169 tools. No sign-up. Nothing installed.
Generate QR codes from text or URLs online — free, no upload. Download as PNG or SVG and adjust size and error correction.
/qr
Encode and decode URLs online — free, no upload. Inspect query params and path segments with a per-character breakdown in your browser.
/url-encode
Build UTM tracking URLs online — free, in your browser. Set source, medium, campaign, term, and content and copy the final URL.
/utm
Compare two URLs online — free, no upload. See differences in scheme, host, port, path, query parameters, and fragment highlighted.
/url-diff
Build Open Graph and Twitter Card tags online — free, in your browser. Fill a form and preview the social card live.
/og-tags
Decode suspicious URLs online — free, no upload. Exposes punycode hosts, credential tricks, and recursive redirect parameters.
/url-deobfuscate
Convert route patterns to regex online — free, in your browser. Express, Next.js, Django, Rails, and Angular with a match tester.
/route-regex
Build git commands interactively online — free, in your browser. Pick an action, toggle flags, and get the command with descriptions.
/git-command
Format conventional commit messages online — free, in your browser. Type, scope, body, breaking changes, and issue references.
/commit-message
Parse and compare semantic versions online — free, in your browser. Validate, bump major, minor, or patch, with pre-release support.
/semver
Create changelogs from git log output online — free, no upload. Entries grouped by commit type in Keep a Changelog format.
/changelog
Generate .gitignore files for any stack online — free, in your browser. Node, Python, Go, Rust, .NET, macOS, VS Code, and more.
/gitignore
Generate branch names online — free, in your browser. Gitflow, GitHub Flow, Jira-prefixed, and conventional from a ticket ID.
/branch-name
Explain merge conflicts online — free, no upload. Side-by-side ours/theirs view with a resolution checklist.
/conflict-explain
Generate .gitattributes files online — free, in your browser. Line endings, linguist-generated, export-ignore, and Git LFS rules.
/gitattributes
Generate SHA-256, SHA-1, MD5, and SHA-512 hashes online — free, no upload. Text is hashed in your browser; nothing reaches a server.
/hash
Encrypt and decrypt text with AES-GCM online — free, private, no upload required. Web Crypto API with passphrase or key-based modes.
/aes
Generate RSA key pairs online and encrypt messages — free, private, no upload required. Public and private keys stay in your browser.
/rsa
Generate HMAC signatures with SHA-256 and more online — free, private, no upload required. Verify message integrity client-side.
/hmac
Hash passwords into secure PBKDF2 keys online — free, private, no upload required. Configurable iterations, salt length, and output size.
/pbkdf2
Decode a JWT online — free, private, no upload required. See header, payload, and expiry instantly.
/jwt
Generate TOTP codes online — free, private, no upload required. RFC 6238 with a live countdown and a QR for authenticator apps.
/totp
Analyze password strength online — free, private, no upload required. Entropy, crack-time estimates, and pattern weaknesses.
/password-analyze
Generate strong passwords online — free, no upload. Set length and character sets, see the entropy estimate, all in your browser.
/password
Inspect SSH public keys online — free, private, no upload required. Type, bit length, SHA256 fingerprints; nothing executed.
/ssh-key-inspect
Build Content-Security-Policy headers visually online — free, in your browser. Toggle directives, keywords, and sources with live preview.
/csp
Browse HTTP security headers online — free, in your browser. Recommended values plus Nginx, Apache, Express, and ASP.NET configs.
/security-headers
Identify hash algorithms online — free, no upload. Detects MD5, SHA-1, SHA-256, SHA-512, bcrypt, argon2, and more.
/hash-identify
Generate Permissions-Policy headers online — free, in your browser. Visual toggles plus Nginx, Apache, Express, and ASP.NET snippets.
/permissions-policy
Compute Subresource Integrity hashes online — free, no upload. SHA-256, SHA-384, and SHA-512 for scripts and stylesheets.
/sri
Build HSTS headers online — free, in your browser. Max-age slider, subdomains toggle, and preload eligibility check.
/hsts
Inspect HTML heading outlines online — free, no upload. Skipped levels, multiple h1 elements, and empty headings flagged.
/a11y-outline
Check image alt text online — free, no upload. Flags missing, filename-like, duplicated, or overlong alt attributes in HTML.
