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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

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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

Markdown Viewer

Open and view any .md file as a clean, rendered document — drag, drop, read.

100% private Instant, in-browser
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Markdown Viewer that runs entirely in your browser

Open and view any .md file as a clean, rendered document — drag, drop, read. Everything happens locally on your device using JavaScript — your data is never uploaded to a server, which makes filemarkr a safe choice for sensitive or proprietary content.

Why use this tool?

It's fast, free, and requires no account or installation. Because the markdown viewer works client-side, there are no upload waits, no daily limits, and nothing leaves your browser tab.

Private by design

Unlike many online utilities that send your input to a backend, filemarkr processes everything in memory on your device. Close the tab and it's gone.

Frequently asked questions

Yes. Every tool on filemarkr is completely free with no account, sign-up, or usage limits.

Related tools

Text Diff Checker

Compare two blocks of text and highlight every difference line by line.

Case Converter

Convert text between camelCase, snake_case, kebab-case, Title Case and more.

Word & Character Counter

Count words, characters, sentences, lines and reading time as you type.

Slug Generator

Turn any title into a clean, URL-safe slug for pages and posts.