Image Optimizer
Compress, resize and convert JPEG, PNG and WebP.
About This Tool
This tool makes your images smaller, so pages load faster and files are easier to share. It can also resize them and change the format.
- Works with JPEG, PNG and WebP.
- Processes up to 100 images at once.
- Shows the size before and after for every file.
- Your images never leave your device.
How to Use This Tool
- Click the upload area or drag your images onto it.
- Choose an output format, then set Compress and Resize.
- Press Optimize Images.
- Download each file, or press Download All as ZIP.
Press Clear Canvas to start over with new images.
Options Explained
- Output is the format of the new files: WebP, JPEG or PNG. Your original files are not changed.
- Compress sets how hard the tool shrinks each file. For WebP and JPEG, a higher value gives a smaller file with a little less quality. At 20% the picture keeps 80% of its quality. For PNG the picture never changes, and the slider shows levels L-1 to L-6. Higher levels try harder to shrink the file and take longer.
- Resize limits the width, from Max 3840 px down to Max 150 px. Wider images shrink to that width and keep their shape. Narrower images are left alone. Choose Custom scale to set a percentage instead.
- Scale shows up with Custom scale. It sets the new size as a percentage of the original, from 1% to 100%.
Which Format Should I Choose?
- WebP gives the smallest files for websites. All current browsers support it.
- JPEG suits photos and works everywhere. It has no transparency, so transparent areas turn white.
- PNG suits screenshots, logos and anything with transparency. It is lossless, but files are usually larger than WebP.
Tips for Smaller Files
- Resize first. A smaller image is the biggest saving.
- Start with the default 20% compress. Raise it a little at a time until you notice a difference.
- Check the size shown for each file. Green means smaller. Red means larger, so keep your original.
- If the page slows down, process fewer files at a time.
Privacy: How This Tool Works
- Your browser does all the work. No image is uploaded.
- Nothing is stored or shared.
- Your files disappear when you close the tab.
Frequently Asked Questions
Are my images uploaded to a server?
No. Your browser does all the work with your device's own memory and processor. Your images never leave your device, so this is safe for private photos and documents.
What does the Compress slider do?
For JPEG and WebP it sets how much quality is traded for size: 20% compress keeps 80% quality. PNG is always lossless, so the picture does not change. For PNG the slider sets how hard the tool works (levels L-1 to L-6). Higher levels try harder to shrink the file and take longer.
Can the optimized image be larger than the original?
Yes, if the original is already well compressed or you convert to a heavier format. Each result shows its size in green when smaller and red when larger, so you can keep the original whenever the new file is not an improvement.
Will Resize make a small image bigger?
No. Max width only makes images smaller. An image that is already narrower keeps its size. Custom scale goes from 1% to 100%, so it cannot enlarge an image either.
What happens to transparency and photo details?
JPEG has no transparency, so transparent areas turn white when you choose JPEG. Images are re-encoded, so camera details and GPS location are not carried over.
How many images can I process at once?
Up to 100 files per batch, each up to 100 MB and 500 MB in total. Each side of an image can be up to 16,384 px. Download the results one by one or all together as a ZIP.
Which format should I choose?
WebP gives the smallest files for websites and works in all current browsers. Choose JPEG for maximum compatibility with photos, and PNG for screenshots, logos and anything that needs transparency.
Do my files keep their names?
Yes. Each file keeps its name and gets the new extension. The ZIP is called optimized-images.zip.
Does it work with animated images?
No. Only still images are supported, and an animated WebP is saved as a single still frame.
Explore More Tools
-
Password Generator Strong passwords & passphrases
-
PDF Optimizer Compress & merge PDFs
-
Winner Picker Fair, random giveaway draws