/a11y-alt
Inspect keyboard focus order online — free, no upload. Tab order, positive tabindex, unnamed controls, and click-only elements.
/a11y-keyboard
Search ARIA roles online — free, in your browser. Required states, supported properties, and permitted parents and children.
/aria-ref
Browse a WCAG 2.2 checklist online — free, in your browser. Filter by principle and level, with links to the W3C understanding docs.
/wcag-checklist
Generate docker-compose.yml files visually online — free, in your browser. Add PostgreSQL, Redis, Nginx, MongoDB with port and volume overrides.
/docker-compose
Generate production-ready Dockerfiles online — free, in your browser. Node, Python, Go, Rust, .NET, Java with multi-stage and non-root options.
/dockerfile
Build docker run commands interactively online — free, in your browser. Pick flags and options with live preview and copy.
/docker-run
Generate nginx configuration files online — free, in your browser. Reverse proxy, static files, load balancer, and SSL templates.
/nginx-config
Generate Kubernetes manifests online — free, in your browser. Deployments, Services, ConfigMaps, Ingress, and PVCs.
/k8s-yaml
Generate CI/CD pipelines online — free, in your browser. GitHub Actions and GitLab CI with Node, Python, Go, and Docker templates.
/cicd
Generate Apache .htaccess files online — free, in your browser. Redirects, rewrites, auth, cache, gzip, and security headers.
/htaccess
Generate robots.txt files online — free, in your browser. User-agent rules, allow and disallow paths, sitemap, and crawl-delay.
/robots-txt
Build systemd unit files online — free, in your browser. Service, timer, and socket sections with validated keys and values.
/systemd-unit
Parse .env files and convert them online — free, no upload. Validate and export JSON, YAML, and Docker formats; catch duplicate keys.
/env-manager
Build .editorconfig files online — free, in your browser. Glob patterns mapped to indent, charset, and line-ending settings.
/editorconfig
Generate Makefiles online — free, in your browser. Go, C/C++, JavaScript, Python, and Rust with build, test, run, and lint targets.
/makefile
Generate open source licenses online — free, in your browser. MIT, Apache-2.0, GPL-3.0, BSD, ISC, MPL, and Unlicense with badge.
/license
Generate bash script boilerplate online — free, in your browser. Strict mode, color output, logging, argument parsing, and traps.
/shell-script
Generate .pre-commit-config.yaml online — free, in your browser. Lint and format hooks: ESLint, Prettier, Black, and more.
/pre-commit
Encode and decode Base64, Base32, Hex, and URL text online — free, no upload. Bidirectional conversion with a live preview.
/encodeDecode
Generate UUIDs online — free, no upload. Bulk-create v4 and v7 identifiers in your browser and copy them instantly.
/uuid
Create and sign JWTs online — free, private, no upload required. HS256 or RS256; the private key never leaves your browser.
/jwt-builder
Generate ULIDs online — free, no upload. Sortable, URL-safe identifiers with decoded timestamps, created in your browser.
/ulid
Generate NanoIDs online — free, no upload. Custom alphabet and length with cryptographically secure randomness.
/nanoid
Convert images to Base64 data URIs and back online — free, no upload. Drag-and-drop PNG, JPEG, GIF, and SVG files.
/image-base64
Convert text to hex and back online — free, no upload. UTF-8 bytes with an ASCII column view and separator options.
/hex-text
Encode and decode Crockford Base32 online — free, no upload. Optional checksum symbols and ambiguous-character normalization.
/crockford32
Encode and decode classic ciphers online — free, in your browser. ROT13, Caesar, Atbash, and Vigenere, for education only.
/ciphers
Convert text case online — free, no upload. Switch between camelCase, snake_case, kebab-case, and PascalCase instantly in your browser.
/case
Sort text lines online — free, in your browser. Natural, locale, length, or numeric order; dedupe, shuffle, reverse, trim.
/text-sort
Escape and unescape text online — free, no upload. HTML, XML, JavaScript, shell, and regex modes with round-trip checks.
/string-escape
Count words and characters online — free, no upload. Live word, sentence, and reading-time stats as you type, in your browser.
/counter
Generate Lorem Ipsum placeholder text online — free, in your browser. By paragraphs, sentences, or words, ready to paste.
