Use free calculators, converters, and generators. All tools process data locally in your browser.
Choose a workflow to find tools for your task.
Pick a goal to filter the tools. All tools stay in your browser.
Selected. I need to inspect, fix, or convert data fast
Format, decode, and convert data. JSON, XML, YAML, CSV, encoders, and unit converters.
I need to validate and test before shipping
Check code, APIs, regex, and specs. Find issues before your users do.
I need to design a UI that looks pro
Build palettes, shadows, and gradients. Ship a clean interface.
I need to send money or run a business
Price your work and plan your money. Invoices, pricing, taxes, loans, and unit economics.
I need to get hired — or hire well
Tune your resume, plan interviews, grade job briefs, and run hiring loops.
I need answers fast
Get quick answers. Split bills, plan sleep, pace learning, and count time and money.
I need to generate content, docs, and boilerplate
Create README files, robots.txt, social images, QR codes, invoices, and styled text.
I need to lead my engineering team
Track delivery, plan architecture, and run healthy team rituals.
Test JavaScript regular expressions with live match highlighting, capture groups, and a plain-English breakdown of every token.
Build and decode cron schedules visually. Get the next 5 run times, a human-readable description, and copy-ready syntax.
Beautify, minify, sort keys, and validate JSON instantly. Side-by-side diff mode for comparing two payloads.
Decode JSON Web Tokens client-side. Inspect header, payload, expiry, and algorithm without sending the token to any server.
Paste raw CSS to get Tailwind utility classes, or paste Tailwind classes to get equivalent CSS. Supports the 60+ most common properties.
Build your custom workout split, edit every exercise, pick colours per day, then download a beautiful shareable card as PNG, PDF or JSON. Free, no signup.
Generate v4 (random) and v5 (name-based) UUIDs instantly. Bulk-generate dozens at once with optional uppercase formatting.
Encode or decode Base64 instantly with auto-detection, live preview, and full Unicode (emoji) support. 100% client-side.
Encode and decode URL components with encodeURIComponent vs encodeURI modes, plus query-string formatting for form payloads.
Convert text to and from HTML entities — named or numeric — so tags render as plain text and content stays safe to embed.
Convert Unix timestamps to human-readable dates and back. Live clock, millisecond support, and one-click presets for common formats.
Convert a time between any two timezones, compare multiple cities side-by-side, and see UTC offsets — perfect for remote teams.
Score passwords in real time with entropy, character-class analysis, common-password detection, and actionable improvement tips.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser via Web Crypto. Optional HMAC with a custom secret key.
Format messy SQL into readable, indented queries with configurable keywords per line. Supports SELECT, INSERT, UPDATE, DELETE and more.
Compare two texts side-by-side with word and line-level diffing, change statistics, and a unified view. Nothing leaves your browser.
Convert Markdown to clean HTML with live preview, syntax highlighting for code fences, and copy-ready output.
Count words, characters, sentences, paragraphs, and reading time in real time. Keyword density checker for SEO content.
Run JavaScript instantly in a sandboxed browser worker. Interactive Map/Set/object trees, fetch inspection, loop protection, and rule-based error explanations.
A fast, private notepad in your browser. Auto-save multiple notes locally, track word counts, and download or copy your writing anytime.
Convert text to camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE, title case, and more — with instant live conversion.
Turn any title or phrase into a clean, SEO-friendly URL slug — lowercase, hyphenated, and safe for routing. Options for underscores and length limits.
Generate placeholder text by paragraphs, sentences, or words. Choose classic or developer-flavored variants and copy instantly.
Convert JSON arrays to CSV with automatic header detection, delimiter options, and a live table preview. Fully client-side.
Parse CSV into clean JSON with delimiter and header handling, plus a data preview table and copy-ready output.
Generate TypeScript interfaces from any JSON — with optional arrays detection, null handling, and PascalCase naming. Like quicktype, in your browser.
Generate secure random passwords with configurable length, character sets, and an entropy readout. Copy or generate a whole batch.
Convert between decimal, binary, hex, and octal with live bit-width display and byte breakdowns. Perfect for bit manipulation work.
Convert images to Base64 data URIs with drag-and-drop, size stats, and a live preview — perfect for inline assets and CSS backgrounds.
Score any text with Flesch Reading Ease, Flesch-Kincaid grade level, and reading time. Optimize content for both users and SEO.
Sort, reverse, dedupe, trim, shuffle, prefix, or build SQL IN lists from any block of text lines.
Paste CSV and copy a clean GitHub-flavored Markdown table — or convert tables back to CSV, fast.
Validate, pretty-print, or minify any XML document — feeds, configs, and API payloads.
Convert between YAML and JSON in both directions, with syntax highlighting on errors and instant output.
Generate seeded, reproducible dummy records (names, emails, salaries, UUIDs) as CSV, JSON, or SQL.
Compress images and convert them to WebP or AVIF locally in your browser without uploading files.
Query nested JSON with JSONPath expressions and inspect matching values instantly.
Parse, edit, encode, and build URL query strings with a live preview.
Create unsigned JWT test tokens locally with claims, expiry presets, and warnings.
Clean and minify SVG markup locally while preserving useful vector output.
Validate JSON data against a JSON Schema and see precise path-level errors.
Compare semantic versions and test npm-style version ranges instantly.
Minify HTML while preserving safe text and producing compact markup.
Convert SVG markup into React-friendly JSX with safe attribute names.
Generate a GitHub-ready Markdown table of contents from headings.
Create a structured project README with setup, usage, and contribution sections.
Turn release notes into a clean Keep a Changelog-compatible document.
Review technical writing for clearer sentences, safer wording, passive voice, vague terms, and readability.
Take a one-minute typing test. Track net WPM, gross speed, and accuracy. No sign up, runs in your browser.
Click the moment the panel turns green. Measure reaction time in milliseconds, track your session best and average, and challenge friends.
Drop one image and download every favicon size from 16px to 512px, plus the ready-to-paste link tags.
A clean online pomodoro timer. Set focus, short break, and long break lengths, then work in rounds without an account.
Download any YouTube or Shorts thumbnail in all sizes — from max-res 1280×720 down — right in your browser.
Turn typed text into realistic handwritten pages as a printable PNG, with ink and ruled-paper options.
Rotate every page of a PDF by 90, 180, or 270 degrees — done in your browser, no upload.
Delete pages from a PDF by tapping a page grid — cut and download locally, no watermark.
Stamp page numbers onto any PDF in a chosen corner with a custom format and starting number.