Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Sort lines descending
reverse alphabetical Z–A order, free
POST /str/sort-lines-descending$0.002Developer Utilities
Truncate Text to a Word Limit with an Ellipsis
POST /str/truncate-words$0.002Developer Utilities
Word wrap text to width
format paragraphs by column
POST /str/word-wrap$0.002Developer Utilities
Align text into columns
pad delimited fields into a readable table, free
POST /str/align-columns$0.002Developer Utilities
Find common lines in two texts
list intersection online
POST /str/common-lines$0.002Developer Utilities
Split a CSV row into lines
quoted fields handled correctly
POST /str/csv-row-to-lines$0.002Developer Utilities
Damerau–Levenshtein distance calculator
edit distance with transpositions
POST /str/damerau-levenshtein$0.002Developer Utilities
Dice coefficient similarity
Sørensen–Dice score from character bigrams
POST /str/dice-coefficient$0.002Developer Utilities
Line Diff Checker
Compare Text Line by Line
POST /str/diff-lines$0.002Developer Utilities
Extract capitalized words
list proper nouns and titles free
POST /str/extract-capitalized$0.002Developer Utilities
Extract lines matching regex
filter text and logs online
POST /str/extract-lines-matching$0.002Developer Utilities
Extract words starting with a prefix
filter vocabulary and tags, free
POST /str/extract-words-starting$0.002Developer Utilities
Case-insensitive find and replace
replace every text variant
POST /str/replace-ci$0.002Developer Utilities
Replace first occurrence
swap only the first match, leave the rest
POST /str/replace-first$0.002Developer Utilities
Multiple find and replace
apply several pairs in one pass
POST /str/replace-multiple$0.002Developer Utilities
Reverse paragraph order
reorder text blocks online
POST /str/reverse-paragraphs$0.002Developer Utilities
Split text into sentences
one sentence per line free
POST /str/split-sentences$0.002Developer Utilities
Baseline grid line height
snap text to vertical rhythm
POST /str/baseline-grid$0.002Developer Utilities
Longest Common Suffix Finder for Lines of Text
POST /str/common-suffix$0.002Developer Utilities
Check If Text Contains a Substring and Find Its Position
POST /str/contains$0.002Developer Utilities
Prevent text widows with a non-breaking space
POST /str/prevent-widows$0.002Developer Utilities
Pixels to em units
convert px font size to em for scalable CSS
POST /str/px-to-em$0.002Developer Utilities
Pixels to percent font size converter
PX to CSS percentage
POST /str/px-to-percent$0.002Developer Utilities
Pixels to points converter
px to pt for print fonts, free
POST /str/px-to-pt$0.002Developer Utilities
Anagram signature key
sorted-letter key for matching anagrams
POST /str/anagram-signature$0.002Developer Utilities
Count list items
one per line, ignore blanks option, free
POST /str/count-list-items$0.002Developer Utilities
Extract CSV column
pull one field by name or index, free
POST /str/csv-select-column$0.002Developer Utilities
Escape a CSV field
quote commas, newlines and double quotes
POST /str/escape-csv-field$0.002Developer Utilities
Golden ratio type scale generator from any base font size
POST /str/golden-type-scale$0.002Developer Utilities
Leading from font size and ratio
baseline spacing in px, free
POST /str/leading-from-ratio$0.002Developer Utilities
Convert lines to a JSON array
escape every string correctly
POST /str/lines-to-json-array$0.002Developer Utilities
Intersection of two lists
find common items
POST /str/list-intersection$0.002Developer Utilities
Lines to numbered Markdown list
format steps instantly
POST /str/markdown-numbered-list$0.002Developer Utilities
Remove Unicode variation selectors
strip FE0F/FE0E, free
POST /str/remove-variation-selectors$0.002Developer Utilities
Count duplicate list items
see which values repeat and how often
POST /str/count-duplicate-items$0.002Developer Utilities
Enumerate a list with indexes
zero-based or one-based labels
POST /str/enumerate-with-index$0.002Developer Utilities
Effective average speed with stops
door-to-door trip mean free
POST /travel/average-speed-with-stops$0.002Developer Utilities
Departure time calculator for a target arrival
POST /travel/departure-time-for-arrival$0.002Developer Utilities
Safe following distance calculator
2-second and 3-second rule gap
POST /travel/following-distance$0.002Developer Utilities
Compare two driving routes
time and fuel cost calculator
POST /travel/route-comparison$0.002Developer Utilities
Road trip toll cost estimator with transponder discount
POST /travel/toll-cost-estimate$0.002Developer Utilities
Car lease monthly payment calculator
POST /travel/car-lease-payment$0.002Developer Utilities
Fuel consumption from fill-up calculator
actual L/100km from tank refill
POST /travel/l100km-from-fillup$0.002Developer Utilities
MPG upgrade fuel savings calculator
annual gas and money saved
POST /travel/mpg-upgrade-savings$0.002Developer Utilities
Multi-stop route total distance
sum legs and cumulative mileage
POST /travel/multi-stop-route-distance$0.002Developer Utilities
Quarter-mile time estimate
ET and trap speed from HP and weight
POST /travel/quarter-mile-estimate$0.002Developer Utilities
Tire revolutions per mile calculator
POST /travel/tire-revolutions-per-mile$0.002Developer Utilities
Torque to horsepower calculator
convert lb-ft and RPM to HP
POST /travel/torque-to-horsepower$0.002Developer Utilities
Trip fuel cost per mile calculator
actual spend per mile or kilometer
POST /travel/trip-cost-per-mile$0.002Developer Utilities
Vehicle speed from RPM calculator
road speed by gear, final drive & tire
POST /travel/vehicle-speed-from-rpm$0.002Developer Utilities
Wheel offset and backspacing calculator for rim fitment
POST /travel/wheel-offset-backspacing$0.002Developer Utilities
Cold-start warm-up fuel calculator
idle burn × warm-up time
POST /travel/cold-start-fuel$0.002Developer Utilities
EV Battery Degradation Calculator
Capacity and Range After Years
POST /travel/ev-battery-degradation$0.002Developer Utilities
EV vs gas break-even calculator
miles until fuel savings pay back
POST /travel/ev-break-even-miles$0.002Developer Utilities
EV home vs public charging cost calculator
POST /travel/ev-home-vs-public$0.002Developer Utilities
EV range from battery and efficiency calculator
Wh per mile or km
POST /travel/ev-range-from-battery$0.002Developer Utilities
Speed at redline per gear calculator
max road speed by gear ratios
POST /travel/speed-at-redline$0.002Developer Utilities
Tire tread life calculator
remaining miles or km from tread depth
POST /travel/tire-tread-life$0.002Developer Utilities
Towing and payload capacity calculator
check trailer and vehicle loads
POST /travel/towing-capacity-check$0.002Developer Utilities
Aircraft endurance calculator
flight time after fuel reserve
POST /travel/aircraft-endurance$0.002