Jan's FolderSize v1.31

billon on 16 Mar 2017
  • 168KB (uncompressed)
  • Released on 12 Jun 2001
  • Suggested by Andrew Lee

FolderSize scans a selected drive or folder and reports the size of all the subfolders. The result can be viewed in bytes, percentage of total space or as a bar graph

System requirements: WinAll
Writes settings to: None
Stealth: ? Yes
License: Freeware
How to extract: Download the ZIP package and extract to a folder of your choice. Launch FolderSize.exe.

10 comments on Jan's FolderSize  The Portable Freeware Collection Latest Entries Feed

MIKLO 2017-04-03 14:59

@sarahwilliams25 I will be the judge of what is the "better" app,as I'm sure others are also capable of making the same choice for themselves thank you :)


__philippe 2017-03-16 19:14

Jan'sFolderSize v1.31 : Oldie but Goodie product !

Belatedly noted JFS scores 9/60 on Vir*sTotal, mildly concerning results most probably imputable
to JFS *.exe being packed with ASPack compressor, which many vir*s checkers tend to frown upon.

No matter, JFS has been running forever with aplomb and without any apparent side effect on my overly oldie XP machine...;-)


sarahwilliams25 2014-08-14 21:23

A better natively portable app can be found here:


Mike.S.G. 2011-05-13 11:50


I hope someone from TPFC is keeping track of some of the suggestions listed, this app has not been developed for ages, as far as I can tell the site has been abandoned due to the dev's passing in 2002, the site maybe 2006.

The site's forum link forwards to 'lulu's love shack' so I quickly closed the page.

Maybe TPFC could host a safe copy, if only to pay homage to Jan Horn.


webfork 2010-10-12 19:54

Certainly one of my favorite disk usage programs, but recently found that it won't let you click on a given file structure and open that in Explorer. Most other viewers have this option and its seems like a bit gap.

Corbo 2010-06-24 18:43

Database files, Exchange files, etc.

petra 2009-06-10 03:32

what possible file on earth could be bigger than 32 gb???

Scrith 2009-03-28 08:20

Yes, the version from the web site is v1.31, but be aware that this program does not handle files larger than 32GB. Had a directory containing 200GB of files, the largest being 37GB and this program reported that the directory contained only 11GB of files (and likewise the total size for the drive was wrong too). Would recommend this program instead: http://www.portablefreeware.com/?id=631

Rodders 2007-07-24 20:47

A great program that can match SpaceMonger (which writes to the registry, and available here).
Note that the version in the software is 1.3x instead of 1.4 as documented in the authors website.

Webfork 2007-07-04 13:10

Track down the big files or directories on your computer. Whenever you're running out of drive space, its always easiest to look at the biggest files and consider moving them to CD or DVD. System backups are also easier when you can see what is going where. I use this at least twice a month.

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