/lorem
Convert titles to URL-safe slugs online — free, in your browser. Custom separators, transliteration, and duplicate handling.
/slug
Analyze text readability online — free, no upload. Flesch Reading Ease and Flesch-Kincaid grade with reading time and stats.
/readability
Count word frequency online — free, no upload. Sort by occurrences, filter stop words, and set a minimum length.
/word-freq
Compute Levenshtein edit distance online — free, no upload. Step-by-step insertions, deletions, and substitutions shown.
/levenshtein
Search Unicode characters by name, code point, or block online — free, in your browser. Copy code points and entities instantly.
/unicode
Convert YAML to JSON and back online — free, no upload. Validate syntax and preserve key order, round-trip safe in your browser.
/yaml-json
Compare JSON online — free, no upload. Structural differences highlighted in side-by-side and unified views.
/json-diff
Convert JSON to CSV and back online — free, no upload. Handles nested objects and custom delimiters, entirely in your browser.
/csv
Convert TOML to JSON and back online — free, no upload. Round-trip conversion powered by smol-toml in your browser.
/toml-json
Convert XML to JSON and back online — free, no upload. Uses the browser DOMParser and XMLSerializer, entirely client-side.
/xml-json
Generate JSON Schema Draft-07 from sample payloads online — free, no upload. Type and format detection, inferred in your browser.
/json-schema
Validate and reformat CSV online — free, no upload. Custom delimiters, quote characters, whitespace trimming, BOM stripping.
/csv-format
Repair malformed JSON online — free, no upload. Fixes trailing commas, unquoted keys, and JavaScript-style comments.
/json-repair
Convert JSON5 to strict JSON and back online — free, no upload. Comments and trailing commas handled with precise error reporting.
/json5
Apply RFC 6902 JSON Patches online — free, no upload. Add, remove, replace, move, copy, and test with live results.
/json-patch
Convert NDJSON to JSON online — free, no upload. Pretty or compact output with per-line errors and skip-invalid mode.
/ndjson
Preview code with syntax highlighting online — free, in your browser. Monaco-powered editor supporting many languages.
/code
Format code with Prettier online — free, no upload. JavaScript, TypeScript, JSON, HTML, CSS, and Markdown supported.
/formatter
Generate TypeScript interfaces from JSON online — free, no upload. Unions, optionals, and nested types inferred in your browser.
/json-ts
Evaluate JSONPath expressions online — free, no upload. Supports $, ., .., [*], [n], slices, and filters with live results.
/jsonpath
Format GraphQL online — free, no upload. Pretty-print schemas and operations with the official graphql-js parser.
/graphql-format
Minify HTML online — free, no upload. Strips whitespace and comments with before/after byte sizes and reduction shown.
/html-minify
Generate CSS gradients online — free, in your browser. Design linear and radial gradients visually and copy CSS or Tailwind instantly.
/gradient
Build CSS box shadows online — free, in your browser. Stack layers, tweak inset and spread, and copy the CSS with a live preview.
/box-shadow
Design CSS border-radius visually online — free, in your browser. Sliders output shorthand or longhand instantly.
/border-radius
Convert px, rem, em, vh, vw, and % CSS units online — free, in your browser. Configurable base font size.
/css-unit
Build flexbox layouts visually online — free, in your browser. Container and item properties with the CSS output.
/flexbox
Generate CSS grid templates online — free, in your browser. Column and row tracks plus gap from count and unit settings.
/css-grid
Generate fluid clamp() type scales online — free, in your browser. Base size, ratio, and viewport range in, CSS out.
/type-scale
Design cubic-bezier easing curves online — free, in your browser. Drag control points, preview motion, copy with presets.
/bezier
Preview Markdown online with a live HTML render — free, no upload. CommonMark compliant and XSS-safe, entirely client-side.
/markdown-preview
Convert Markdown to HTML online — free, no upload. Copy raw markup for CMS integrations and email templates.
/md-to-html
Convert HTML to Markdown online — free, no upload. Headings, links, lists, code, and nested elements handled.
/html-to-md
Convert Markdown to Confluence wiki markup online — free, no upload. Paste the output straight into the Confluence editor.
