Image compression guides

Choosing the wrong format can make a file five times larger than it needs to be.

Short on time? Here is the fastest route.

Good file names help you, your team and search engines.

The honest answer is: more than you think.

Colours that look vivid on your camera can look dull after upload if profiles are mishandled.

Yes, but how much depends on your settings.

Mac users can compress JPEGs without opening Preview or Photoshop.

Resizing is the single biggest lever for file size.

Getting a JPEG ready for email newsletters is mostly about two numbers: pixel width and file size.

Many online compressors upload your images to a server. That is not always necessary.

The honest answer is: more than you think.

Speed is the most visible benefit of compression.

Yes, but how much depends on your settings.

Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.

Resizing is the single biggest lever for file size.

There is no single magic number, but there is a sensible range for blog post images.

Size limits are written in kilobytes and megabytes, and the units trip people up.

Image compression comes in two flavours.

You do not need paid software to compress images well.

Blurriness after compression usually comes from resizing too far, not from JPEG itself.

Strictly speaking, JPEG compression always discards something, but you can make the loss invisible.

A few habits cause most of the blurry or oversized images we see.

There is no single magic number, but there is a sensible range for insurance claims.

Size limits are written in kilobytes and megabytes, and the units trip people up.