Compress Image Online Free

Reduce image file size with an adjustable quality slider. Preview and download in one click.

Drop an image here

or

Your images never leave your browser

Our free image compressor helps you shrink JPG, PNG, and WebP files for web and email — privately in your browser, with no signup and no watermark.

How to Compress an Image

1

Upload image

Drop or select a JPG, PNG, or WebP file from your device.

2

Set quality

Use the slider to balance file size and visual quality, then compress.

3

Download

Compare before/after sizes and download your optimized image.

Frequently Asked Questions

How does image compression work here?

Your image is drawn onto a canvas in the browser and re-encoded with a quality setting you control. Nothing is uploaded to a server.

Will quality get worse?

Lower quality values create smaller files with more compression artifacts. Start around 70–85% for web photos and adjust until the preview looks good.

Is my image uploaded to Site95?

No. Compression is private by default and runs entirely in your browser. We never receive your file.

What formats are supported?

JPG, PNG, and WebP as input. You can export as JPEG, PNG, or WebP. JPEG and WebP use the quality slider most effectively.

Is there a file size limit?

For reliable browser processing we recommend staying under about 25 MB. Extremely large photos may fail on mobile devices with limited memory.

Can I compress screenshots for email?

Yes. Large PNG screenshots often shrink a lot when exported as JPEG or WebP at moderate quality.

How do I compress images for my website without losing quality?

Start around 70–85% quality and export as WebP or JPEG — that range keeps photos looking sharp while cutting file size significantly, which speeds up page load for visitors.

Free Image Compressor for Web & Email

Large photos slow down websites and bounce off email attachment limits. Site95's free compress image tool re-encodes your file in the browser so you can see the new size before you download. Nothing is uploaded to a remote server — quality and privacy stay under your control.

When to compress images

Compress camera originals before publishing a blog post. Shrink screenshots for support tickets. Reduce product photos for a shop catalog. Prepare attachments that must stay under corporate email caps. If a file is already tiny (for example a 30 KB icon), further compression may not help — focus on multi-megabyte photos first.

How browser compression works

Your image is drawn onto a canvas and exported with the quality and format you choose (JPEG, WebP, PNG, and more). JPEG and WebP respond best to the quality slider. PNG keeps sharp edges but often remains larger. Preview the result, compare before/after sizes, and download only when you are satisfied.

Tips for better results

  • Resize huge photos to the display size you need before heavy compression
  • Start near 70–85% quality for photos, then adjust
  • Prefer WebP for modern websites; JPEG for maximum compatibility
  • Keep a high-quality master offline; publish the optimized copy

Privacy

Site95 never receives your image for this tool. Processing uses the browser Canvas API on your device — the same privacy-first model as our PDF tools.

For more tips, read how to compress images for the web. Next, try resize image or convert image.