Convert PNG to JPG or Convert JPG to PNG
Converting a PNG file to JPG is really easy in Mac OS X, here are the steps:
* Launch the origin PNG file within Preview
* Navigate to the File menu and down to ‘Save As’
* Select “JPG” under the ‘Format’ drop down list
* Click “OK”
Your PNG file now has been converted and saved as a JPG file to the location you specified! If you want you can go back and delete the origin PNG file. Naturally you could reverse the process and save a JPG file as a PNG file to do the opposite conversion.

Doesn’t work. No jpeg option presented in save as menu
using version 10.5.8
Works fine for me under 10.5.8, with Preview version 4.2. JPEG is the second file format option down after GIF.
What about Windows7 ? how can change JPG to PNG ??
Anyone have a clue how to “batch convert” .PNG to .JPG in Photoshop CS5 on a Mac Pro Dual? I have over 500 grabs (PNGs) for a project I must do that are taking up a ton of space and I can’t work with them as PNGs. JPEGs will be fine for my purposes. I know how to do batch conversions, do it all the time, but nothing’s happening when I try it with the PNGs. They just won’t convert in batch.
Do I have to do them one by one? You gotta be kidding me. Can’t find any help, forums or tutorials online. I can’t be the only one facing this challenge.
Please feel free to write me directly if anyone can help — TADesigns@aol.com
Thank you very much,
Ken
Thank you!! Worked awesome on my Mac with the instructions. I had tried searching the instructions on my computer before coming here.
Re: OS X Lion – use ‘export’ instead of ‘Save As’
I have “upgraded” to lion and have received some png attachments in an e-mail. My wife can read them with her iPad, but all the iMac can see is an icon. I have gone through the steps using “export” and it “does its thing” and appears to be converting it to a jpg, but the result is still the same icon, not a readable document.
i use colorsync utility