Compress Images Online for Free
Use Plomz to compress JPG, PNG, and WebP images in your browser and reduce file size without unnecessary quality loss. Choose a compression level that fits your needs—smaller files for faster uploads, email attachments, and web pages, or higher quality for print and portfolios.
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Image Compression: Compress File Size Without Losing Quality
You can batch-compress up to 30 images at once, preview results, and download the optimized files immediately. Compression works by removing extra data and simplifying image details, so the best setting depends on your content: photos usually tolerate stronger compression, while logos and screenshots may need lighter compression to keep edges crisp. We process files temporarily to complete the task and this page is designed to help you understand what the tool does before you start.
Slow websites lose visitors. Image compression is one of the fastest ways to speed up your site and improve SEO without sacrificing image quality.
Why Compress Images?
Compressing images allows you to:
reduce page load time,
improve SEO rankings,
save storage space, and
deliver faster user experiences.
Smaller images = faster websites = happier users.
How to Compress Images
Use this online image compressor to upload your images and automatically reduce file size while preserving visual quality.
What Is the Technical Process Behind Image Compression?
The technical process behind image compression begins when software decodes the original image file to reconstruct its pixel data in memory. The compressor then analyzes the image to identify redundant and less visually important information. In lossy compression, the algorithm removes some data that the human eye is less likely to notice, significantly reducing file size while maintaining acceptable image quality. In lossless compression, the algorithm reorganizes and encodes the pixel data more efficiently without discarding any information. The processed data is then re-encoded using the selected compression format (such as JPG, PNG, or WebP) and finally written to disk, producing a smaller file that loads faster while preserving the best possible visual clarity and performance.
Compress images without noticeable quality loss
Image compression reduces file size while preserving visual clarity. Plomz helps you compress images efficiently for faster websites, lower bandwidth usage, and better performance across devices.
Why image compression matters
Large images are one of the most common causes of slow websites. Uncompressed or poorly optimized images increase page weight, delay rendering, and negatively impact user experience and search rankings.
- Faster page loads: Smaller images load quicker, especially on mobile networks.
- Improved SEO: Image size directly affects Core Web Vitals such as LCP.
- Lower bandwidth usage: Reduced data transfer saves hosting costs and user data.
- Better user experience: Pages feel more responsive and polished.
How image compression works at a technical level
When an image is compressed, the compression engine analyzes pixel data to identify information that can be reduced or optimized without noticeably affecting visual quality.
- Lossy compression: Reduces file size by selectively discarding visual details the human eye is less sensitive to, commonly used for JPG images.
- Lossless compression: Reorganizes image data without removing information, typically used for PNG images and graphics.
- Metadata optimization: Optional removal of non-essential metadata to further reduce file size.
Real-world use cases
- Web developers: Developers compress images to reduce page size, improve rendering speed, and meet performance budgets for modern web applications.
- Bloggers and content creators: Compressing images ensures fast loading posts without sacrificing visual quality for readers.
- E-commerce teams: Product images are compressed to maintain clarity while ensuring category pages load quickly on mobile devices.
- Marketing teams: Compressed images help landing pages load faster, increasing conversion rates and reducing bounce rates.
Security & privacy
Plomz is built with a privacy-first approach. Images are processed temporarily for compression and are never stored permanently or shared with third parties.
- Encrypted transfer: Files are uploaded over secure HTTPS connections.
- Temporary processing: Images exist only long enough to complete compression.
- Automatic deletion: Files are removed from the system as soon as job completes.
Frequently Asked Questions
Will image compression reduce quality?
When configured correctly, compression reduces file size with little to no visible difference. Plomz balances size reduction and visual clarity.
Is image compression good for SEO?
Yes. Smaller images improve page load speed and Core Web Vitals, which are ranking signals used by search engines.
Can I compress multiple images at once?
Yes. Plomz supports batch image compression to save time when optimizing large sets of images.
Are my images stored on your servers?
No. Uploaded images are processed temporarily and automatically deleted as soon as job completes.
Does this work on mobile devices?
Yes. Plomz works on modern smartphones and tablets without installing any software.
Built for performance-focused teams
Plomz is developed by engineers who care about performance, privacy, and practical web optimization. Image compression is treated as a deliberate optimization step—not an afterthought.
Tip: If your image still feels large, try reducing dimensions with the Image Resizer first, then compress again for the best balance between clarity and file size.
Our Popular tool: Resize image · Remove image background · Convert HEIC image to jpg
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