Tools

Make a background color transparent

Lock an image behind a password

Paint the pixels that changed

Blend the negative from 0 to 100%

Convert an image to monochrome

Derive it from a height map or photo

Apply a mosaic

Hide it by shuffling tiles

Make an image seamless

Threshold it into a seal

Tuck a file inside a PNG

Tell whether OPTIONS goes first

Compute the remaining freshness

Find names that break across OSes

Cross-check extension, MIME, and bytes

Find times that vanish or repeat

Get the sheet count and overlap

Every 20 minutes, look far for 20 seconds

Reacquire a target that jumps

Track a moving target with your eyes alone

Loosen retained images with full-screen patterns

Expose zero-width, BOM, and bidi controls

Expose names that merge under NFC/NFD

Pin down every LF, CRLF, and CR

Make a sprite sheet from a video

Turn four sources into one montage

Pull 16 stills out of a video

Issue v4 and v7 in bulk

Components, whole URLs, form values

Move between standard and base64url

Break a URL into its parts

See how the permission bits move

Turn indentation into a diagram