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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 →

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

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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

Color Converter

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

100% private Instant, in-browser Read the guide
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Color Converter

CSS, design tools, and image libraries all speak different color dialects, and manually translating a shade from HEX to RGB or HSL wastes time and invites typos. This color converter takes a color in HEX, RGB, HSL, or HSV and instantly shows its equivalent in the other formats, with a live swatch so you can confirm you've got exactly the shade you meant.

How it works

Everything runs locally in your browser. Enter a color in any supported format and the tool parses it and recalculates the other representations on your machine, updating the preview and every field as you go. There's no server round-trip, so conversions are instant, and the page keeps working offline once it has loaded.

Common use cases

  • Convert a designer's HEX value into rgba() for CSS opacity.
  • Move between HSL and HEX while tweaking a palette.
  • Match a color from a mockup to code exactly.
  • Understand how HSV maps to the values in your tools.

Pair it with the Color Picker & Palette to build a scheme, generate backgrounds with the CSS Gradient Generator, or verify accessibility with the Color Contrast Checker.

Private by design

Your colors never leave the browser — no upload, no sign-up, no tracking. The converter is free and works on every modern browser, including mobile, so you can translate and preview colors instantly wherever you're working.

Frequently asked questions

It converts between HEX, RGB, HSL, and HSV, updating every format and the live preview at once.

Related tools

Number Base Converter

Convert numbers between binary, octal, decimal and hexadecimal.

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.

HTML to Markdown

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