superduper.tools
Little tools.
Super duper useful.
Format, convert, count, generate — all on this device. Nothing you paste is uploaded. One labeled ad on tool pages, never over the work.
Text
Word counter
Words, characters, sentences, and reading time.
Case converter
Upper, lower, title, camel, snake, and kebab case.
Line tools
Sort, reverse, trim, and dedupe lines of text.
Lorem & slug
Filler paragraphs and kebab-case slugs from a title.
Diff
Compare two texts line by line.
Regex tester
Try a pattern against sample text and see matches.
Markdown preview
Write Markdown on the left, see HTML on the right.
Encode
Data
JSON formatter
Pretty-print, minify, and check JSON.
Unix timestamp
Convert seconds, milliseconds, and human dates.
Cron explainer
Turn a 5-field cron into plain English and next runs.
Header parser
Parse raw HTTP headers or a user-agent string.
CSV ↔ JSON
Convert tables either way in your browser.
Countdown
Time until a date, plus unix milliseconds.
Generate
Convert
Geometry
Triangle solver
SSS, SAS, ASA, and more — sides, angles, and area.
Circle calculator
Radius, diameter, area, circumference, arc, and sector.
Pythagorean
Solve for a leg or the hypotenuse.
Distance & midpoint
Two points: distance, midpoint, deltas, and slope.
Shape area
Rectangle, triangle, trapezoid, circle, and regular n-gon.
Angle converter
Degrees and radians, plus complementary and supplementary.
Volume & surface
Box, cylinder, sphere, cone, and square pyramid.