Markdown Editor

Online Markdown editor:
read and edit local .md files in your browser

An online Markdown editor is a good fit for this situation: you already have .md files on hand and want to open, read, lightly edit, and keep saving them as local Markdown files — all right in your browser.

NoteLoom is a Markdown editor that works the moment you open it in your browser. It is not an AI chat tool, and it is not a cloud notes app; it focuses on reading, editing, and saving your local .md files.

Open NoteLoom and read and write your .md files in the browser

Requires the desktop version of Chrome, Edge, or Arc; Firefox, Safari, and mobile are not supported yet.

What you need may not be "install yet another app"

If you just want to handle one or two Markdown files, the first step doesn't have to be installing a desktop app. You really only need to check three things:

What you want to do Plain text editor Online Markdown editor
Open a .md file Can open it, but only shows the source Can show the Markdown formatting
Edit the content Can change the text Can edit while seeing the structure
Save back locally Can save Great for saving back as .md

Notepad can open .md, but it won't render #, **, lists, and tables as formatted output. A Markdown editor's job is to let you switch freely between the source and the rendered reading view.

What this online editor, NoteLoom, can do

NoteLoom's current capabilities boil down to three steps:

  1. Open the app in your browser.
  2. Pick a local folder.
  3. Read, edit, and save the .md files inside it directly.

It supports three views:

View When to use it
source When you want to see the full Markdown source
live When you want to see the formatting as you edit
reading When you just want to read the document in peace

If your first encounter with Markdown came through ChatGPT, Claude, Kimi, or DeepSeek, these three views will be a lot easier than staring at the source alone.

How it works

To work with local Markdown files in NoteLoom, follow these steps:

  1. Open NoteLoom.
  2. Pick a local folder that contains .md files.
  3. Open the Markdown file you want to view in the file tree.
  4. Read it through first in reading mode.
  5. Switch to live (editing) or source when you need to make changes.
  6. Your edits are written back to the local file.

This flow suits beginners, because you don't have to understand all of Markdown's syntax first. You can read the document clearly first, then gradually get to know symbols like #, ##, -, and **text**.

Who it's for, and who it's not for

Situation Good fit?
AI gave you Markdown or a .md file and you want to see the formatting clearly Good fit
You want to read and write local .md files in your browser Good fit
You want to edit while seeing the formatting, and switch back to the raw symbols anytime Good fit
You want a tool that auto-summarizes, auto-writes, and chats with your notes Not a fit
You mainly write Markdown on a phone, in Safari, or in Firefox Not a fit

NoteLoom currently has no AI chat, AI summaries, or semantic search. It's more like a focused entry point for Markdown files: open the .md files you already have, read them clearly, fix them up, and keep them local.

3 traps beginners fall into

1. Mistaking Markdown for garbled text

Seeing #, **, or three backticks doesn't mean the file is broken. These are usually Markdown syntax. Switch to a Markdown editor and they'll show up as headings, bold text, lists, and code blocks.

2. Copying only into Notepad and thinking the formatting is lost

Notepad shows the Markdown source; it doesn't render the formatting. If you want to keep the structure, save it as a .md file and open it in a Markdown editor. If this text was copied from a tool like ChatGPT or Claude, see how to keep the Markdown formatting in AI answers.

3. Assuming an online editor must upload your files

NoteLoom's approach is that you pick a local folder and it reads and writes the .md files inside it directly. That's not the same as uploading documents to the cloud to edit them.

Related reading

Local-first Markdown editor The same NoteLoom, seen from the "files stay local, nothing goes to the cloud" angle. What is NoteLoom? A local-first Markdown editor: what it does and what it isn't, explained on one page. How do you open a .md file? Already have a .md file? Start with 3 ways to open it. How do you open the Markdown ChatGPT gives you? When the content comes from ChatGPT, how to save, read, and keep editing it. How do you write Markdown? Get to know #, **, and lists, and learn 8 basic syntax pieces by writing as you go. What is Markdown? Why AI so often uses this format to write answers and documents.

FAQ

What is an online Markdown editor?
An online Markdown editor is a Markdown editing tool you use inside your browser. It helps you read and edit .md files, without necessarily having to install a desktop app first.
Is NoteLoom an online md editor?
You can think of it as an online Markdown editor. More precisely, NoteLoom is a Markdown editor that reads and writes local .md files inside your browser.
Will NoteLoom upload my md files?
No. NoteLoom's core mechanism today is that you pick a local folder and it reads and writes the .md files inside it directly. It is not a cloud notes app, and it does not upload your notes to a NoteLoom server.
Does NoteLoom have AI features?
No. NoteLoom currently has no AI chat, AI summaries, automatic tagging, or semantic search.
I don't know Markdown syntax — can I still use it?
Yes. You can start in reading mode to read the formatted content, then switch to live (editing) or source when you need to make changes.
Can I use NoteLoom on my phone or in Safari?
Not at the moment. NoteLoom relies on the File System Access API, which is currently supported mainly by Chromium-based browsers like Chrome, Edge, and Arc; Firefox, Safari, and mobile browsers are not supported yet.

Open it and try it now

Drop your .md files into a local folder, then use NoteLoom in your browser to read one through, change a line, and save it back to the original file.

Open NoteLoom and read and write your first local .md file