Online Image Compressor Free
The best free image compressor to reduce image size kb instantly. Compress image size online with zero quality loss.
Upload Image to Compress
Supports JPG, PNG, and WebP up to 10MB
Built With Care
“Compression runs in a Web Worker using the browser-image-compression library, which draws the image to a canvas at a target maximum dimension of 1920px and re-encodes it with the quality level you set. This keeps large photos under the 2MB target while preserving visible detail.”
Compress Image Size Online
Reduce image file size directly in your browser by adjusting quality, with instant preview and a side-by-side size comparison. Supports JPG, PNG, and WebP files up to 10MB and targets a 2MB output at a 1920px maximum dimension. The optimized file downloads ready for the web.
- 1Click Select File and choose a JPG, PNG, or WebP image up to 10MB.
- 2Wait for the initial compression, which targets a 2MB file at a 1920px maximum dimension.
- 3Adjust the Quality Target slider between 10% and 100% to balance size against detail.
- 4Compare the original and compressed file sizes shown side by side.
- 5Review the preview for artifacts in gradients, skin tones, or fine textures.
- 6Click Download Compressed Image to save the optimized file.
- Web Worker Processing: Compression runs off the main thread so the page stays responsive.
- Quality Control: A slider from 10% to 100% triggers re-compression instantly.
- Size Comparison: Original and compressed sizes display with the reduction percentage.
- Format Coverage: JPG, PNG, and WebP inputs with format-aware re-encoding.
- Dimension Capping: Long edges are resized to 1920px to control output weight.
- Browser-Only Processing: Files are processed locally in your browser and are not uploaded.
Compress Image Size Online Specs
Limits
- Batch compression
- Quality slider from 0–100
Formats
- Input: PNG, JPEG, WebP
- Output: compressed same-format or WebP
Defaults
- Quality 70
- Resize option off
How it works
- Canvas re-encode
Honest caveats
- PNG photos compress best as JPEG/WebP
- Quality below 40 shows artifacts
Real Ways People Use This
Faster Website Loading
Compress images before uploading them to WordPress, React, or static sites to improve Largest Contentful Paint and page speed scores.
Email Attachments
Shrink high-resolution photos below the 25MB limit of Gmail and Outlook so they send without further server-side compression.
Social Media Uploads
Optimize files for Instagram, Twitter, or LinkedIn, where oversized uploads get recompressed or rejected.
Storage Space Saver
Reduce the footprint of your photo library on a hard drive or cloud plan while keeping full-resolution originals archived.
Client Deliverables
Send optimized proofs by email quickly while retaining the full-resolution original for final delivery.
- Aggressive quality settings can introduce artifacts in gradients, skin tones, and detailed textures.
- Files larger than about 10MB may take a while to process — pre-resize them first for the fastest result.
- PNG output shrinks less than JPG or WebP because PNG re-encoding preserves detail by design.
- 1Set quality based on the destination: 60-80% for the web, lower for email attachments.
- 2Zoom into detailed areas of the preview to check for compression artifacts.
- 3Confirm the size reduction before downloading, then test the file on the target platform.