AllDup vs Fast Duplicate File Finder

AllDup9.0Visit Fast Duplicate File Finder7.5Visit

Higher score AllDup #1 in Duplicate File Finders 9.0/10 Free plan Free plan✓ 4 of 4 features Visit AllDup

vs

Fast Duplicate File Finder #10 in Duplicate File Finders 7.5/10 Free plan Free plan✓ 4 of 4 features Visit Fast Duplicate

• AllDup fits best

  Windows users wanting a fully free finder

• Fast Duplicate File Finder fits best

  Windows users scanning varied storage

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature	AllDup 9.0/10 Visit ↗	Fast Duplicate File Finder 7.5/10 Visit ↗
At a glance
Editor score	9.0	7.5
Ranking	#1 in Duplicate File Finders	#10 in Duplicate File Finders
Best for	Windows users wanting a fully free finder	Windows users scanning varied storage
Pricing model	Free	Free plan + paid
Starting price	Free plan	—
Free plan	✓	✓
Free trial	—	—
Deployment	Desktop	Desktop
Platforms	Windows	Windows
Features AllDup 4/4 · Fast Duplicate File Finder 4/4
File preview	✓	✓
Automatic selection	✓	✓
Recycle Bin / Trash	✓	✓
Folder exclusions	✓	✓
Specs
Platform coverage	Windows	Windows
Scan locations	local drives and storage media; network paths and shares; archive files including ZIP, RAR, and 7Z	Folders, computers, local drives, diskettes, CD/DVD-ROM, USB flash drives, external hard drives, NAS, network computers and drives
Match methods	file content; image similarity; sound similarity; filename; file size; modification or creation date; file attributes; hard links; video or sound duration	Byte-by-byte content comparison; similar files; file size; similar file names; same file size and name
Our review
Pros	Matches files by content, names, metadata, media similarity, and duration Scans local storage, network paths, and ZIP, RAR, and 7Z archives Previews results and automates selection before sending files to Recycle Bin	Scans local, external, NAS, and network storage Compares exact and similar files with internal previews Automates selection and supports several cleanup actions
Cons	Available only for Windows Does not include AI features Integrations focus on Windows media and document applications	Windows-only platform coverage Similar-file scans are limited in the free version Advanced export and command-line tools require Professional
Our verdict	AllDup is a free Windows utility for locating and managing duplicate files across local drives, storage media, network paths, and supported archive files. It suits Windows users who want broad control without a paid plan, including private… Read the review →	Fast Duplicate File Finder is Windows software for locating and removing duplicate files across folders, local drives, external storage, NAS devices, and network locations. It suits users who need more than a filename comparison, with… Read the review →

Strengths and trade-offs

• AllDup — where it wins

  • Matches files by content, names, metadata, media similarity, and duration
  • Scans local storage, network paths, and ZIP, RAR, and 7Z archives
  • Previews results and automates selection before sending files to Recycle Bin

  Where it doesn't

  • Available only for Windows
  • Does not include AI features
  • Integrations focus on Windows media and document applications

• Fast Duplicate File Finder — where it wins

  • Scans local, external, NAS, and network storage
  • Compares exact and similar files with internal previews
  • Automates selection and supports several cleanup actions

  Where it doesn't

  • Windows-only platform coverage
  • Similar-file scans are limited in the free version
  • Advanced export and command-line tools require Professional

• AllDup9.0/10 · Free plan

  A fully free Windows duplicate finder with broad matching and cleanup controls.

  Visit AllDupFull verdict →
• Fast Duplicate File Finder7.5/10 · Free plan

  A Windows duplicate finder with exact, similar, network, preview, and cleanup tools.

  Visit Fast DuplicateFull verdict →