/md-confluence
Convert Markdown to Jira wiki markup online — free, no upload. Ready for issue descriptions and comments.
/md-jira
Build Markdown tables visually online — free, in your browser. Add columns and rows, edit cells, copy the formatted output.
/md-table
Generate a Markdown table of contents online — free, no upload. Configurable depth with duplicate slug handling.
/md-toc
Parse YAML frontmatter in Markdown online — free, no upload. Add, rename, or remove fields visually.
/md-frontmatter
Browse a Markdown syntax reference online — free, in your browser. Headings, emphasis, lists, links, code blocks, and tables.
/markdown-ref
Format SQL queries online — free, no upload. Pretty-print MySQL, PostgreSQL, SQLite, and T-SQL in your browser.
/sql-formatter
Generate SQL INSERT statements from JSON online — free, no upload. Dialect-aware with single-quote escaping.
/json-to-sql
Convert CSV to SQL INSERT statements online — free, no upload. Quoted fields and special characters handled.
/csv-to-sql
Generate TypeScript interfaces from CREATE TABLE DDL online — free, no upload. SQL types mapped, nullable columns marked.
/sql-to-ts
Build SELECT queries visually online — free, in your browser. Choose columns, WHERE, JOIN, ORDER BY, LIMIT, and dialect.
/sql-query
Design database schemas visually online — free, in your browser. Generate CREATE TABLE DDL from tables, columns, and constraints.
/sql-schema
Browse a SQL reference online — free, in your browser. Keywords, data types, aggregate functions, and transaction commands.
/sql-ref
Explain MySQL and PostgreSQL EXPLAIN plans online — free, no upload. Parse and visualize query execution operations step by step.
/sql-explain
Compare text online and see every difference — free, no upload. Line-by-line diff with additions and removals highlighted instantly.
/text-diff
Compare CSV datasets row by row online — free, no upload. Added, removed, and changed rows detected instantly.
/csv-diff
Compare XML documents online — free, no upload. Structural changes highlighted line by line after normalization.
/xml-diff
Compare YAML documents online — free, no upload. Key-sorted diff highlights semantic changes after normalization.
/yaml-diff
Compare HTML documents online — free, no upload. Normalized attribute order, structural differences highlighted line by line.
/html-diff
Compare Markdown documents online — free, no upload. Added and removed lines highlighted with context.
/md-diff
Estimate token counts for AI model input online — free, no upload. Character, word, and line counts alongside, in your browser.
/token-counter
Build reusable prompt templates online — free, in your browser. {{variable}} slots filled in with a live preview.
/prompt-template
Build system prompts online — free, in your browser. Role, context, rules, and output format blocks with toggle controls.
/system-prompt
Build JSON mode schemas for LLM tool-calling online — free, in your browser. OpenAI and Anthropic formats from one form.
/json-mode
Estimate LLM API costs online — free, in your browser. Enter input and output token counts for any model.
/prompt-cost
Estimate context window usage online — free, no upload. Token counts for Claude, GPT-4, Gemini, and more, computed locally.
/context-planner
Visualize RAG text chunking online — free, no upload. Set chunk size and overlap and preview the actual segments.
/rag-chunk
Compare AI models online — free, in your browser. Context window, pricing, vision, and tool use; sort Claude, GPT-4, Gemini, Llama.
/model-compare
Convert units online — free, in your browser. Length, weight, temperature, area, volume, and speed simultaneously.
/unit-convert
Compute aspect ratios online — free, in your browser. Missing width or height, simplest integers, and 16:9-style presets.
/aspect-ratio
Compute percentages online — free, in your browser. X% of Y, percent-of, and percent change with step-by-step breakdowns.
/percentage
Evaluate math expressions online — free, in your browser. Recursive-descent parser with no eval; trig, log, and constants.
/expression
Compute statistics online — free, no upload. Mean, median, mode, std dev, variance, and percentiles from pasted numbers.
/statistics
Check WCAG contrast ratios online — free, in your browser. AA and AAA results for normal text, large text, and UI components.
/contrast
Format numbers online — free, in your browser. Locale-aware standard, scientific, engineering, and compact notations.
/number-format
Check primes online — free, in your browser. Factors, factorization, prime lists up to a limit, and the nth prime.
