How does this compressor differ from sites that upload your images to their servers?
The main difference is where the work happens. Here the image is opened and compressed inside your browser, so it never leaves your device and there is no upload or download to wait for, but speed depends on your device. Some server-based services offer options this tool does not, such as optimizing PNG files while keeping them PNG, whereas this tool outputs JPEG or WebP only.
Point by point
- Where processing happens: here, in the browser using Canvas. Elsewhere, usually on a server after your image is uploaded to it.
- Privacy: here, the image is not sent anywhere. There, a copy of your image sits on a machine you do not control, and its deletion depends on the site's policy.
- Waiting: here, there is no upload or download over the internet, so results appear as soon as processing finishes. There, you wait for big images to upload and results to download, which drags on a weak connection.
- Raw speed: here, it depends on your device, so a computer beats an old phone. There, it depends on the site's server and how busy it is.
- Output formats: here, JPEG or WebP only. Some other services offer extra formats or modes.
- Limits: here, 30 images at a time, 40 MB and 50 megapixels per image. Other services set their own, sometimes with daily caps or a subscription.
What this tool does not do, honestly
- It does not save PNG output, and it does not optimize a PNG while keeping it PNG. If you have a logo or flat graphic that must stay PNG, this is not the tool for it.
- It has no 'target size' box that compresses automatically to a set figure. You move the quality slider and see the real size.
- It does not reduce dimensions. There is a separate tool for resizing.
- It does not keep your images or settings between visits.
When to pick which
Choose the Image compressor when the images are private or sensitive, such as document photos or products not yet launched, when your connection is slow or on limited data, and when you want to see the real size of each image before downloading along with a plain warning if a file grows. A server-based service may suit you when you need an optimized PNG that stays PNG, or automatic compression to a set size, and the images are ordinary ones you do not mind uploading. If all you need is to change a file's format, the Image format converter is built for that.
How to check any online tool
- Read the tool's page: does it say plainly where processing happens?
- On a computer, open the Network tab in developer tools, compress an image, and see whether any request carries a file the size of your image.
- Watch for an 'uploading' progress bar: if you see one, the image is leaving your device.
Common questions
Is in-browser compression lower quality than server compression?
Not necessarily. Quality depends on the encoder and the setting you choose, and each tool uses a different encoder. Compare the result with your own eyes.
Does the tool work offline?
The page needs to load first. The processing itself does not send your images over the internet.
Do I need an account?
No, the tool is free and needs no sign-up.