Image compression guides

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

Image compression comes in two flavours.

Speed is the most visible benefit of compression.

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 PDF documents.

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

Text inside photos, like signs or slides, needs a gentler touch.

You do not need paid software to compress images well.

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

When you have dozens of images, consistency matters as much as size.

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

Quality is the slider people touch first, yet it is often the least understood.

Aspect ratio is the shape of the image, and the wrong one leads to awkward crops.

Text inside photos, like signs or slides, needs a gentler touch.

Screenshots behave differently from photos.

Photos carry hidden metadata such as camera model, date and sometimes GPS location.

If an upload keeps failing, the image is usually larger than it needs to be in more ways than one.

You do not need an app to shrink photos on an iPhone.

Quality is the slider people touch first, yet it is often the least understood.

iPhones save photos as HEIC by default, and not every site accepts it.

Faces are where viewers notice compression first.

Screenshots behave differently from photos.