Developer Tool Categories

Browse Utilier by task-based categories: formatters, converters, encoders and decoders, generators, validators and testers, security, DevOps and cloud, network and HTTP, text and data, and miscellaneous utilities.

Formatters Tools

Converters Tools

  • SQL Converter — Convert SQL INSERT statements or SELECT results to CSV, JSON, XML, YAML, or HTML.
  • Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates (local & UTC).
  • Timezone Converter — Convert a date and time between any two IANA time zones (DST-aware).
  • Color Picker & Converter — Convert between HEX, RGB(A), HSL(A), HSV, and CMYK. Pick a color visually.
  • cURL Converter — Convert a curl command to fetch, Axios, React, Python, Go, PHP, Java or Rust — and fetch back to curl.
  • JSON ↔ YAML — Convert JSON to YAML and YAML back to JSON.
  • TOML Converter — Convert TOML to JSON or YAML and JSON/YAML back to TOML, with validation.
  • JSON ↔ CSV / SQL — Convert JSON array to CSV, TSV, or SQL INSERT statements. Parse CSV/TSV back to JSON.
  • Case Converter — Convert text between camelCase, snake_case, kebab-case, Title Case and more.
  • Number Base Converter — Convert integers between binary, octal, decimal, hexadecimal, and custom bases (radix 2-36).
  • Text / Binary / Hex / Decimal / Octal Converter — Convert between text, binary, hexadecimal, decimal, and octal. Auto-detects the input format.
  • Slug Generator — Convert titles into clean, URL-friendly slugs. Strips accents and punctuation.
  • CSS Unit Converter — Convert between px, rem, em, %, pt, pc, in, cm, mm, vw and vh.
  • Image Converter — Turn an image into a Base64 data URI, CSS background, <img> tag or an SVG wrapper.
  • ASCII Converter — Convert text to and from character codes in decimal, hexadecimal or binary.
  • Image Resizer & Compressor — Crop, resize an image to exact pixel dimensions and re-encode it at a chosen quality to shrink the file size.
  • Image Cropper — Crop an image with a draggable, resizable selection box. Move it, drag any of the 8 handles, and lock to a fixed aspect ratio or crop freely.
  • SVG Viewer — Paste SVG markup to preview it live and export it as a data URI or PNG.
  • SVG Optimizer & Inspector — Minify SVG markup locally and flag common preview and accessibility gaps.
  • HTML ↔ Markdown Converter — Convert HTML to Markdown and Markdown to HTML. Handles headings, lists, tables, links, images, and code blocks.
  • JSON to TypeScript — Convert JSON objects to TypeScript interfaces. Handles nested objects, arrays, and optional/null fields.

Encoders Tools

Generators Tools

  • Hash Generator — Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512, and CRC-16 digests of text.
  • HMAC Generator — Compute a keyed HMAC signature of a message (SHA-1/256/384/512).
  • CRC32 Generator — Compute the CRC-32 (IEEE 802.3) checksum of text, shown as hex and decimal.
  • Hash Verification — Compute a hash of your text (MD5, SHA-1/256/384/512 or CRC-32) and compare it against an expected value to confirm a match.
  • Checksum Calculator — Upload a file to compute its SHA-1, SHA-256, SHA-384, SHA-512 and CRC-32 checksums for integrity verification.
  • BCrypt Generator — Hash a password with bcrypt (Blowfish-based, salted) at a configurable cost, or verify a password against an existing bcrypt hash.
  • AES Encrypt / Decrypt — Encrypt or decrypt text with AES-256-GCM using a password (PBKDF2-SHA256 key derivation). Output is base64 packing salt + IV + ciphertext.
  • RSA Encrypt / Decrypt — Generate an RSA keypair and encrypt/decrypt short messages with RSA-OAEP (SHA-256). Keys are PEM. Best for small payloads (≈190 bytes at 2048-bit).
  • UUID Generator — Generate cryptographically-random version 4 UUIDs in bulk.
  • Password Generator — Generate strong random passwords with configurable character sets.
  • QR Code Generator — Turn text/URLs into a QR code, optionally with a centered logo. Download as PNG.
  • Lorem Ipsum Generator — Generate placeholder text by paragraphs, sentences or words.
  • Nano ID Generator — Generate compact, URL-safe unique IDs with a configurable size and alphabet.
  • ULID Generator — Generate ULIDs — 128-bit, lexicographically sortable IDs (48-bit time + 80-bit randomness) in Crockford Base32, with an optional monotonic mode.
  • Random Number Generator — Generate cryptographically-random integers, decimals, primes, or fractions within a range.
  • Random String Generator — Generate random strings from selectable character sets, or special formats (hex, binary, MAC address).
  • Random Regex Generator — Generate random strings that match a regular expression pattern. Perfect for test data generation.
  • ASCII Art Generator — Turn text into a figlet-style banner or convert an image into ASCII art. Copy, download as text or image, and share.
  • Snowflake ID Generator — Generate and decode Twitter/Discord-style Snowflake IDs with a configurable epoch and bit layout.
  • CSS Gradient Generator — Design linear or radial gradients with live preview and copy the CSS.
  • Box Shadow Generator — Visually build a CSS box-shadow and copy the rule.
  • CSS Grid & Flexbox Generator — Generate CSS Grid templates or Flexbox layouts with a live preview, then copy or download the CSS.
  • Cron Expression Generator — Build a cron expression from simple schedule fields with a live description.
  • Regex Generator — Pick a common validation pattern and test it against sample text.
  • Barcode Generator — Generate a Code 128 barcode from text and export it as PNG.
  • Favicon Generator — Create favicon PNGs from a letter or emoji with custom colors, in every common size.
  • Fake Data Generator — Generate mock people or products (JSON/XML/CSV) or placeholder images (PNG/JPG/WEBP/GIF) for prototyping.
  • CSS clamp() Fluid Scale Generator — Generate a responsive CSS clamp() value from minimum and maximum viewport and size targets.
  • CSS Animation Generator — Create CSS animations with live preview. Adjust timing, pick presets, upload an image to test. Copy the generated CSS.

