Developer Tools118
Free, fast, and private. All tools run entirely in your browser — no data is ever sent to a server.
JSON Formatter & Validator
Format, validate, and beautify JSON data instantly. Supports minification, tree view, and error detection.
Code FormattingBase64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text. Supports UTF-8 and binary data.
Encoding & DecodingURL Encoder / Decoder
Encode and decode URL components. Supports encodeURIComponent and encodeURI modes.
Encoding & DecodingHTML Entity Encoder / Decoder
Convert HTML special characters to entities and back. Prevent XSS and display code safely.
Encoding & DecodingHex ↔ Text Converter
Convert text to hexadecimal byte representation and hex strings back to readable text.
Encoding & DecodingBinary ↔ Text Converter
Convert text to 8-bit binary representation and decode binary strings back to text.
Encoding & DecodingNumber Base Converter
Convert numbers between decimal, hexadecimal, binary, and octal bases simultaneously.
Encoding & DecodingUnicode Escape / Unescape
Convert text to Unicode escape sequences (\uXXXX) and back. Inspect character code points.
Encoding & DecodingROT13 Cipher
Apply the ROT13 substitution cipher — shifts each letter by 13 positions. Apply twice to reverse.
Encoding & DecodingMorse Code Translator
Translate text to International Morse Code and decode Morse back to text.
Encoding & DecodingHTTP Request Builder
Build HTTP requests visually with method, URL, headers, and body. Generate fetch(), cURL, and Axios code.
API & NetworkcURL to Fetch Converter
Convert cURL commands to JavaScript fetch(), Axios, or Node fetch code instantly.
API & NetworkHTTP Status Code Reference
Searchable reference of all HTTP status codes with descriptions and common use cases.
API & NetworkHTTP Header Parser
Parse and analyze raw HTTP headers into a structured table with descriptions for each header.
API & NetworkJSON Schema Validator
Validate JSON documents against a JSON Schema. Supports type, required, properties, min/max, enum, and pattern.
API & NetworkQuery String Parser & Builder
Parse URL query strings into key-value pairs, or build query strings from parameters with URL encoding.
API & NetworkHash Generator (MD5, SHA-1, SHA-256, SHA-512)
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text using the Web Crypto API. 100% client-side.
Security & CryptoJWT Decoder
Decode JSON Web Tokens (JWT) to inspect header, payload, and expiration status. No verification — just decoding.
Security & CryptoUUID Generator
Generate RFC 4122 compliant UUID v4 (random) identifiers. Batch generate up to 100 at once.
Security & CryptoPassword Generator
Generate cryptographically strong random passwords with customizable length and character sets.
Security & CryptoHMAC Generator
Compute HMAC (Hash-based Message Authentication Code) using SHA-256, SHA-512, or SHA-1 with the Web Crypto API.
Security & CryptoRSA Key Pair Generator
Generate RSA public/private key pairs (2048 or 4096 bit) in PEM format using the Web Crypto API.
Security & CryptoPassword Strength Checker
Analyze password strength by checking length, character diversity, common patterns, and entropy.
Security & CryptoTOTP Code Generator
Generate Time-based One-Time Passwords (TOTP) from a Base32 secret. Compatible with Google Authenticator.
Security & CryptoPEM / Certificate Decoder
Decode PEM-encoded certificates, public keys, and private keys. Shows type, size, and hex dump.
Security & CryptoRandom Bytes Generator
Generate cryptographically secure random bytes in hex, Base64, or decimal array format.
Security & CryptoJSON Diff Checker
Compare two JSON objects and highlight differences — added, removed, and changed keys. Works recursively on nested objects.
Code FormattingXML Formatter
Pretty-print XML with proper indentation or minify it. Validates XML structure and handles nested elements.
Code FormattingHTML Formatter
Beautify HTML with proper indentation or minify for production. Handles self-closing tags and nested elements.
Code FormattingCSS Formatter
Beautify CSS with one property per line and proper indentation, or minify by removing whitespace and comments.
Code FormattingJavaScript Formatter
Beautify JavaScript code with proper indentation, line breaks, and spacing. Also minifies by stripping whitespace.
Code FormattingSQL Formatter
Format SQL queries with keyword uppercasing, proper indentation, and line breaks at clause boundaries.
