What developer tools does Texterfly offer?

Texterfly offers 10 free developer tools: a JSON Formatter & Validator, an All-in-One Data Converter (JSON/CSV/XML/YAML), a JWT Decoder & Analyzer, a Cron Job Generator & Explainer, a QR Code Generator, a Password Generator, a Unix Timestamp Converter, a Lorem Ipsum Generator, an Interactive Data Visualization Builder, and a CSS Neumorphism Generator. All are free, browser-based, and require no signup.

How do I format and validate JSON online?

Paste your JSON into the JSON Formatter & Validator tool. It automatically detects syntax errors with precise line and column numbers, beautifies the output with proper indentation, and offers a minify option to compress the JSON for production use. You can also upload a .json file or fetch JSON from a URL.

How do I convert JSON to CSV (or CSV to JSON)?

Use the All-in-One Data Converter & Formatter. Paste your JSON or CSV, select the output format, and the conversion happens instantly. The tool also supports XML and YAML conversion, file upload, URL fetching, and JSONPath queries for extracting specific fields before converting.

How do I decode a JWT token?

Paste your JWT into the JWT Decoder & Analyzer. The tool instantly splits it into the header, payload, and signature sections, decodes the base64url encoding, checks expiration (exp claim), and detects common security issues like the "none" algorithm attack. For HS256 tokens, you can enter a secret key to verify the signature.

How do I write a cron job expression?

A cron expression has five fields: minute (0-59), hour (0-23), day of month (1-31), month (1-12), and day of week (0-7). Examples: "0 9 * * 1" runs every Monday at 9 AM; "0 0 * * *" runs daily at midnight; "*/15 * * * *" runs every 15 minutes. Use the Cron Job Generator to build and validate expressions visually with a real-time English translation.

What makes a password strong?

A strong password has: at least 16 characters (longer is better), a mix of uppercase and lowercase letters, numbers, and symbols, no dictionary words or predictable patterns, and is unique (never reused across accounts). The Password Generator creates cryptographically random passwords meeting all these criteria and shows an entropy-based strength score.

What is a Unix timestamp?

A Unix timestamp is the number of seconds elapsed since January 1, 1970, 00:00:00 UTC (the Unix Epoch). It is the universal standard for representing time in computing. A 10-digit number is seconds; 13 digits is milliseconds; 16 digits is microseconds; 19 digits is nanoseconds. Use the Timestamp Converter to convert between Unix time and human-readable dates.

What is neumorphism in CSS?

Neumorphism (also called Soft UI) is a design style that uses a combination of two box shadows — one light and one dark — on a background that matches the element's color to create a soft, extruded or pressed appearance. The CSS Neumorphism Generator creates the exact box-shadow CSS code for any color, size, and depth with a live preview.

What is the structure of a JWT?

A JWT (JSON Web Token) consists of three base64url-encoded parts separated by dots: Header.Payload.Signature. The Header specifies the token type (JWT) and signing algorithm (e.g. HS256). The Payload contains claims — statements about the user or session like "sub" (subject), "exp" (expiration), "iat" (issued at), and "iss" (issuer). The Signature verifies that the token was not tampered with.

Are these developer tools free?

Yes. All 10 developer tools on Texterfly are 100% free with no registration, subscription, or payment required.

Is my code or data private?

Yes. All processing runs entirely in your browser using JavaScript. Your JSON, JWT tokens, passwords, and data are never sent to any server or stored anywhere. This makes the tools safe for sensitive tokens, credentials, and confidential data.

Can I use these tools for commercial projects?

Yes. All Texterfly developer tools are free for both personal and commercial use. There are no licensing restrictions on how you use the output.

Does this Markdown editor support GitHub Flavored Markdown (GFM)?

Yes. The editor fully supports GitHub Flavored Markdown including fenced code blocks, tables, task lists (- [ ] syntax), strikethrough (~~text~~), and autolinking of URLs.

Does the code block have syntax highlighting?