Utilities Tools

  • Text Compression — Compress and decompress text using GZip, Deflate, or Deflate-Raw algorithms.
  • Regex Tester — Test JavaScript regular expressions with live match highlighting and groups.
  • Date Difference Calculator — Calculate the elapsed time between two dates as a calendar breakdown and in total units.
  • Word & Character Counter — Live count of words, characters, lines, sentences, paragraphs and reading time.
  • Text Formatter & Cleaner — Clean up text: remove blank lines, trim spaces, strip line numbers, sort/shuffle/reverse lines or words, remove punctuation, flip upside down.
  • Advanced String Tools — Advanced string manipulation: remove accents, extract delimited text, filter lines, calculate similarity, character diff.
  • Emoji Picker — Browse and click an emoji to copy it to your clipboard.
  • UUID Validator — Check whether a string is a valid UUID and detect its version and variant.
  • Query Parameter Parser — Break a URL or query string into its individual parameters.
  • Query String Builder — Assemble a URL-encoded query string from key/value pairs.
  • Cron Expression Parser — Translate a cron expression into a plain-English schedule.
  • Clipboard History — The last 10 things you copied from any tool. Click to copy again.
  • HTTP Status Codes — Searchable reference of HTTP response status codes with their names and meanings.
  • Keyboard Event Tester — Inspect key events (key, code, keyCode, modifiers) and browse the ASCII chart with code↔character conversion.
  • Developer Calculator — Evaluate math expressions with functions (sqrt, sin, cos, log), constants (pi, e), operators (^, %, /), and bitwise operations (and, or, xor, not, shl, shr).
  • CSS Specificity Calculator — Compare CSS selectors locally and see the cascade specificity tuple.
  • Regex Extractor — Extract every regex match and capture group with locations, then export JSON or CSV locally.
  • Cron Expression Explainer — Explain five-field cron schedules and preview the next 10 runs in a selected timezone.
  • Unit Converter — Convert between units of length, weight, temperature, area, volume, speed, time, data size, and pressure.
  • JSONPath Query — Query JSON data using JSONPath expressions ($, dot notation, arrays, wildcards, recursive descent).
  • JSON Schema Validator — Validate JSON locally against a practical JSON Schema subset and see precise field-level errors.
  • Cheat Sheets — Instant-search reference cards for git, docker, kubectl, terraform, vim, bash, and regex. Click any command to copy.
  • HTML Table Generator — Visual table builder — set rows and columns, fill in data, generate clean HTML table code.
  • Credit Card Validator — Validate card numbers using the Luhn algorithm. Identifies card type (Visa, Mastercard, Amex, Discover, etc.).

