Utilities

One question each, answered and done. All of it runs in the browser, so nothing you paste in goes anywhere.

17 of them

Text and data

3

Diff CheckerPaste a before and an after RegexRegular expressions with live matches JSON ToolPretty print, validate, minify, traverse

Encoding and hashing

4

EncodeEvery encoding of a string at once HashSHA and MD5 digests for any string CipherCaesar, Atbash, Vigenère, ROT13 and Base64 Morse CodeText to Morse and back, with audio playback

Generators

2

Password GeneratorCharacter sets in, entropy out UUID GeneratorRandom v4, time ordered v7, in batches

Colour

2

Colour PickerAny colour as HEX, RGB, HSL and OKLCH CSS GradientLinear, radial or conic gradients as CSS

Time

2

TimerA countdown with an alarm, and a stopwatch TimestampEpoch seconds to readable dates and back

Also here

4

Easing EditorA draggable cubic bezier editor FlashcardsStudy cards on a spaced repetition plan Palette ExtractorAn image's dominant colours by median cut Subnet CalculatorNetwork, broadcast and range for any IPv4