How to easily find big files in Windows 8/Mac OS X without third party software

I've been using my PC with Windows 8 and my Mac with OS X for a while. The available hard disk space is becoming less and less. So I need to find out which big files are consuming a lot of space (videos, installation packages) so that I can delete or move them. I prefer not installing any third party software. But if you do know any good third party cleanup tools, you may also let me know. Thanks!
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Whatsize is the standard Mac software for finding where your disk space has gone.

I am leery of cleanup tools and prefer to do that by hand.

If what you want to do is clean out cache and log files, though Onyx works well and is free.
condor888Author Commented:
Hi Ben, that's good article. So I'd like to find a similar solution on the mac without third party software.
@strung thanks for your software recommendation, but do you have a way without third party software to do the finding on the Mac?
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Scott CSenior EngineerCommented:
For Windows...WinDirStat Portable.

All you need is the executable on a flash drive and run it.  You get a 3rd party app but no install.
Here is a list of alternatives to WhatSize, some of which are free: but I don't think any work as well.
The best you can do without any third party software is to do a Spotlight search.

1. Open a Finder window

2. Type Command-F to open a search box in the finder window.

3.  Open the Kind pop-up menu, then choose Other.

4.  Under “Select a search attribute” select the checkbox for File Size.

5.  Change the “equals” pop-up menu to “is greater than,” then center a minimum file size.

Searching begins as soon as you type a file size. It may take a moment for all the search results to appear.

This has limitations as it won't show folders,  invisible or system files.  

Really, Whatsize is by far your best bet. There is a free downloadable demo.

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Ben HartCommented:
Crap sorry Condor.. I didn't see the Mac part.  Me not having one I'm of no use on that front.
condor888Author Commented:
@Ben it's okay, i can accept multiple solutions.
condor888Author Commented:
@strung the searching solution seems good. I am also curious about Whatsize. Is it a popular software under the Mac? Is it safe to install? Have you purchased that?

If I have several Macs, how many license should I purchase?
It is very popular. I have used it. It is perfectly safe.
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