Utilier is a free collection of 133+ online developer, DevOps and cloud tools including formatters, converters, encoders, decoders, validators and generators. Tools run locally in your browser where applicable, so technical data stays private.

Is Utilier free to use?

Yes, all tools are completely free with no signup required. There are no usage limits and all processing happens locally in your browser for maximum privacy.

Does Utilier store my data?

No. All tools run client-side in your browser. Your data never leaves your device. There is no server-side processing of your input data.

Developer, DevOps & Cloud Tools

133+ free online tools for web development, APIs, security, DevOps, CloudOps and everyday technical tasks. Utilier is fast and privacy-friendly, with tools that run locally in the browser where applicable.

Why Utilier?

No tracking — Use technical tools without behavioral tracking.
No Signup Required — Use any tool instantly without creating an account.
Privacy-friendly — Tools run locally in the browser where applicable.
Fast — Lightweight utilities for repeated development, DevOps and CloudOps tasks.

Browse all categories or explore technology tags.

Formatters Tools

JSON Beautifier & Validator — Format, minify and validate JSON. Reports the exact error location.
HTML Beautifier & Minifier — Indent or minify HTML. Content of pre/script/style is preserved.
CSS Beautifier & Minifier — Pretty-print or minify CSS. Handles comments, strings, and nested at-rules.
JavaScript Beautifier & Minifier — Format, minify, or obfuscate JavaScript. String, template, regex and comment aware.
SQL Formatter — Format SQL queries: clauses on new lines, keywords uppercased.
Markdown Preview — Live GitHub-flavoured-ish Markdown rendering (safe, HTML-escaped).
Diff Checker — Compare two texts line by line with additions and deletions highlighted.
XML Beautifier / Minifier — Pretty-print, minify, validate XML. Convert to JSON or CSV.
Markdown Writer — Write markdown with a quick-action toolbar. Preview as rendered HTML, copy or download in multiple formats.

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

Base64 / Base32 / Base58 / Base85 Encoder — Encode and decode text using Base64, Base32, Base58, Base85, or ASCII85.
URL Encode / Decode — Percent-encode or decode text and query components, in any character set.
HTML Entity Encode / Decode — Escape/unescape HTML special characters and numeric entities.
ROT13 / ROT-N Encoder — Apply the ROT13 letter cipher (or any ROT-N shift) to text. ROT13 is its own inverse.
JWT Decoder — Decode a JWT's header and payload. Optionally verify an HMAC signature.
JWT Generator — Create a signed JWT (HS256/384/512) from a JSON payload and secret.
Unicode Encoder / Decoder — Convert text to and from \uXXXX escapes, or list its Unicode code points.
UTF-8 Encoder / Decoder — Convert text to its UTF-8 bytes (hex, decimal or binary) and decode bytes back to text.
Escape / Unescape — Escape and unescape strings for JSON, XML, JavaScript, CSV, and SQL contexts.
Image ↔ Base64 — Convert images to Base64 data URIs, or paste a data URI to preview and download the image. Max 2MB.

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

JSON & HAR Secret Redactor — Redact likely secrets, authorization headers, and email addresses locally before sharing data.
Unicode Security Inspector — Find invisible Unicode, bidi controls, mixed scripts, and common confusable characters locally.