Private image compression
Compress images without uploading them to a server
Every megabyte counts on a slow connection. The image compressor shrinks JPG, PNG, and WebP files in your browser, so the original never leaves your device.
Compress an image in your browser
A repeatable workflow that balances file size and appearance.
Add the image
Open the image compressor and select the JPG, PNG, or WebP file.
Set the quality
Start at 80 percent for photos and compare the size shown next to the original.
Check the preview
Zoom into edges and gradients to confirm there are no visible artifacts.
Download the result
Save the optimized image and replace the original in your site folder or message.
Ways to slim down an image
The best approach depends on what the image is and where it will be used.
Compress the format
Re-encode the image at a sensible quality level with the image compressor. Most photos drop 50 to 80 percent at 80 percent quality.
Best first step for any imageResize dimensions
An image displayed at 800 pixels does not need 4000 pixels of data. Resize first with the image resizer, then compress.
Best when the image is shown smallSwitch format
Moving PNG photos to JPG or WebP often saves more than compression alone, using the image converter.
Best for PNG photos and graphicsRealistic size targets
Use these as working targets: under 300 KB for hero images, under 200 KB for content images, and under 50 KB for thumbnails. Images over 1 MB are almost always too heavy, whatever the page.
Compression has limits: an image that is already heavily compressed shrinks little, and graphics with fine text degrade before photos do. When the file is still too large, resize the dimensions before blaming the compressor.
Spotting compression artifacts
Artifacts show as blocky patches near edges, ringing around text, and banding in smooth gradients. They appear when quality is set too low or an image is compressed repeatedly. The preview step exists to catch them before you publish.
- Zoom to 100 percent and inspect text edges and photo boundaries.
- Check smooth areas such as skies for banding.
- If artifacts appear, raise quality and convert again from the original.
Jump to tool
Slim down your images now
Open the image compressor, drop in your files, and download lighter versions. Free, local, and ready in seconds.
Open Image CompressorWhy image-heavy pages lose visitors
- Slow loading frustrates users and increases bounce rates
- Large images inflate mobile data costs for visitors
- Search engines penalize slow pages in ranking signals
- Email attachments over a few megabytes bounce from many mail servers
Optimization recommendations
- Compress at 75 to 85 percent quality for web photos
- Resize to the largest display size before compressing
- Serve WebP with a JPG fallback for modern browsers
- Keep masters untouched and compress copies
Frequently asked questions
What is the best quality setting?
75 to 85 percent for photos viewed on screens. At 80 percent most images look identical to the original while the file drops by half or more. Higher settings are for print and fine graphics.
Can I compress PNG images too?
Yes. The image compressor handles JPG, PNG, and WebP. PNG files with photos and gradients benefit most; flat-color graphics compress less.
Why is my compressed image still large?
Usually the dimensions are too big, not the encoding. A 4000 pixel photo compresses to a large file even at low quality. Resize it with the image resizer first, then compress.
Is local compression really private?
Yes. The browser reads the image into memory on your device, re-encodes it there, and offers the result as a download. No image data is sent to any server.
Local-only image optimization
Image Compressor re-encodes images in browser memory on your device. No file content is uploaded, stored, or shared with the server.
Open Image Compressor