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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
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  • JSON to YAML

Encode & Decode

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  • Base64 to Image
  • Image to Base64
  • URL Encode / Decode
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Text Tools

  • Text Diff Checker
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  • Remove Duplicate Lines
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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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  • 100% in your browser
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© 2026 filemarkr. Designed & developed by Naved Naik.  All processing happens locally in your browser.

All tools

Color Picker & Palette

Pick a color, get every format, and generate tints, shades and palettes.

100% private Instant, in-browser Read the guide
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Color Picker & Palette

The color picker lets you choose a color and instantly get it in every common format, then generates matching tints, shades, and palettes around it. Pick visually or type in a value, and the tool shows you HEX, RGB, and HSL representations side by side. It is a quick way to lock in a base color and explore the variations you need for backgrounds, borders, hover states, and full palettes.

How it works

The picker runs entirely in your browser. When you select or enter a color, it converts the value into each supported format and mathematically derives lighter tints and darker shades, plus a coordinated palette, all on your device. Every value copies with one click. Because there is no server involved, results are instant, the tool works offline after loading, and it runs the same on desktop and mobile.

How to use it

  • Pick a color with the picker or paste a HEX, RGB, or HSL value.
  • Read the color in every format at once.
  • Browse the generated tints, shades, and palette.
  • Copy any value straight into your CSS or design tool.

Working with color? Convert formats with the Color Converter, verify legibility with the Color Contrast Checker, or blend colors in the CSS Gradient Generator.

Private by design

Your colors and palettes stay in your browser and are never uploaded. The tool is free, needs no account, and runs entirely client-side.

Frequently asked questions

It displays your chosen color in HEX, RGB, and HSL at the same time, and each format can be copied with a single click.

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Generate SEO, Open Graph and Twitter meta tags from a simple form.