Developer tools
Fast, client-side developer utilities: formatters, encoders, converters, and quick reference. No build, no backend.
Open My Screen Your personal dashboard - add tools from any category onto one page.
Formatter
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JSON formatter
Format, validate, and minify JSON in your browser - paste it, prettify or minify, and copy the result. Nothing leaves your machine.
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Code to image
Turn code into a clean, syntax-highlighted PNG image in your browser - pick the background color, padding, font size, window controls, and text shadow, then download or copy it. Nothing leaves your machine.
Converter
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px to rem converter
Convert px to rem and em (and back) in your browser, with separate root and parent font sizes and a live px-to-rem reference table. Nothing leaves your machine.
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px to pt converter
Convert between the absolute CSS units - px, pt, pc, inches, cm, and mm - in your browser. Type any value and the rest update instantly. Nothing leaves your machine.
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Color converter
Convert colors between HEX, RGB, and HSL (with alpha) in your browser, with a live swatch. Type any format and the others update instantly. Nothing leaves your machine.
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Data size converter
Convert data sizes between bytes, KB, MB, GB, TB, and PB in your browser, with a decimal (1000) or binary (1024) base. Type any value and the rest update instantly. Nothing leaves your machine.
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Number base converter
Convert numbers between binary, octal, decimal, and hexadecimal in your browser. Type in any base and the others update instantly. Nothing leaves your machine.
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Angle converter
Convert angles between degrees, radians, gradians, and turns in your browser. Type any value and the rest update instantly. Nothing leaves your machine.
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CSV to JSON converter
Convert CSV to JSON and back in your browser, with delimiter and header options and a live preview table. Paste your data and copy the result. Nothing leaves your machine.
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YAML to JSON converter
Convert YAML to JSON and back in your browser, with a two-pane live editor and clear error messages. Paste either format and copy the other. Nothing leaves your machine.
Text
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URL encoder
Encode or decode URLs and query parameters in your browser - switch between component and full-URL escaping. Nothing leaves your machine.
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Slugify
Turn any text into a clean URL slug in your browser - lowercase, accents stripped, spaces and punctuation collapsed to hyphens. Nothing leaves your machine.
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Password generator
Generate strong random passwords or memorable passphrases in your browser, using the secure Web Crypto RNG. Nothing leaves your machine.
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Case converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case, and more in your browser. Nothing leaves your machine.
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Word counter
Count words, characters, sentences, lines, and paragraphs as you type, with reading time, in your browser. Nothing leaves your machine.
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HTML entity encoder
Encode or decode HTML entities in your browser - escape special characters or named and numeric entities, and decode them back. Nothing leaves your machine.
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Unicode explorer
Inspect Unicode characters and convert text to and from \u escape sequences in your browser, with a per-character breakdown. Nothing leaves your machine.
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Base64 encoder / decoder
Encode or decode Base64 in your browser - text (UTF-8 safe) with a standard or URL-safe variant, plus turn any file into a data URI. Nothing leaves your machine.
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Line tools
Sort, dedupe, reverse, shuffle, trim, and clean lines of text in your browser, with live line and unique counts. Nothing leaves your machine.
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Text diff
Compare two texts in your browser and see exactly what changed, line by line, with word-level highlighting and a side-by-side or unified view. Nothing leaves your machine.
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Regex tester
Test regular expressions in your browser with live match highlighting, capture groups, every JavaScript flag, a replace preview, and a built-in cheatsheet. Nothing leaves your machine.
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URL parser
Parse a URL in your browser into its scheme, host, port, path, query parameters, and fragment, all decoded and easy to read. Nothing leaves your machine.
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String escaper
Escape and unescape strings in your browser for JSON, SQL, shell, and regular expressions - pick a target and get a safely escaped string, or decode a JSON string back. Nothing leaves your machine.
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Cron expression explainer
Explain a cron expression in plain English in your browser and see the next run times - paste a five-field schedule and get a human-readable description. Nothing leaves your machine.
