How to Reduce Image File Size for a Faster Website

A camera or phone captures photos at a resolution meant for printing or zooming in — often 3000px or more on the long edge. Almost no website ever displays an image that large. If you upload it straight to a blog post or product page without resizing or compressing it first, the visitor's browser downloads all of that unused resolution before the page can even finish loading.

Resize before you compress

Compression alone can only do so much if the image is still 4000px wide. Figure out roughly how large the image will actually display (a blog hero image rarely needs to be wider than 1600–2000px), and use our Resize Image tool to bring it down to that size first. This one step often shrinks the file more than compression settings alone would.

Then pick the right output format

Photos compress best as JPG or WebP; screenshots, logos, and anything with flat colors or text compress best as PNG. Using the wrong format for the content is one of the quietest ways a page ends up slow — see our PNG vs JPG vs WebP guide for the full breakdown, and use Convert Image Format to switch.

Compress to a target, not a guess

Rather than exporting at a vague "medium quality" setting, our Compress Image tool lets you set an actual target file size in KB. For most web images, aiming for somewhere under 150–250KB per image is a reasonable starting point — small enough to load fast, large enough to still look sharp at typical display sizes.

A quick pre-upload checklist

• Resize to roughly the display size first — not the camera's original resolution.
• Use JPG or WebP for photos, PNG only for graphics that need flat, sharp edges.
• Compress to a specific KB target rather than eyeballing a quality slider.
• Check the image at actual display size afterward, not just zoomed in.