Tools

Password-based AES-256-GCM demo via Web Crypto.

• aes
• encryption
• pbkdf2
• crypto

Age in years, months, and days between two dates.

• age
• date
• calculator
• math

Convert area units like acres, hectares, and m².

• area
• unit-converter
• converter
• measurement

Convert text to character codes and back.

• ascii
• unicode
• text
• converter

Simplify a ratio and scale to a target dimension.

• aspect-ratio
• resize
• calculator
• math

Unicode-safe Base64 encode/decode for text and files locally.

• base64
• encode
• decode
• developer

Convert text to binary and binary to text.

• binary
• text
• converter
• encoding

BMI and weight category in metric or imperial.

• bmi
• health
• calculator
• fitness

Adjustable-shift Caesar cipher, encode and decode.

• caesar
• cipher
• encode
• decode

Client-side canonical URL heuristics (no crawl).

• canonical
• seo
• url
• duplicate

Convert naming cases locally with smart word splitting.

• case
• camelcase
• snake-case
• kebab-case

Sorted character frequency report with percentages.

• character-frequency
• text
• counter
• analysis

Flip virtual coins with fair, local randomness.

• coin
• flip
• random
• generator

Convert HEX, RGB, and HSL locally with a live swatch.

• hex
• rgb
• hsl
• color

Blend two HEX colors with a mix ratio.

• color
• palette
• design

Sample image colors and copy hex/rgb locally.

• color
• picker
• palette
• hex

Find complementary and split-complementary colors.

• color
• palette
• design

Future value and interest earned from compounding.

• compound-interest
• investing
• calculator
• finance

Check WCAG AA/AAA contrast ratios for text colors.

• contrast
• wcag
• accessibility
• aa

Count down from a duration or to a target time.

• timer
• countdown
• productivity
• clock

Turn cron expressions into readable schedules.

• cron
• scheduler
• developer
• devops

Map CSS color names to HEX and back.

• color
• palette
• design

Convert bytes, KB, MB, GB, TB, and binary units.

• data-size
• unit-converter
• converter
• storage

Roll virtual dice with fair, local randomness.

• dice
• random
• generator
• rpg

Line-level text diff with inline and side-by-side views.

• diff
• text
• compare
• developer

Final price and savings from a percent-off discount.

• discount
• sale-price
• calculator
• finance

Pull deduplicated email addresses from text.

• email
• extract
• text
• regex

Find and replace text with optional regex support.

• find-replace
• regex
• text
• transformer

Weighted 4.0-scale GPA from grades and credits.

• gpa
• grades
• calculator
• education

Build CSS linear-gradient strings with a live preview.

• color
• palette
• design

SHA-256/512 hashing for text and files via Web Crypto.

• hash
• sha256
• sha512
• checksum

Convert text to hex and hex to text.

• hex
• text
• converter
• encoding

HMAC-SHA256/384/512 signing via Web Crypto.

• hmac
• sha256
• webhook
• signature

Tune hue, saturation, and lightness from a base HEX.

• color
• palette
• design

HTML entity encode/decode for markup and text locally.

• html
• entities
• encode
• decode

Parse raw HTTP headers into a structured list.

• http
• headers
• parser
• debugging

Compress images locally with quality and size controls.

• image
• compress
• jpeg
• webp

Crop images with accessible numeric controls.

• image
• crop
• trim
• rectangle

Convert images to PNG, JPEG, or WebP locally.

• image
• convert
• png
• jpeg

Resize images by size or percent, locally.

• image
• resize
• scale
• dimensions

Convert JSON arrays to CSV and back locally.

• json
• csv
• converter
• data-format

Format, validate, and minify JSON locally in your browser.

• json
• formatter
• validator
• developer

Minify JSON locally into a compact single-line string.

• json
• minifier
• compress
• developer

Validate JSON locally with clear syntax error messages.

• json
• validator
• syntax
• developer

Convert JSON and YAML both ways in your browser.

• json
• yaml
• converter
• developer

Inspect JWT header and payload locally—no signature verify.

• jwt
• token
• decode
• security

Local text stats and keyword density (no snake oil).

• keyword
• density
• seo
• text

Convert length units instantly in your browser.

• length
• unit-converter
• converter
• measurement

Remove duplicate lines from a list instantly.

• dedupe
• lines
• text
• cleanup

Sort lines A–Z or Z–A instantly.

• sort
• lines
• text
• alphabetize

Shuffle or pick unique random entries from a list.

• list
• randomizer
• shuffle
• random

Amortized monthly loan payment and total interest.