Time
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Unix timestamp converter
Convert Unix timestamps to human-readable dates and back in your browser - auto-detects seconds or milliseconds, shows local and UTC time, and gives a live current timestamp. Nothing leaves your machine.
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Time zone converter
Compare times across time zones in your browser with a visual meeting planner - stacked 24-hour strips aligned to one timeline so overlapping working hours are obvious. Nothing leaves your machine.
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Time standards converter
See one instant across every time standard in your browser - UTC, local, Unix, TAI, GPS time, TT, Julian Date, MJD, day of year, ISO week, and GMST - with a bundled leap-second table. Nothing leaves your machine.
Generator
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UUID generator
Generate random UUIDs (version 4) and ULIDs in your browser, in bulk, with one-click copy. Uses the secure Web Crypto RNG. Nothing leaves your machine.
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Lorem ipsum generator
Generate lorem ipsum placeholder text in your browser - by paragraphs, sentences, or words, as plain text or HTML, with one-click copy. Nothing leaves your machine.
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QR code generator
Generate a QR code in your browser from text, a URL, or Wi-Fi credentials, and download it as PNG or SVG. Everything is created locally. Nothing leaves your machine.
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CSS box-shadow generator
Build a CSS box-shadow visually in your browser - offset, blur, spread, color, and inset, with a live preview and the ready-to-copy CSS. Nothing leaves your machine.
Calculator
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Aspect ratio calculator
Calculate aspect ratios in your browser: lock a ratio like 16:9 and solve the missing width or height, with common presets. Nothing leaves your machine.
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Color contrast checker
Check color contrast against the WCAG AA and AAA thresholds in your browser - pick two colors and see the ratio with pass or fail badges for normal and large text. Nothing leaves your machine.
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chmod calculator
Calculate Unix file permissions in your browser: toggle the read, write, and execute bits and read off the octal value and the ls -l symbolic string, with a plain-English explainer. Nothing leaves your machine.
Commands
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Git commands
A searchable git command reference - common tasks like "undo the last commit" or "rename a branch" paired with the exact command, grouped by intent and filterable. Runs entirely in your browser.
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Bash commands
A searchable bash and Linux command reference - everyday shell tasks paired with the exact command, grouped by intent and filterable. Runs entirely in your browser.
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Docker commands
A searchable Docker command reference - image, container, and compose tasks paired with the exact command, grouped by intent. Runs entirely in your browser.
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chmod permissions
A searchable chmod and permissions reference - octal modes, the rwx bits, special bits, and symbolic syntax, each explained. Runs entirely in your browser.
Web & network
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HTTP headers
A searchable HTTP headers reference - request and response headers, each with a one-line meaning and example, grouped by purpose and filterable. Runs entirely in your browser.
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Well-known ports
A searchable well-known ports reference - port numbers mapped to their service and transport, grouped by purpose and filterable. From 80 and 443 to 5432 and 6379. Runs entirely in your browser.
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MIME types
A searchable MIME types reference - file extensions mapped to their Content-Type, grouped by kind and filterable. Runs entirely in your browser.
Syntax & markup
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Regex cheatsheet
A searchable regular-expression cheatsheet - anchors, character classes, quantifiers, groups, lookaround, and flags, each with an example. Runs entirely in your browser.
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Markdown cheatsheet
A searchable Markdown cheatsheet - every syntax with a live rendered preview per row, grouped and filterable. Runs entirely in your browser.
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HTML tags
A searchable HTML tags reference - every element with a one-line meaning and a still-legit flag, grouped by purpose and filterable. Runs entirely in your browser.
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Date format tokens
A searchable date format reference - PHP date() and C/strftime tokens side by side with an example each, grouped by part of the date. Runs entirely in your browser.
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Unicode & ASCII symbols
A searchable Unicode and ASCII symbol reference - arrows, currency, math, punctuation, Greek, and box-drawing characters, each with its name and every code (U+, HTML entity, CSS escape, decimal). Click a glyph to copy it. Runs entirely in your browser.