Config Tools

  • robots.txt Generator — Generate a robots.txt with allow/disallow rules, crawl-delay and sitemap.
  • sitemap.xml Generator — Turn a list of URLs into a valid XML sitemap.
  • .gitignore Generator — Combine common .gitignore presets for languages, OSes and editors.
  • Dockerfile Generator — Scaffold a Dockerfile for many stacks with multi-stage builds, env vars, ports, a non-root user and healthcheck.
  • .htaccess Generator — Generate common Apache .htaccess rules (HTTPS, www, caching, compression).
  • Server Config Generator — Generate nginx, Apache or Tomcat configs for HTTPS, reverse proxy, load balancing, API gateway, caching and rate limiting.
  • Nginx Config Generator — Generate production-ready Nginx server blocks for reverse proxy, SPA, or static sites with SSL, gzip, and security headers.
  • Web Manifest Validator — Validate a PWA web manifest locally and inspect essential install metadata.
  • .env Parser & Converter — Validate environment variables locally and convert .env entries to JSON or Docker Compose YAML.

Network Tools

  • CIDR Calculator — Expand an IPv4 CIDR block into network, broadcast, host range and mask.
  • Subnet Calculator — Enter an IP and a subnet mask (dotted or prefix) to compute the subnet details.
  • IP Address Converter — Convert IPv4 addresses to and from decimal, hexadecimal, octal, and binary formats.
  • Punycode Converter — Convert internationalized domain names (IDN) to and from Punycode (xn--) ASCII form.
  • CSP Generator & Evaluator — Build a Content-Security-Policy from directives and lint any pasted CSP for common weaknesses.
  • SSL/TLS Certificate Decoder — Decode PEM-encoded X.509 certificates — view subject, issuer, validity, SAN, and expiration status.
  • OpenAPI / Swagger Viewer — Browse an OpenAPI/Swagger document's endpoints and schemas in a readable list — paste JSON or YAML, entirely offline.
  • OpenAPI to cURL Inspector — Convert OpenAPI/Swagger JSON operations into ready-to-run cURL request starters — a lightweight inspector, not a full spec browser.
  • Cookie Parser & Set-Cookie Builder — Parse Cookie and Set-Cookie values, then build a standards-friendly response header locally.
  • HAR File Analyzer — Inspect a browser HAR capture locally: slow requests, failures, domains, and transfer size.
  • HTTP Header Analyzer — Parse HTTP headers locally and identify caching, CORS, cookie, and security-header concerns.
  • API Tester — Lightweight REST, GraphQL & WebSocket client with auth, body types, query params, and request history.

DevOps/CloudOps Tools

  • Kubernetes Manifest Generator — Generate a Kubernetes Deployment + Service manifest (image, replicas, ports, env vars) as YAML.
  • Docker Compose Generator — Build a docker-compose.yml with a primary service plus optional Postgres, MySQL, Redis or Mongo add-ons.
  • Terraform (AWS) Generator — Generate Terraform HCL for common AWS resources: EC2 instance, S3 bucket or security group.
  • GitHub Actions Generator — Generate a CI workflow (.github/workflows/ci.yml) for Node, Python, Go, Java or Rust with push/PR triggers.
  • AWS IAM Policy Generator — Generate AWS IAM policy JSON documents with common actions for S3, EC2, Lambda, DynamoDB, and more.
  • GitLab CI Generator — Generate .gitlab-ci.yml pipeline configurations for Node.js, Python, Docker, Terraform, and Go projects.
  • Helm Chart Generator — Generate Kubernetes Helm chart scaffolding (Chart.yaml, values.yaml, deployment template) with configurable options.
  • Dockerfile Linter — Lint Dockerfiles offline — checks for best practices like pinned tags, apt cleanup, COPY vs ADD, exec-form CMD, and more.
  • Terraform Backend Config — Generate Terraform backend configuration for S3, GCS, Azure, Consul, or local state storage with provider setup.
  • Kubernetes Policy Checker — Analyze Kubernetes YAML offline for risky security settings, mutable images, missing resources, and production-readiness gaps.
  • Terraform Static Analyzer — Scan Terraform HCL offline for risky AWS patterns such as public admin ingress, unencrypted storage, missing provider pins, and static credentials.
  • IAM Policy Risk Analyzer — Review AWS IAM policy JSON offline for wildcard permissions, broad resources, escalation-sensitive actions, and risky trust patterns.
  • Architecture Diagram Generator — Create Mermaid architecture diagrams offline from service and dependency lists for system design, DevOps handoffs, and runbooks.
  • Incident Runbook Builder — Generate practical incident response runbooks offline with triage, diagnosis, rollback, communication, validation, and follow-up sections.
  • SLO Error Budget Calculator — Calculate availability, allowed downtime, error budget consumption, remaining budget, and burn rate for SRE and operations planning.
  • Kubernetes YAML Generator — GUI wizard to generate production-ready Kubernetes manifests: Deployment, Service, Ingress, ConfigMap, Secret, PVC, HPA.

Database Tools

  • SQLite Viewer — Open a .sqlite/.db file in the browser, browse tables and run SQL — fully client-side.

Security Tools

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