Image Compressor Online Free — Reduce Image File Size

Why Compress Images?

Large image files slow down web pages, fill up email inboxes, and eat through storage on phones and servers. A raw photograph from a modern phone can easily be 5–10 MB. The same image compressed to 80% quality in WebP or JPG format is typically under 500 KB with no visible difference at normal viewing sizes.

For websites, image size is one of the biggest contributors to slow load times. Google PageSpeed and Core Web Vitals both penalise pages with unoptimised images. For personal use, compressed images upload faster to social platforms, attach more easily to emails, and take up less storage.

How to Compress an Image

1. Open the Image Compressor.
2. Click Choose File or drag your image onto the upload zone.
3. Adjust the Quality slider (1–100). Lower = smaller file, more compression.
4. Optionally set a maximum Width or Height to resize as well as compress.
5. The preview updates live — check the estimated file size and visual quality.
6. Click Download when you are satisfied.

Quality Settings Reference

Compression Tips

Start at quality 80 for photos

For most photographs shared on the web or via email, a quality setting of 80 produces output that is visually indistinguishable from the original at typical display sizes. Check the live preview at 100% zoom if you are not sure — compression artefacts appear first in areas with smooth gradients, like blue skies or skin tones.

Resize before sharing on social media

Social platforms resize images anyway, but uploading an oversized image first wastes bandwidth and processing time. Most platforms display images at 1200 px wide or less. Setting a max width of 1200 px in the compressor and using quality 80 gives a file that will look identical on screen to the uncompressed original.

Compress logos and graphics at higher quality

Logos, diagrams, and screenshots with sharp text or hard edges show compression artefacts more readily than photos. Use quality 90+ for these, or consider converting to PNG (lossless) using the Image Converter if the file size difference is acceptable.

Check the savings before downloading

The live preview shows the compressed file size alongside the original. If the saving is less than 20% at your chosen quality, try lowering the quality slider or switching to a more efficient format such as WebP.

Privacy: Your Images Never Leave Your Device

All compression happens in your browser using the Canvas API. Your image is read into memory, compressed, and offered for download — it is never sent to a server. This makes the tool safe for personal photos, confidential documents scanned as images, or any image you would prefer not to share with a third-party service.