Yes. Fenced code blocks with a language identifier (e.g. ```javascript) are highlighted using highlight.js, which supports over 190 programming languages.

Is my Markdown saved automatically?

Yes. Your content is automatically saved to your browser's localStorage, so it persists if you refresh the page or close and reopen the tab. Nothing is stored on a server.

How do I convert Markdown to HTML?

Write your Markdown in the editor. The rendered HTML is generated in real time in the preview panel. Click 'Copy HTML' to copy the raw HTML to your clipboard, or 'Download HTML' to save it as an .html file.

Can I use this as a Markdown previewer for README files?

Yes — it is ideal for previewing GitHub README.md files. Paste the content and the preview renders GFM exactly as GitHub does, including tables, task lists, and code fences.

What Markdown shortcuts are available in the toolbar?

The toolbar provides one-click insertion for: Bold, Italic, Heading 1–3, Link, Inline Code, Code Block, Unordered List, Ordered List, Task List, Table, Image, Horizontal Rule, and Blockquote.

Is there a word count or reading time estimator?

Yes. The status bar below the editor shows the live word count, character count, line count, and estimated reading time (at 200 words per minute).

Can I use this Markdown editor offline?

The editor requires an internet connection on first load to fetch the rendering libraries (marked.js and highlight.js from a CDN). After the initial load, if you keep the tab open, it works without further network requests.

Back to Developer Tools

Markdown Editor & Live Preview

Write Markdown in the editor, see the rendered result instantly. Supports GFM, tables, code blocks, task lists, and HTML export.

EDITORLoading renderer…

# Welcome to the Markdown Editor

Write Markdown on the left, see the **live HTML preview** on the right.

---

## Text Formatting

You can write **bold**, *italic*, ~~strikethrough~~, and `inline code`.

> Blockquotes look great for pull-quotes and callouts.

---

## GitHub Flavored Markdown (GFM)

### Tables

| Feature           | Supported | Notes                        |
|-------------------|:---------:|------------------------------|
| GFM Tables        | ✅        | With alignment               |
| Task Lists        | ✅        | Interactive checkboxes        |
| Fenced Code       | ✅        | With syntax highlighting      |
| Strikethrough     | ✅        | `~~like this~~`              |
| Autolinking       | ✅        | https://texterfly.com         |

### Task List

- [x] Write Markdown
- [x] Preview it live
- [ ] Export to HTML
- [ ] Share with the world

---

## Code Blocks

JavaScript with syntax highlighting:

```javascript
function greet(name) {
  return `Hello, ${name}! Welcome to Texterfly.`;
}

console.log(greet('Developer'));
```

Python:

```python
def fibonacci(n):
    a, b = 0, 1
    for _ in range(n):
        yield a
        a, b = b, a + b

print(list(fibonacci(10)))
```

---

## Lists

**Unordered:**
- First item
- Second item
  - Nested item
  - Another nested item
- Third item

**Ordered:**
1. Plan it
2. Write it
3. Publish it

---

## Links & Images

[Visit Texterfly](https://texterfly.com) — free online tools for developers and writers.

![Alt text for an image](https://via.placeholder.com/400x200/0f111a/c3e88d?text=Image+Placeholder)

---

*Start editing above to see your changes rendered in real time →*

PREVIEWLight theme

Preview will appear here…

Texterfly Markdown Editor|0 words·0 chars·0 lines·~1 min read

Auto-saved to browser

Bold

**text**

Italic

*text*

Heading

# H1, ## H2

Link

[text](url)

Code

`code`

Task

- [x] done

Support Our Free Tools

If you find this calculator helpful, please consider supporting our work. Your contribution helps us build and maintain these free tools for everyone.

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Online Markdown Editor with Live Preview — GFM, Tables, Code Highlighting & HTML Export

Texterfly's Markdown Editor is a free, browser-based writing environment that renders your Markdown into styled HTML as you type. There is no login, no file upload, and nothing stored on a server — your content lives in your browser.

