ResizeIt allows you to change the size of multiple images simultaneously. It can also convert file formats at the same time. It supports multi core and processes multiple images very fast.

When the app is launched the file open dialog will be shown, so please choose photo files to be processed, then the app shows setting window. Dragging and dropping photo files can be accepted too. Then just input setting and hit Resize button and it's done.
The setting can be saved as preset.
If the aspect ratio have to be kept, just input 0 to height or width then ResizeIt automatically calculate the appropriate value and resize. For example input H:500 W:0, ResizeIt calculate width to keep aspect ratio.
Please refer to manual about other details. Manual can be shown by choose ResizeIt>Manual menu when setting window is shown.

If you like this software, I'd like to ask to make small donation to help effort for the Japan earthquake and tsunami disaster.

What’s New

Version 3.7.0

Support file tag function of MacOSX10.9.

Ratings and Reviews

1.7 out of 5
33 Ratings
33 Ratings
GrassValleyGal ,

Works great for me

I don’t know why this is getting such bad reviews, but maybe it’s improved greatly just recently (I’m writing this on Dec 1, 2018) and the old reviews are weighing down the rating. I love this little app — it’s the easiest, fastest way I’ve found to reduce the size of images. Works fine every time. Most of the photos I get off my iPhone are too large to send easily on email (usually I’m sending more than one) and this takes them down in a jiffy. So happy to have found it and will be giving a demo to our Mac club soon.

I REALLY dont hate you ,

Used to work great….now not so much.

I used to utilize this when processing pictures from my phone which usually come out around 3mb each. It worked flawlessly but I didn't have a need for it again until recently. Now it appears to allow you to select the files, set the transfomations and select the output folder, and then it does nothing. Output folder remains empty. Please update and fix, this app is invaluable to us in our daily processes. Its a small simple app but doesn't seem to want to work at all on OS 10.7.5. Is there a way to download the old version in the meantime? Hope so...

Mikeg1996 ,

Gets the job done.

I don’t understand the critical reviews. It does exactly as what it states. As for people complaining you can’t upsize, what would you need that for??


Nobuatsu Sekine
2.6 MB

OS X 10.6.6 or later, 64-bit processor


English, Japanese

Age Rating
Rated 4+
© Nobuatsu Sekine


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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