Does the image compressor upload my photos to a server?

No. Compression runs entirely in your browser using JavaScript. Your images are never sent anywhere.

Which image formats are supported?

JPEG, PNG, and WebP. You can also choose a different output format from your source.

How much can it compress an image?

Typically 40–90% size reduction depending on the image and quality setting, with minimal visible difference at higher quality levels.

Image Compressor

Free online image compressor. Reduce file size of JPEG, PNG, and WebP images while maintaining visual quality, all processed locally in your browser.

Perfect for reducing image file sizes for web use, email attachments, or storage optimization while maintaining good visual quality.

How to use Image Compressor

Upload your image by dropping it or selecting from your device
Adjust compression quality using the slider (lower = smaller file)
Choose output format (auto, JPEG, PNG, or WebP)
Optionally preserve EXIF metadata
Click "Compress Image" to process
Compare before and after results
Download the compressed image

What compression actually does to your image

This tool re-encodes your image at a lower quality setting rather than resizing it. The quality slider runs from 0.1 to 1.0 and starts at 0.6, which is usually the point where file size drops sharply but visible artefacts have not appeared yet on photographs.

Compression here is lossy and one-way. Each pass discards detail permanently, so compressing an already-compressed JPEG a second time degrades it further rather than recovering anything. Always compress from your original file, not from a previous export.

Images larger than roughly 200KB are converted to JPEG automatically, because JPEG beats PNG substantially on photographic content. If you need a lossless result or transparency, pick PNG or WebP explicitly instead of leaving the format on auto.

Choosing a quality setting

For photographs headed to a website, 0.6 to 0.8 is the useful range. Below 0.5 you will start to see blocking around high-contrast edges and banding in skies and gradients.

Screenshots, line art, and anything containing text behave differently. JPEG compression smears text edges badly, so for those choose PNG or WebP and accept the larger file, or keep quality above 0.85.

Why this runs in your browser

Compression happens on your own machine using the browser Canvas API. The image is never uploaded, which matters if the photo contains a face, a document, a screenshot of private information, or location metadata.

A practical consequence: very large images are limited by your device memory rather than by an upload cap. On a phone, extremely large source files may fail where a desktop browser would succeed.

Questions

Does compressing remove EXIF and location data?: There is a preserve-EXIF option. When it is off, the re-encode drops the metadata block, including GPS coordinates and camera details. Turn it off if you are sharing a photo publicly and do not want to disclose where it was taken.
Can I get the original quality back afterwards?: No. Lossy compression discards image data permanently. Keep your original file if you may need a higher-quality version later.
Is there a file size limit?: There is no server-side limit because nothing is uploaded. The practical ceiling is your device memory and the browser tab, which is generally generous on desktop and tighter on mobile.