It supports the full GitHub Flavored Markdown (GFM) spec: fenced code blocks with syntax highlighting for 190+ languages, tables with column alignment, task-list checkboxes, strikethrough, and automatic URL linking. When you are done, export to a standalone .html file or copy the raw HTML to paste anywhere.

How to Use the Markdown Editor

Write or paste Markdown in the left panel. Use the toolbar to insert formatting — bold, italic, headings, links, tables, code blocks, and more — without remembering the exact syntax.
Watch the HTML render in real time on the right. Every keystroke updates the preview instantly. Code blocks are automatically syntax-highlighted.
Switch view modes. Use the toolbar icons to toggle between split view, editor-only (distraction-free writing), and preview-only (reading mode). Toggle the preview between light and dark themes.
Check your stats. The green status bar shows live word count, character count, line count, and estimated reading time. Your content is auto-saved to localStorage between sessions.
Export. Download a standalone .html file (with embedded CSS, ready to open in any browser), download the raw .md source, or copy either to your clipboard with one click.

Features

Markdown Support

GFM tables — pipe-syntax with left, center, right alignment.
Task lists — - [ ] and - [x] render as real checkboxes.
Fenced code blocks — annotate with a language, get syntax highlighting.
Strikethrough — ~~text~~ renders correctly.
Autolinking — bare URLs become clickable links.
Blockquotes, nested lists, HR — all CommonMark features.

Editor Features

Toolbar — 14 formatting shortcuts; inserts at cursor position.
Tab key — inserts 2-space indent instead of losing focus.
Auto-save — content persists in localStorage across page refreshes.
Split / Editor / Preview modes — adapt the layout to your workflow.
Dark & light preview themes — toggle without leaving the page.
Export HTML + MD — download or copy in one click.
Status bar — words, chars, lines, and reading time always visible.

GitHub Flavored Markdown (GFM) — Quick Reference

GFM extends standard CommonMark with features widely used on GitHub, GitLab, and most modern documentation systems. Here are the most commonly used GFM elements this editor supports:

GFM Tables

| Left | Center | Right | |------|:------:|------:| | A | B | C |

Task Lists

- [ ] Incomplete task - [x] Completed task

Fenced Code Blocks

```python def hello(): print("Hello, world!") ```

Strikethrough & Links

~~deleted text~~ [Link text](https://example.com) https://autolinking.com

Who Uses This Tool?

Developers

Preview README.md files, write GitHub issues in GFM, draft technical documentation, and test Markdown rendering across different specs before committing.

Technical Writers

Write docs-as-code in Markdown with a live preview. Export standalone HTML to share drafts with stakeholders who don't use a code editor.

Bloggers & Content Creators

Draft posts in Markdown and export the HTML to paste directly into WordPress, Ghost, or a CMS that accepts raw HTML blocks.

Students & Researchers

Write structured reports, README files, and notes in Markdown. The reading-time estimator helps gauge article length.

API / LLM Developers

Many LLMs return Markdown-formatted responses. Paste the output here to verify how it renders before piping it into a UI.

Casual Writers

Markdown is the fastest way to add structure to plain text. No toolbar clutter — just type and see the result instantly.

Frequently Asked Questions

Does this editor support GitHub Flavored Markdown?

Yes — fully. GFM tables, task lists, strikethrough, fenced code with language identifiers, and autolinking are all supported out of the box.

How do I get syntax highlighting in code blocks?

Add a language identifier after the opening fence: ```javascript, ```python, ```bash, etc. The editor uses highlight.js, which covers 190+ languages.

Is my content saved if I close the browser?

Yes. Your Markdown is auto-saved to your browser's localStorage after every change. Reopen the page and your content is restored. Nothing is sent to a server.

Can I use this to preview README files?

Absolutely. Paste the contents of any README.md and the preview renders it exactly as GitHub would — tables, task lists, badges, and all.

What does the HTML export look like?

The downloaded .html file is a complete, standalone document with embedded CSS — it opens and looks correct in any browser without any external dependencies.

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