/prime
Compute GCD and LCM online — free, in your browser. Multiple numbers with extended Euclidean algorithm and Bezout coefficients.
/gcd-lcm
Generate Fibonacci sequences online — free, in your browser. Nth term, Fibonacci checks, and the golden ratio.
/fibonacci
Convert numbers between binary, decimal, hex, and octal online — free, no upload. Arbitrary-precision results computed in your browser.
/base
Convert times between any IANA timezone online — free, in your browser. UTC offsets shown side by side.
/timezone
Compute date differences online — free, in your browser. Add or subtract days, weeks, months, or years from any date.
/date-calc
Count working days between two dates online — free, in your browser. Configurable weekends and per-country holiday sets.
/working-days
Format durations online — free, in your browser. Short, long, and clock styles; parse text to seconds and milliseconds.
/duration
Convert dates between ISO 8601, RFC 2822, Unix, and locale formats online — free, in your browser.
/iso-date
Convert Unix timestamps to readable dates online — free, no upload. Supports seconds, milliseconds, and UTC, live as you type.
/timestamp
Build cron expressions online — free, in your browser. Validate schedules with a human-readable description and common presets.
/cron
Parse User-Agent strings online — free, no upload. Browser, OS, device type, and bot classification detected.
/ua-parser
Analyze HTTP response headers online — free, no upload. Descriptions, categories, and security notes for every header.
/header-analyzer
Validate IPv4 addresses online — free, in your browser. Classify and convert between binary, hex, decimal, and dotted-decimal.
/ip-utils
Look up MAC address vendors online — free, in your browser. Committed IEEE OUI registry, any address format, prefix search.
/mac-lookup
Browse a DNS record reference online — free, in your browser. A, AAAA, CNAME, MX, TXT, SRV, CAA and more with format and TTL notes.
/dns-ref
Parse and inspect URLs online — free, no upload. Encode and decode query parameters, path segments, and protocol components.
/url
Browse HTTP status codes with descriptions and use cases online — free, in your browser. Every class from 1xx through 5xx.
/http-status
Search MIME types by extension or type online — free, in your browser. Common web, document, and media types with details.
/mime
Generate CORS configurations online — free, in your browser. Nginx, Apache, Express, ASP.NET, and Cloudflare Workers from one form.
/cors
Compute CIDR subnets online — free, in your browser. IPv4 range, broadcast, host count, and mask conversion.
/cidr
Build curl commands interactively online — free, in your browser. HTTP methods, headers, body, auth, and flags with live preview.
/curl
Explain regular expressions token by token online — free, no upload. Anchors, groups, quantifiers, and classes visualized.
/regex-explain
Browse a library of common regex patterns online — free, in your browser. Email, URL, phone, dates, UUIDs, and more; copy and test.
/regex-lib
Convert glob patterns to regex online — free, in your browser. Test against paths; supports *, **, ?, and character classes.
/glob-regex
Test regular expressions online — free, no upload. Live matches with capture groups and flags, plus a JavaScript and PCRE reference.
/regex
Browse a regex syntax reference online — free, in your browser. Character classes, anchors, quantifiers, and groups explained.
/regex-ref
Check regex for ReDoS risk online — free, no upload. Flags catastrophic backtracking with suggested safe rewrites.
/redos-check
Build regex from labeled examples online — free, in your browser. Match and no-match strings yield ranked candidates with test table.
/text-to-regex
Generate regex sample strings online — free, in your browser. Literals, classes, quantifiers, groups, and alternation covered.
/regex-samples
Convert HEX, RGB, and HSL colors online — free, in your browser. Pick any color and copy every format instantly.
/color
Generate color palettes online — free, in your browser. Complementary, analogous, and triadic sets from any base color.
/color-palette
Convert colors between HEX, RGB, HSL, and OKLCH online — free, in your browser. All common input syntaxes at once.
/color-convert
Browse all 148 W3C CSS color names online — free, in your browser. HEX, RGB, and HSL values, searchable and click-to-copy.
/color-names
Browse the Tailwind v3 color palette online — free, in your browser. 22 families, shades 50–950; click to copy HEX or classes.
/tw-colors
Browse ANSI terminal color codes online — free, in your browser. Foreground and background codes with a live escape preview.
/ansi-colors