I am trying to compress some files on my MacBook Air (2017), and when I "compress" the files, they are ending up larger!
For example, the original file was 19.6MB and the zip file is 20.1MB.
I'm confused and unsure why this is happening, but I need the files to be zipped to post them onto my Etsy page; the limit is 20MB files!
MacBook Air 13″, macOS 12.3
That's understandable, but why is the zip file larger?
On Etsy, I need the file to be 20MB or less and the original file is 19.6MB, but I need it to be a ZIP file for Etsy, which is coming out larger at 20.1MB?
Shouldn't it stay the same size?
Louise_Emma wrote:
That's understandable, but why is the zip file larger?
On Etsy, I need the file to be 20MB or less and the original file is 19.6MB, but I need it to be a ZIP file for Etsy, which is coming out larger at 20.1MB?
Shouldn't it stay the same size?
The zipping process is adding file retore and other information. If the file is already compressed and can not be reduced in size, the zipping process still needs to add the meta data to the original file thereby increasing the file size a bit.
It's a standard file with images in - not a zip file or anything like that
I've tried compressing the file with the images in and tried highlighting all the images and compressing them that way but having the same issue both ways!
Again, what is the file type? File types such as jpeg are already compressed.
Image file formats are standardized means of organizing and storing digital images. An image file format may store data in an uncompressed format, a compressed format (which may be lossless or lossy), or a vector format.
Louise_Emma wrote:
I'm using PNG files, I don't know if that makes a difference?
You can compress a PNG file by lowering the image quality. PNG’s use lossless compression, meaning compression doesn’t impact image quality.
PNG images are already compressed when they are created. However, if you are starting with a large PNG image, no amount of compression will make it smaller and you will have to alter the image dimensions to make it smaller in measured size.
.png is a compressed image file type.
You will need to reduce their resolution, for example export them as .jpg. They are also compressed but can be as "lossy" as you are willing to tolerate. There are plenty alternatives but I use Preview for that purpose.
Image files like .jpg are already quite compressed.
But if you compress a .txt file having only a large number of letter "a", then it will compress a lot.
What is the file type? Maybe you are trying to compress a file that is already compressed.
Oh, the actual images themselves? They are PNG files! Sorry!
I'm using PNG files, I don't know if that makes a difference?
Edited - redundant info.
Right, that makes sense! Thank you.
Compressed Files on Mac are larger than the original!