• loan
• amortization
• calculator
• finance

Autosaving notepad that stays on your device.

• notepad
• notes
• productivity
• localstorage

Local lorem ipsum by paragraphs, words, or bytes.

• lorem
• ipsum
• placeholder
• text

Live GFM preview with sanitized, XSS-safe rendering.

• markdown
• text
• preview
• gfm

SERP-style meta title and description preview.

• meta
• seo
• serp
• title

Convert bin/oct/dec/hex locally with BigInt.

• binary
• hex
• octal
• decimal

OG card layout mocks and meta tag export.

• open-graph
• og
• seo
• social

Generate complementary, analogous, and triadic palettes from a base HEX.

• color
• palette
• design

Secure local password generator with strength meter.

• password
• security
• random
• generator

Local entropy and checklist-based password strength check.

• password
• security
• strength
• entropy

Merge PDFs locally with full order control.

• pdf
• merge
• combine
• document

View and edit basic PDF metadata locally.

• pdf
• metadata
• properties
• document

Extract PDF page ranges locally with validation.

• pdf
• split
• extract
• pages

Inspect PEM structure and Base64 body locally.

• pem
• certificate
• csr
• x509

Percent of, percent-of-total, and percent change.

• percentage
• percent-change
• calculator
• math

Focus with automatic Pomodoro work/break cycles.

• pomodoro
• timer
• productivity
• focus

Check primality and list primes up to a limit.

• prime
• number-theory
• calculator
• math

Create PNG/SVG QR codes locally—no API.

• qr
• qrcode
• generator
• svg

Parse and build URL query strings safely, client-side.

• url
• query-string
• parser
• developer

Generate random HEX colors with crypto randomness.

• color
• palette
• design

Generate random integers in any range, locally.

• random
• number
• generator
• integer

Generate random strings with custom character sets.

• random
• string
• generator
• token

Estimate minutes-to-read from word count and WPM.

• reading-time
• word-count
• text
• counter

Test regex patterns with flags, highlights, and safe timeout protection.

• regex
• developer
• pattern
• replace

Strip blank and whitespace-only lines instantly.

• empty-lines
• text
• cleanup

Join wrapped lines into flowing paragraphs.

• line-breaks
• text
• cleanup

Form-based robots.txt builder with download.

• robots
• seo
• crawler
• sitemap

Convert numbers to and from Roman numerals.

• roman-numerals
• numbers
• converter

Classic ROT13 letter-shift cipher, encode = decode.

• rot13
• cipher
• encode
• decode

Check for missing common security response headers.

• security-headers
• csp
• hsts
• http

Build basic sitemap XML from a URL list.

• sitemap
• xml
• seo
• urlset

URL slugify with diacritic stripping, locally.

• slug
• url
• seo
• permalink

Convert speed units like mph, km/h, and knots.

• speed
• unit-converter
• converter
• measurement

Count, mean, median, mode, and stdev from a list.

• statistics
• mean
• median
• calculator

Time tasks with a start/stop/lap stopwatch.

• stopwatch
• timer
• productivity
• laps

Sanitize, preview, and clean SVG locally.

• svg
• viewer
• sanitize
• optimize

Convert Celsius, Fahrenheit, and Kelvin instantly.

• temperature
• unit-converter
• converter
• measurement

Repeat text N times with an optional separator.

• repeat
• text
• generator

Reverse text, lines, or words instantly.

• reverse
• text
• transformer

Convert Unix timestamps and dates with timezone display.

• timestamp
• unix
• date
• timezone

Generate tints and shades from a base HEX color.

• color
• palette
• design

Tip amount, total, and per-person bill split.

• tip
• bill-split
• calculator
• finance

Approximate prompt tokens locally without calling an AI API.

• ai
• tokens
• prompt
• llm

Build unsigned JWTs for learning—never for production.

• jwt
• security
• education
• alg-none

URL percent-encoding with component and URI modes locally.

• url
• encode
• decode
• percent-encoding

Generate UUID v4 and v7 IDs locally with bulk output.

• uuid
• guid
• random
• generator

Add or remove VAT and see net/gross amounts.

• vat
• tax
• calculator
• finance

Convert volume units for cooking, science, and more.

• volume
• unit-converter
• converter
• measurement

Convert weight and mass units locally.

• weight
• unit-converter
• converter
• measurement

Trim and normalize whitespace in text instantly.

• whitespace
• trim
• text
• cleanup

Live word, character, sentence, and line counts.

• word-count
• character-count
• text
• counter

Get a weighted random Yes or No answer.

• yes-no
• random
• generator
• decision