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For companies

RGB to LAB

Convert RGB to LAB for free: type three numbers from 0 to 255 and get the CIE Lab value with two decimals. rgb(220, 38, 38) becomes lab(48.8% 67.7 48.8). Lab is built so that equal steps look roughly equal to the eye, which is why color difference formulas and print specs use it. Everything runs in your browser.

How to convert RGB to LAB

  1. 1Type R, G and B into "Color", such as 220 38 38
  2. 2Commas, rgb() or percentages work as well
  3. 3Click "Copy" next to the Lab value in the big line
  4. The color as lab(L a b), with L in percent

Good reasons to use it

  • Three numbers are enough.On this page 220 38 38 is read as red, green and blue, no rgb() needed
  • LCH comes along.The list also shows lightness, chroma and hue as LCH, next to OKLab and OKLCH
  • Nothing is sent anywhere.The conversion is a short calculation in your browser

What you can do

  • Turn RGB from 0 to 255 into CIE Lab, written the CSS way as lab() with L in percent
  • Type rgb() with percentages too, such as rgb(100%, 50%, 0%), or paste a hex code or a CSS name
  • Choose a color with the color picker: the field writes it as rgb(), the Lab value follows
  • Read XYZ in three forms (D65, D50 and 0 to 100) for work that starts from XYZ

Good to know

  • The tool takes RGB as sRGB, the color space of the web. RGB values from another space, such as Adobe RGB, give a different Lab color there
  • Lab is calculated with the D50 white, as CSS does. Tools that use D65 Lab arrive at slightly different numbers
  • Each channel must lie between 0 and 255. A value outside that range gives a message instead of a color
  • A transparency value, as in rgb(220 38 38 / 50%), is read but left out

Questions

How do I convert RGB to Lab?

Type the three RGB numbers into the field, for example 34 197 94. The big line shows lab(70.22% -57.98 39.44). Click "Copy" to use it.

Why use Lab instead of RGB?

In RGB the same step can look large in one color and tiny in another. Lab is built to follow the eye more closely, so it is used to compare colors and to describe them for print.

Why is L given in percent?

That is how CSS writes lab(). L runs from 0 to 100, so 48.8% simply means L = 48.8.

Is my color sent anywhere?

No. The tool calculates in your browser, and no request is made with your color.

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How it works

Small tools that run in your browser.

What runs where

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A tool your browser has kept also works without internet. Under Offline, at the bottom of this page, you can save everything at once, and the site keeps working without a connection.

Some tools have AI built in, for example to remove a background or enlarge a photo. Your browser downloads their AI models once, from ToolRecipe itself, and then runs them on your device. No tool sends your files to an online AI service or to us.

On a computer, these tools use the graphics chip when it passes a short check, because that is usually faster. On a phone they run on the processor, with settings that fit in a phone’s memory.

Using a tool

Give the tool your file, choose what you want, save the result.

  • Start on the home page

    Drop a file in the box on the home page, or try a sample photo. Pick what you want to do and press “Open tool”. The tool opens with your file in it.

  • Put a file in

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  • Choose the settings

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  • Save the result

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  • Results

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Chaining tools

What one tool makes can go straight into the next, without saving it and opening it again.

  • “Use it in”

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  • Drag it

    You can also drag a result onto an open tool. On a phone, touch and hold it first.

  • From a chain to a recipe

    To run the same tools again later, make a recipe of them in the recipe builder.

The recipe builder

Drop a file in the box on the home page and add the steps one at a time. Nothing runs until you press “Run recipe” or “Open tool”.

  • Pick what to do

    The box shows a tile for each kind of job your file allows, such as “Make it smaller”. A tile opens its ready-made choices and every tool of that kind. “Back” returns to the tiles.

  • Add steps

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  • Name it

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  • Run it

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  • Steps that need you

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  • Save or start over

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Recipes

A recipe is a few tools in a row: what one step makes goes into the next.

  • Ready-made recipes

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  • Make your own

    Build one in the box on the home page. On My recipes, “New recipe” opens the same builder at the top of the page, with a search box for the tool you need next.

  • My recipes

    Your saved recipes are under “My recipes” in the menu, in this browser. Open one to rename it or change its steps. Changes are saved at once. “Start with a file” runs it on a new file. “Delete” asks you to confirm, then deletes it.

  • Share a recipe

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Ways of working

Tools and recipes run in your browser, on your device.

  • Start from a file

    Drop it in the box on the home page and pick what you want to do. Choose one step to open its tool, or add more to make a recipe.

  • Start from a tool

    Search for the job or open a tool from the menu. When the result is ready, tap it in Results and pick the next tool under “Use it in”.

  • Keep the steps

    A saved recipe keeps its name, its tools in order and the setting of each step. It never keeps your files or their names.

  • Come back later

    Open My recipes in the same browser, on the same device, and run a recipe on a new file. A recipe stays there until you delete it or clear your browser data.

Finding tools again

Every tool and every recipe has its own address.

  • Bookmark it

    On a tool’s page, press Ctrl+D (⌘D on a Mac) to keep it in your browser’s bookmarks.

  • On your home screen

    A tool can sit on your phone’s home screen like an app. See Install, below, for how.

  • Your own recipes

    Recipes you saved are under “My recipes” in the menu.

  • The stars

    The stars under a new result ask how well the tool worked. Your answer helps us improve it. Stars do not save the tool for you.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari
  2. Tap Share (the square with the arrow)
  3. Choose “Add to Home Screen”, then Add

Android

  1. Open the tool in Chrome
  2. Tap the menu (⋮) at the top right
  3. Choose “Add to Home screen” or “Install app”

Computer

  1. Open the tool in Chrome or Edge
  2. Click the install icon in the address bar
  3. Choose Install

Regarding updates

We try to do regular updates and post new tools.

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Skills

Claude skills we use ourselves, one job each.