filemarkr
All ToolsGuides
filemarkr

60+ free developer tools that run entirely in your browser — JSON formatter, JWT decoder, Base64, diff checker, regex tester, hash generator and more. No upload, no sign-up, completely private.

JSON & Data

  • JSON Formatter
  • JSON Minifier
  • JSON Validator
  • JSON to CSV
  • CSV to JSON
  • JSON to YAML

Encode & Decode

  • Base64 Encode / Decode
  • Base64 to Image
  • Image to Base64
  • URL Encode / Decode
  • HTML Entity Encoder
  • JWT Decoder

Text Tools

  • Text Diff Checker
  • Case Converter
  • Word & Character Counter
  • Slug Generator
  • Remove Duplicate Lines
  • Sort Text Lines

Generators

  • UUID Generator
  • Password Generator
  • Lorem Ipsum Generator
  • QR Code Generator
  • Random Number Generator
  • NanoID Generator

Popular Guides

  • How to Format and Pretty-Print JSON (Without Breaking It)
  • How to Minify JSON and Shrink Your API Payloads
  • How to Validate JSON and Pinpoint the Exact Syntax Error
  • How to Convert JSON to CSV for Excel and Google Sheets
  • How to Convert CSV to JSON (With Proper Header Detection)
  • All guides →

Explore

  • All Tools
  • JSON Formatter
  • JWT Decoder
  • Diff Checker
  • UUID Generator

Company

  • About
  • Privacy
  • Terms
  • Sitemap

Our Promise

  • 100% in your browser
  • Zero uploads
  • No sign-up, always free

© 2026 filemarkr. Designed & developed by Naved Naik.  All processing happens locally in your browser.

All tools

HTML to Markdown

Convert HTML into tidy Markdown for docs, notes and issues.

100% private Instant, in-browser Read the guide
Loading the tool…

HTML to Markdown Converter

Migrating content out of a CMS, a web page, or an email into a Markdown-based system means stripping tags by hand — tedious and easy to get wrong. This HTML to Markdown converter takes raw HTML and produces tidy, readable Markdown, preserving headings, links, lists, and emphasis so your content is ready for docs, notes, and issues.

How it works

The conversion runs locally in your browser. Paste your HTML and the tool parses the structure on your machine, mapping each element to its Markdown equivalent and dropping presentational markup that doesn't translate. Because it's pure client-side JavaScript, nothing is uploaded and the Markdown appears as soon as you paste.

Common use cases

  • Convert an exported web page into Markdown for a docs site.
  • Move formatted email content into a Markdown editor.
  • Turn legacy CMS HTML into portable Markdown files.
  • Clean up pasted rich text into simple Markdown.

Reverse the process any time with Markdown to HTML. Tidy messy source first with the HTML Beautifier, then refine the result in the Markdown Editor & Preview.

Private by design

Your HTML stays entirely in the browser — no upload, no account, no logging. The converter is free and works on any modern browser, including mobile, so you can migrate content without sending it to a server.

Frequently asked questions

No. The conversion runs locally in your browser, so your HTML never leaves your device.

Related tools

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

Color Converter

Convert colors between HEX, RGB, HSL and HSV with a live preview.

CSV to Markdown Table

Paste CSV and get a GitHub-flavored Markdown table you can drop into any README.

Markdown to HTML

Render Markdown to clean, sanitized HTML with a live preview.