Verti-Horiz Text File Merger

An offline standalone web app to merge TXT files vertically or append them horizontally.
Made by Reactorcore @ https://reactorcore.itch.io/

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Vertical Stacking

What it does:

The Vertical Merger combines multiple text files into one, joining them one after another in alphabetical filename order.

How to use:

• Upload multiple text files by dragging them onto the upload area or clicking "Select Files"
• Files will be automatically sorted alphabetically by filename
• Each file's content will start on a new line
• Preview the result in the text area
• Copy to clipboard or download the merged file

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Horizontal Append

What it does:

The Horizontal Appender combines two text files line by line, merging corresponding lines from each file.

How to use:

• Upload a base file (left slot) and an addon file (right slot)
• Choose whether addon lines come before or after base lines
• Enable "Repeat addon lines" to loop addon content if it's shorter
• Enable "Remove extra spaces" to clean up formatting
• Preview the result and copy or download

Options:

• Addon after base: Places addon text after base text on each line
• Repeat addon: If addon has fewer lines, it loops from the beginning
• Remove extra spaces: Converts multiple spaces to single spaces

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This program is free, private and offline. All operations happen locally on your computer, simply using your browser, no data is sent anywhere – you can open the html file in Notepad++ or similar to see the source code directly.

Works via any modern web browser, so you can use it on any operating system. Win, Mac, Linux, Android, etc.

I originally made this so I can glue together my AI image generator prompts together (see my cool text generators on my itch.io page) for automation purposes and to avoid tedious manual work, but since this web app is so universally useful, I made it available to everyone for free.

Offline Edition:

Its $3, mostly as a way to support my work and to download an offline copy of the program incase you want to use it even if itch.io isn't online or you don't have internet.

Its identically the same as the online one you can use here.

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Support My Work

If my work is helping you, here's how you can support me too:

• Buy me an orange as a one-off gift:
  https://buymeacoffee.com/reactorcoregames
• Join as a Patreon member for tons of benefits:
  https://www.patreon.com/ReactorcoreGames
• Donate, buy, try my other itch.io releases:
  https://reactorcore.itch.io/
• Share my Linktree or Discord with people:
  http://www.reactorcoregames.com
  https://discord.gg/UdRavGhj47
• Hire me or recommend me for full-time work as a Game Designer or Prompt Engineer:
  reactorcoregames@gmail.com
  (I can do Advanced Game Design Plans/Consulting, Build Standalone Offline Web Apps or Automation Software With Python)

Enjoy! B-)
– Reactorcore