How can I compress an image without losing quality?

Use ZaxisMedia's free Image Compressor: upload a JPG, PNG, or WebP image to reduce its file size online with no visible quality loss. Download instantly, no signup required.

How much can I compress an image without losing quality?

For photos saved as JPEG, a quality setting of 75–85% typically reduces file size by 60–80% with no visible difference on screen. Start at 80% and move the slider until you notice any change, then step back up a little.

Are my images uploaded to a server?

No. Everything happens on your device: the page loads once, then the compression runs locally with no uploads. That keeps your photos private and lets the tool keep working even if your connection drops.

Which formats can I compress?

You can upload JPEG, PNG, WebP, GIF and BMP images. Output is available as JPEG, PNG or WebP. PNG output is lossless (the quality slider only affects JPEG and WebP).

Will compressing an image make it smaller in dimensions?

No. Compression only reduces the file size, not the pixel dimensions. Your 1920×1080 image stays 1920×1080. To change dimensions, use the Image Resizer tool.

Why is my PNG still large after compression?

PNG is a lossless format, so the quality slider does not apply to it. For a much smaller file, choose JPEG or WebP as the output format, or convert with the PNG to JPG tool.

IMAGE TOOLS · FREE ONLINE TOOL

Image Compressor

Shrink image file size without visible quality lossOversized images are the single biggest cause of slow websites. A blog post with five unoptimized photos can weigh 15 MB. Upload one image or a whole batch, move the quality slider, and watch the file shrink with live numbers.

✓ Free to use✓ No sign-up✓ Ready in your browser

↗ Get started instantly

// IMAGE COMPRESSOR · GET STARTED

Compress your image

Shrink image file size without visible quality loss

⤒Upload images

Choose one image or many at once.

Drag images here or choose files

Choose Files

JPG, PNG, WebP, GIF or BMP. Processed privately in your browser.

Quality: 80%

Higher quality keeps more detail. Recommended: 70–90%.

Output format

// IMAGE COMPRESSOR · AT A GLANCE

Image Compressor: what to know first.

Shrink image file size without visible quality loss

Free in-browser compression for JPG, PNG and WebP, with a quality slider and live before-and-after file sizes.

No uploads, no queues, no watermarks and no sign-up - your images stay private.

// IMAGE COMPRESSOR · HOW IT WORKS

How to use the Image Compressor

Upload an image

Upload an image (JPEG, PNG, WebP, GIF or BMP).

Adjust settings

Move the quality slider to balance file size and visual quality.

Choose output format

Choose the output format (JPEG, PNG or WebP). The quality slider does not apply to PNG. Choose JPEG or WebP for smaller files.

Preview and download

Preview the result, check the size savings, then download.

// IMAGE COMPRESSOR · ABOUT THIS TOOL

About the Image Compressor

Large images are the number one cause of slow websites, hurting page speed, SEO rankings and mobile data usage. Check your page images to find more speed wins. This compressor shrinks your images right in the browser with an adjustable quality slider, live before/after sizes, and JPEG, PNG and WebP conversion in the same step. If you need different dimensions too, resize first and then compress for the best balance of size and quality.

Because processing is local, there are no server file-size limits, no queues, no watermarks and complete privacy for your images. Once your images are compressed, check your page images with a free SEO audit to catch any remaining oversized files.

Where it helps most

The highest-leverage speed fix.

Faster websites

Page speed studies keep landing on the same finding: oversized images are the biggest cause of slow sites. Compression is the highest-leverage fix there is.

Client galleries

Photographers batch-compress client galleries before delivery to speed up sharing and storage.

Product photos

Store owners slim down product photos before uploading to Shopify or WooCommerce. Smaller files mean faster product pages and happier mobile shoppers.

Blog routines

Bloggers run every featured image through it as a matter of routine.

Compressing wisely

Settings that actually matter.

The 80 percent default

The slider defaults to 80, honest guidance: JPEG photos at 75 to 85 percent typically shrink 60 to 80 percent with no visible difference.

Switch formats too

Saving a photo as JPEG or WebP instead of PNG often cuts more than any slider setting, since the quality slider does not apply to PNG. If you end up with a PNG still too large for fast pages, converting it to JPG usually fixes that.

Dimensions untouched

Pixel dimensions stay untouched: a 1920 by 1080 photo remains 1920 by 1080 after compression. Only the file size changes, never the shape.

Image Compressor: private by design

No server-side file limit, no queue, no watermark. All on your own device.

// IMAGE COMPRESSOR · COMMON QUESTIONS

Image Compressor FAQs

How much can I shrink an image without visible quality loss?

For JPEG photos, a quality setting of 75 to 85 percent usually cuts file size by 60 to 80 percent with no visible difference. Start at 80, lower the slider until you notice any change, then step back up slightly.

Why did my PNG barely get smaller?

Does compression change the image dimensions?

Are my images sent to a server?

Which output format should I choose?

Can I compress an image to exactly 50KB?

tools-guide

How to Compress Images Online: Reduce File Size Without Losing Quality

Cut JPG, PNG and WebP file sizes by up to 80% with no visible quality loss. Here is how image compression works and how to do it free in your browser.

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