Map Making Online

Dungeon Fog https://www.dungeonfog.com/ vector based map maker (free & premium) shareable maps & export for Roll20
  • good graphics
  • online editor available
  • editor not very intuitive, help guide (I never found out how to erase a wrongly drawn square)
  • saves to the cloud
  • GM Notes per room/section
  • quite pricy
  • print & export maps

Dave’s Mapper
https://davesmapper.com/
random dunegon generator that uses drawn tiles of many different styles provided by users

  • mediocre graphics
  • premade sections don’t allow individual dungeons
  • exports to image

AnaMap
https://deepnight.net/tools/rpg-map/
RPG Map II is a “tabletop RPG” oriented map maker, created with the “keep it clean & simple” philosophy in mind..

  • download or online
  • snap-to-grid drawing (areas and single squares)
  • many adaptions possible
  • icons and text
  • Hint: draw walls, then ground texture
  • can’t paint thin walls, walls always fill a square

Dungeon Painter Online
http://pyromancers.com/dungeon-painter-online/

  • requires Adobe Flash, I am too lazy to activate this obsolete software

Tiamat The Tile Mapper
http://www.rpgobjects.com/index.php?c=tiamat

  • online tool
  • uses a collection of premade tiles you can position on an empty grid
  • not detailed/individual enough to create your own dungeons

Donjon
http://donjon.bin.sh/
both Dungeon map and general stuff generator (encounters, towns, calendars, NPC, traps, treasures…)

  • random dungeon generator
  • offers many pre-settings (dungeon size, style, etc.)
  • creates old-style D&D dungeons
  • also generates encounters, objects, positions for keys, traps, and more
  • export as PNG (legend as HTML)
  • playing with settings creates quite reasonable maps
  • not suited for drawing own layouts

DunGen
https://dungen.app/dungen/
free and high resolution Dungeon Generator, creates maps at 70px per tile and under 5mb to import directly into Roll20.

  • random dungeon generator
  • only basic settings
  • creates old-style D&D dungeons (not very realistic ones)
  • no icons for doors, etc.
  • export as JPG
  • not suited for drawing own layouts

Mipui
https://www.mipui.net/app/
simple and fast grid-based mapper

  • online grid editor
  • allows thin walls
  • lots of icons (but no locked door symbol?)
  • autonumber rooms
  • exports as JPG
  • very easy to use, fast editing