.
• Batch Processing: Upload and compress multiple images simultaneously with a single click.
• Multiple Formats: Output as JPEG, PNG, or WebP — choose the best format for your needs.
• Image Resizing: Optionally set a maximum dimension to resize large images while compressing.
• Visual Comparison: Use the before/after slider to compare original and compressed images side by side.
• Compression Metrics: See file size reduction with visual gauges, original/compressed sizes, and savings percentage.
• ZIP Download: Download all compressed images as a single ZIP file for convenience.

Why Compress Images?

Website Performance

Images typically account for 50-65% of a web page's total size. Compressing images can dramatically improve page load times, which directly affects user engagement, bounce rates, and search engine rankings. Google's Core Web Vitals specifically penalize pages with large, unoptimized images.

Storage and Bandwidth

Compressed images consume less storage space on your device and less bandwidth when shared via email or messaging. A photo reduced from 5 MB to 500 KB loads 10x faster and uses 10x less data.

Email Attachments

Most email services limit attachment size to 10-25 MB. Compressing images ensures your photos fit within these limits without sacrificing too much visual quality.

Frequently Asked Questions

Is this image compressor free to use?

Yes. Free visitors get 3 compression runs a day, and each free batch can contain up to 10 images, while Pro allows up to 50 images per batch and Premium has no limit on images per batch; re-compressing the same images with different settings does not count again. Downloading a batch as one ZIP is a Pro feature, while each image can always be downloaded on its own. All processing happens in your browser, so your images are never uploaded to any server.

What image formats are supported?

You can upload JPG, PNG, GIF, WebP, BMP, and other common image formats. You can choose to output as JPEG (best compression), PNG (lossless with transparency), or WebP (modern format with excellent compression).

Are my images uploaded to a server?

No. All image compression is performed entirely in your browser using the JavaScript Canvas API. Your images never leave your device, ensuring complete privacy and security.

What quality setting should I use?

For web images, 70-80% quality offers the best balance of file size and visual quality. For photography or print, use 85-95%. Below 60% you may notice visible artifacts. The tool shows a real-time comparison so you can judge the quality yourself.

Can I resize images while compressing?

Yes. You can set a maximum dimension (width or height) and the tool will proportionally resize any image that exceeds that limit while maintaining the original aspect ratio. This is useful for preparing images for web upload where specific size limits apply.

How do I compress an image to a specific size, like 100 KB?

Choose a Target File Size, such as Under 100 KB, and press Compress. The tool tries qualities until it finds the highest one that fits, and only makes the image smaller in pixels if even a low quality is still too big. It counts 1 KB as 1,000 bytes, so the result also passes upload forms that count 1,024. For the smallest files choose WebP or JPEG; PNG is lossless, so resizing is the only way to shrink it.