Image Compressor — Reduce File Size Without Losing Quality
Compress JPG, PNG, and WebP images to reduce file size. You can also compress PDF files with the same browser-based approach for faster websites, email attachments, and storage savings. Free, private, browser-based.
What This Tool Does
The Image Compressor reduces image file size by applying more aggressive compression settings. For JPG and WebP images, it adjusts the quality level — discarding image data that is difficult for humans to perceive. For PNG images, it applies lossless re-compression.
The quality slider lets you control the trade-off between file size and visual quality. For most web and email use cases, a quality setting of 75–85% produces files that look identical to the original while being 40–70% smaller.
How to Use the Image Compressor
- Upload your JPG, PNG, or WebP image
- Adjust the quality slider (85% is recommended as a starting point)
- Click Compress
- Compare the original and compressed sizes in the result
- Download the compressed image
Compression Levels Guide
| Quality Setting | Use Case | Expected File Size Reduction |
|---|---|---|
| 90–95% | Professional print, archival | 10–25% |
| 80–89% | High-quality web images | 25–50% |
| 70–79% | Standard web images (recommended) | 40–65% |
| 60–69% | Email thumbnails, small previews | 55–75% |
| Below 60% | Visible artifacts appear | More than 75% |
Why Compress Images?
Images are typically the largest assets on a web page. Uncompressed or poorly compressed images are one of the leading causes of slow website performance.
- Website speed — Google's Core Web Vitals score is significantly affected by image loading time. Smaller images directly improve LCP (Largest Contentful Paint).
- SEO impact — page speed is a Google ranking factor. Compressed images improve rankings.
- Email attachments — most email servers limit attachment size to 10–25MB; compression allows more images per email.
- Storage costs — cloud storage (AWS S3, Google Cloud) charges by data volume; smaller images reduce costs at scale.
- Mobile users — users on mobile data connections experience significantly faster loads with compressed images.
A practical example: a typical smartphone photo is 4–8MB. Compressed to 85% quality, it becomes 300–800KB — roughly 90% smaller — with no perceptible difference on screen.
Lossy vs Lossless Compression
There are two types of image compression:
Lossy compression (used by JPG and WebP) permanently removes some image data. The removed data is selected based on what the human visual system is least likely to notice — typically high-frequency details in smooth areas. Once compressed, the removed data cannot be recovered.
Lossless compression (used by PNG and GIF) reorganizes how image data is stored without removing any information. The compressed file can be perfectly decompressed to its original state. Lossless compression produces smaller files for graphics but larger files than lossy compression for photographs.
Privacy & Security
All compression happens in your browser using the HTML5 Canvas API. Your images are never uploaded to any server. This is important for compressing photos containing people, locations, personal information, or business content.
Common Problems & Fixes
- Compression artifacts visible — increase the quality setting. Artifacts typically appear at settings below 70%.
- PNG file not getting smaller — PNG uses lossless compression. For significant size reduction on photographic PNGs, convert to JPG or WebP first.
- File size is the same — the image may already be well-compressed. Try a lower quality setting.
- Colors look different after compression — increase quality to 90%+ to preserve color accuracy.
💡 Compression works best in combination with format conversion. Converting to WebP format before compressing often produces the smallest possible file size — WebP's compression algorithm is more efficient than JPG or PNG at equivalent quality. For combining compressed images into a PDF document, Image to PDF accepts any image format as input.
Related Guides & Tutorials
Compression in Your Image Workflow
Image compression works best as the final step after format conversion and resizing:
- Resize the image first — smaller dimensions mean less data to compress
- Convert JPG to PNG if you need lossless quality before editing, then compress the final output
- Convert PNG to JPG — JPG files compress to smaller sizes than PNG for photographic content
- Convert to WebP — WebP achieves better compression than both JPG and PNG with less quality loss
- Compress PDFs — use the same browser-based approach for PDF file size reduction
Frequently Asked Questions
Related Tools
- Have a WebP file? Convert WebP to JPG first, then compress for maximum compatibility. → convert WebP to JPG before compressing
- Combine multiple compressed images into an animated GIF. → create an animated GIF from your images
Image Format Guides
Not sure which format to use? These in-depth comparisons explain the tradeoffs: