Image optimizer

Image optimizer is a free tool that compresses image files to reduce their size while aiming to maintain high visual quality.

What happens after I choose a file?

The image travels over HTTPS to the server, where the work is performed, and the input is not stored. This is server-side processing, so the file does leave your device temporarily.

1. Select Open and choose the image you want to optimize.
2. Wait for the server to process the file.
3. Compare Original size with New size to see whether space was saved.

The reported sizes tell you whether compression had a meaningful effect. They do not provide an objective image-quality score.

Which image format should I keep for the web?

Keep JPEG, commonly using the .jpg filename extension, for most photographs, PNG when lossless detail or transparency matters, GIF for simple animation, and WebP when modern web compression is the priority. Optimization and format conversion are related, but they are not the same operation.

If you specifically need a different format, PNG to JPEG is useful for turning a large photographic PNG into a broadly compatible lossy image. PNG to WebP is often a better fit for web graphics that need transparency with a smaller transfer size.

Reading the size result

Original size is the size of the selected file before processing, while New size is the size reported after optimization. When New size is smaller and both values are converted to the same unit, the difference between them is the number of bytes saved.

For example, suppose the displayed values are 2.4 MB and 780 KB. Using decimal units, 780 KB is 0.78 MB, so the difference is 1.62 MB. The reduction is about 67.5 percent, calculated as the difference divided by the original size.

No single reduction percentage applies to every image. A camera photo with generous quality settings may have substantial room for compression. A small JPEG that has already been compressed may change very little, while a PNG screenshot with repeated colors and simple shapes may compress more effectively than a detailed photographic PNG.

• Check thin text, gradients, shadows, and areas around sharp edges for artifacts.
• Remember that reducing byte size does not necessarily reduce pixel width or height.

Can optimization fix a blurry or heavily compressed image?

No, optimization cannot restore detail that was removed by earlier lossy compression, poor focus, or low resolution. Saving a damaged JPEG as lossless PNG may prevent further compression damage, but it does not recreate the missing image information.

Repeatedly opening and resaving a JPEG with lossy settings can introduce block patterns, ringing around edges, and color smearing. Conversion to a lossless format makes sense when you need transparency or lossless editing from that point forward, but it is not a repair method and may increase the file size.

Optimization may also be unnecessary for an already tiny interface icon or an image that must remain an exact archival copy. In those cases, the possible reduction may not justify changing the file.

Common input problems

An image can fail to process correctly when the file uses an unsupported format or variation, its data is incomplete, or the processing system relies on an extension that does not match the actual format. Do not assume every image type is supported.

• Renamed extensions: Changing photo.png to photo.jpg does not convert the underlying image data.
• Very large dimensions: If server resources are limited, a file can have moderate byte size but still require substantial memory when decoded because it contains millions of pixels.
• Empty or damaged files: A zero-byte file contains no image to optimize, and a partial download may be missing required headers or pixel data.
• Unusual filenames: Spaces, punctuation, accented letters, and non-Latin characters belong to the filename rather than the image format. Rename the file to a simple ASCII name if another system has trouble handling it.

Common questions about image optimization

Does image compression remove GPS location data?

It can, but metadata handling depends on the optimizer, and the size result alone does not prove that GPS data was removed. This tool's stated result fields do not report EXIF or location metadata. For a sensitive photo, remove location data deliberately before sharing it.

Why do some apps show KB while others show KiB?

KB commonly means 1,000 bytes, while KiB means 1,024 bytes. Some operating systems label a binary calculation as KB, so two displays can show slightly different numbers for the same file without the file having changed.

Will putting an optimized image in a ZIP file make it much smaller?

Usually not. JPEG, PNG, GIF, and WebP already use compression, leaving ZIP with relatively little repeated data to remove.

Can image compression hurt search visibility?

There is no known direct search penalty for compression itself. Smaller images can reduce transfer time, but visible artifacts, unreadable text, incorrect dimensions, or an unsupported format can make the page less useful. Review the actual page on both narrow and wide screens before publishing the image.

Can an optimized image still be too large for email?

Yes. Email systems may limit total attachment size, and encoding attachments can increase the amount of transmitted data. If a file remains too large, reduce its pixel dimensions, choose JPEG for a photograph, or share it through a file link instead of attaching it.