Compress Images Without Uploading Them
Shrink photos and graphics with a quality slider, or tell ImageSpark the file size you need, such as 100 KB, and it finds the best quality that fits. Compression runs on your own device, so your images are never sent to a server and there's no upload queue to wait for.
Your image is processed by your own browser and never uploaded. Many online editors send your photo to their servers and delete it later — this one never receives it at all.
Why use Compress Image
- Quality slider or a target file size such as 100 KB
- Automatic, JPG, WebP or AVIF output
- Before-and-after size comparison
- Offers your original back if the result would be larger
- Runs 100% in your browser — images never leave your device
- Pro: batch-compress up to 100 images in one job
- Custom width and height caps
- Pro batch before/after previews and a keep-original choice
- SVG and ICO input
Popular uses
- Shrinking phone photos before attaching them to an email
- Making product and blog images load faster on your website
- Getting a picture under an upload limit on a job or visa portal
- Saving storage space before archiving large photo folders
Compress Image: frequently asked questions
Does compressing an image reduce its quality?
Yes, a little — compression uses lossy JPG, WebP or AVIF encoding, which discards detail the eye rarely notices. Between roughly 60% and 80% quality, most photos look the same on screen at a much smaller size. Very low settings or tiny target sizes can show blockiness, so compare the result before you download it.
How do I compress an image to 100 KB or 200 KB?
Choose Target file size and pick 100 KB or 200 KB, or enter your own limit. ImageSpark searches for the highest quality that fits and, if that isn't enough, reduces the pixel dimensions too, then shows the final size. Targets such as 20 KB or 50 KB for online forms work the same way.
Are my images uploaded to a server?
No. ImageSpark decodes and re-encodes your image with your browser's built-in canvas engine, entirely on your device. The file never travels over the network, so there is nothing for us to store, log, or delete later. You can even disconnect from the internet after the page loads and the compressor keeps working.
Should I choose JPEG or WebP?
Choose WebP when the image is going on a website or app, because it's typically smaller than JPEG at the same visual quality and every modern browser supports it. Choose JPEG when you need maximum compatibility, such as older software, some government portals, or printing services that only accept .jpg files.
Can I compress PNG files?
Yes. PNG, AVIF, GIF and BMP files are accepted and saved as JPG, WebP or AVIF, which is usually far smaller than the original PNG. JPG doesn't support transparency, so transparent areas are filled with white; pick WebP if you need to keep a transparent background. Animated GIFs are flattened to their first frame.
Can I compress multiple images at once?
Batch compression is part of ImageSpark Pro and Lifetime: drop up to 100 images, set the format and quality once, and process them as a queue before downloading each result. On the free plan you can compress one image at a time, up to 5 operations per day, with no account required.