Markdown Viewer

• The text is rendered on your device. The Markdown converter (marked) and the HTML cleaner (DOMPurify) are downloaded from this site and run in your browser. Nothing is loaded from other sites.
• The tools load after the page. They start downloading once the page has loaded, before you paste anything. If you paste while they are still downloading, you see “Loading the renderer…” and the result appears as soon as they are ready.
• HTML in your text is cleaned. <script>, event attributes such as onclick, <iframe>, style attributes and javascript: links are removed. This stops pasted text from breaking the page or quietly sending requests.
• Links open in a new tab. Only http, https and mailto addresses become links. They open in a new tab without giving that page access to this one (rel="noopener noreferrer"). Any other address stays plain text.
• Text over 100 KB is not redrawn automatically. When you edit it, the old result stays dimmed until you press Redraw. This keeps the page responsive while you type in a long document.
• Up to 1 MB. Longer text is not rendered, and you see “You can paste up to 1 MB” instead. Your text stays in the box.
• Nothing is saved. Your text is not stored on your device or put in the address bar. There is no share link. If your text is still there after you reload the page, your browser restored the text box.
• A single line break does not start a new line. As on GitHub, an empty line separates paragraphs. Lines with only a line break between them join into one paragraph.

Why external images are not loaded right away

![description](https://...) in Markdown means “show the image at this address here”. To show it, your browser has to ask the server at that address for the image. At that moment, the server learns your IP address (which can reveal roughly where you are), your browser type and the time. A value at the end of the image address, such as ?id=..., can also tell it which document you opened.

This matters when you paste text someone else wrote. A tiny, invisible image hidden in the text can report to its owner that you opened it. Email newsletters use this “tracking pixel” all the time.

So this tool does not load images whose address starts with http://, https:// or // at first. In their place it shows a gray box with the alt text and the name of the server the image is on, for example “toolbox24.net”. At the top of the result, a notice says how many external images were not loaded, with a Load external images button. If you trust the text, press it to see the images.

• Pressing it loads the external images that are there now and any you add to the text afterwards.
• The permission lasts until you leave the page, reload it or press Clear. It is not saved. If you press Undo after Clear, your text comes back but the permission does not, and images are blocked again.
• An image that fails to load shows a “Couldn’t load the image” box instead of a broken image icon.
• Images embedded in the text as data (data:image/...) have no outside server, so they show right away. Images with a relative address (img/a.png) point to a file outside this text, so they show “This image is outside this text and can’t be shown”.

Copying formatted text into email and documents

Copy formatted text puts the result on your clipboard with its formatting. Paste it into an email or a document editor such as Gmail, Outlook, Google Docs or Word, and headings stay headings, bold stays bold and tables stay tables, without the Markdown symbols. Apps that do not accept formatting get the plain text without symbols.

Copy HTML copies the cleaned HTML code. Use it where you paste code, such as the HTML view of a blog editor or a web page.

Both buttons work before you allow external images. In that case, external images are copied with their original addresses. This page did not load them, but the app you paste into may.

Printing and saving as PDF

Print opens your browser’s print dialog and prints only the formatted text. The site header, the text box, ads and this article are left out. If you have not allowed external images, gray boxes are printed in their place.

To save a PDF, choose “Save as PDF” (Chrome, Edge and other Chromium browsers) or “PDF” in the print dialog (Safari on a Mac) as the printer. This is a browser feature, so the name can differ by browser.

Press Insert example to fill in this text:

# Meeting notes

**Date**: 2026-11-11 · *Attendees*: 3 · ~~Cancelled item~~

## Decisions
- [x] Scope of the next release
- [ ] Launch date

## Numbers
| Metric | Last month | This month |
|---|---:|---:|
| Visits | 1,200 | 1,450 |
| Questions | 12 | 9 |

> Please share your materials before the next meeting.

1. First
2. Second

`Inline code` and a code block:

```js
console.log('Hello');
```

[toolbox home](https://toolbox24.net/en/)

![toolbox share image](https://toolbox24.net/og.png)

The result shows “Meeting notes” as the largest heading, “Date” in bold and “Attendees” in italic, a struck-through item, one checked box and one empty box, a table with the numbers aligned right, a quote, a numbered list and a code block in a monospaced font. The image at the end is on this site, but its address is external, so at first it shows as a gray box labeled “toolbox share image”. Press Load external images and the image appears.

• Lines join into one. As described above, you need an empty line to start a new paragraph. To break a line without starting a paragraph, end it with two spaces or a \.
• HTML tags disappear. Tags that can call outside addresses or change the page, such as <style>, <iframe>, <video> and <form>, and style attributes are removed. Text that shows them on GitHub may not show them here.
• A link is plain text. Links that start with javascript: or data:, and links within the page (#…), stay as text you cannot click.
• An image does not appear. If its address starts with http or https, press Load external images. If it still does not appear, the image server blocked the request or the address is wrong. Images with a relative address cannot be shown in this tool.
• Very long text. Above 100 KB, the result is drawn only when you press Redraw. Above 1 MB, nothing is drawn until you shorten the text.
• Offline. If the renderer has not loaded yet, press Try again. Once it has loaded, rendering works without an internet connection.
• Small differences from GitHub. This tool supports GitHub-style tables, task lists, strikethrough and automatic links. It does not support GitHub’s @mentions, issue number links, math or syntax highlighting.

Is my Markdown sent to a server?

No. The text is formatted in your browser and not saved anywhere. Nothing is left after you close the page. If you load external images, though, the servers those images are on learn your connection details.

Is it safe to paste Markdown someone sent me?

Scripts and tags that send hidden requests are removed, and external images are not loaded until you press the button, so simply opening the text does not tell the sender you read it. Clicking a link is still your choice, so be careful with addresses you do not recognize.

Copy formatted text does not work.

If your browser blocks clipboard access, you see “Couldn’t copy”. Check the site permissions next to the address bar, or try Copy HTML.

Can I download a PDF directly?

There is no download button. Use Print and choose to save as PDF in the print dialog. Only the formatted text is printed, so you get the same result.

Does it draw Mermaid diagrams?

No. ```mermaid blocks are shown as code here. To see Mermaid code as a diagram, use the Mermaid Viewer.