Useful tools. Clearer answers.
Understand the numbers, compare your options and get more from the tools you use. Explore practical guides for building, cooking, studying, selling and everyday planning.
Explore articlesBrowse our guides and find an explanation that fits your next task.
Our articles & guides
Newest articles first
Place a Text Watermark Where It Remains Readable
A watermark should be visible enough to serve its purpose without hiding the subject. Its position, size and opacity matter together, particularly…
Read a JWT Payload Without Treating It as Verified
A decoded token can look convincing because its header and claims are readable. Readability is not authentication. Someone can change a payload…
Blend a Colour Over an Image Without Replacing Its Shape
A tint can tie several images to a visual palette. It blends a chosen colour into their RGB values while leaving their…
Test Small Regular Expressions With Bounded Matches
A regular expression can match exactly what you expected in one example and behave badly in another. Testing a short pattern against…
Map an Image Between Two Chosen Colours
Duotone uses the light and dark structure of a picture to create a controlled two colour treatment. It is more predictable than…
Convert Opaque Colours Between HEX, RGB and HSL
A design specification may list a colour in HEX while an editor asks for RGB or HSL. The colour can be represented…
Invert RGB Colours and Review the Result’s Purpose
Colour inversion replaces each channel with its opposite value. It can help create an effect or inspect a dark asset, but it…
Create a Warm Sepia Version Without Recolouring Objects
Sepia gives an image a warm tonal treatment. It is useful as a visual style, but it does not selectively replace the…
Tell Decimal File Units Apart From Binary Units
A file allowance described as MB can be confused with MiB. The names refer to different multipliers, so the same written quantity…
Convert Colour to Grayscale Without Losing the Canvas
A grayscale version can be useful for a document, a restrained website asset or a comparison where colour is distracting. It replaces…
Convert Large Integers Between Number Bases
A long integer can lose precision if it is converted through a floating point number. That is a problem when you are…
Reduce Image Opacity and Keep the Alpha Channel
Opacity describes how much of an image is visible when it is placed over a background. Changing opacity can help create an…