Code FormattingYAML Formatter
Parse and re-format YAML with consistent indentation. Convert between YAML and JSON formats.
Code FormattingMarkdown Preview
Render Markdown to HTML with live preview. Supports headers, bold, italic, lists, code blocks, tables, and more.
Code FormattingJSON → Class Generator
Generate strongly-typed class definitions from JSON. Supports C#, Java, Python, and TypeScript with nested objects.
Code FormattingRegex Tester
Live regex tester with match highlighting, match count, and capture group details. Supports global, case-insensitive, multiline, and dotAll flags.
Regex & DebuggingRegex Replace
Regex-based find and replace with capture group references ($1, $2). Preview replacements before applying them.
Regex & DebuggingRegex Escape / Unescape
Escape special regex characters to create safe literal patterns, or unescape a pattern back to plain text.
Regex & DebuggingRegex Cheatsheet
Interactive, searchable regex reference covering character classes, quantifiers, anchors, groups, lookaheads, and flags.
Regex & DebuggingCSV ↔ JSON Converter
Convert CSV data to JSON arrays and JSON arrays back to CSV. Handles quoted fields and commas in values.
Data ConversionJSON → Table Viewer
Render a JSON array of objects as an interactive, sortable HTML table. Click headers to sort.
Data ConversionXML ↔ JSON Converter
Convert XML to JSON preserving attributes and text nodes, or JSON back to well-formed XML.
Data ConversionYAML ↔ JSON Converter
Convert YAML to JSON and JSON to YAML. Supports nested objects, arrays, and scalar types.
Data ConversionJSON → CSV / TSV Exporter
Flatten nested JSON arrays to CSV, TSV, or pipe-delimited output. Dot-notation for nested keys.
Data ConversionUnit Converter
Convert between data sizes, time, length, weight, and temperature units. Show all conversions at once.
Data ConversionCSS Gradient Generator
Create beautiful CSS gradients visually. Pick colors, set direction or angle, choose linear or radial, and copy clean CSS.
Frontend & UICSS Box Shadow Generator
Generate CSS box shadows with live preview. Adjust offset, blur, spread, color, opacity, and inset options.
Frontend & UICSS Border Radius Generator
Generate CSS border-radius with individual corners or uniform values. Live preview with copy-ready CSS.
Frontend & UIFlexbox Playground
Interactive CSS flexbox playground. Set flex-direction, justify-content, align-items, flex-wrap, and gap with live preview.
Frontend & UIColor Picker & Converter
Convert colors between HEX, RGB, HSL formats. Color picker with alpha support and live swatch preview.
Frontend & UITailwind CSS Class Lookup
Tailwind CSS class reference and lookup. Select utility classes and see equivalent CSS output instantly.
Frontend & UICSS Grid Generator
Generate CSS Grid layouts visually. Set columns, rows, gap, and sizing units with live preview and copy-ready CSS.
Frontend & UIString Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE, and more.
Text UtilitiesString Escape / Unescape
Escape and unescape strings for JSON, HTML, URL, XML, CSV, and Regex contexts. Handles special characters safely.
Text UtilitiesRemove Duplicate Lines
Remove duplicate lines from text, keeping only first occurrences. Supports case-insensitive and whitespace-trimmed comparison.
Text UtilitiesSort Lines
Sort lines alphabetically, reverse, by length, numerically, or shuffle randomly. Supports case-insensitive sorting.
Text UtilitiesWord & Character Counter
Count characters, words, sentences, paragraphs, and lines in real time. Shows reading time and character frequency.
Text UtilitiesSlug Generator
Generate clean, URL-friendly slugs from any text. Strips special characters, normalizes accents, and supports custom separators.
Text UtilitiesText Diff Checker
Compare two blocks of text line-by-line. Highlights additions in green and deletions in red using LCS-based diff.
Text UtilitiesFind & Replace
Find and replace text with support for regex patterns, case-insensitive search, and match highlighting.
Text UtilitiesTimestamp Converter
Convert between Unix timestamps (seconds/milliseconds) and human-readable dates in multiple formats including ISO 8601, RFC 2822, and local time.
Time & DateTimezone Converter
Convert dates and times between 29 global timezones. View all timezones at once or convert between specific zones.
Time & DateCron Expression Parser
Parse standard 5-field cron expressions into human-readable descriptions and see the next 5 scheduled run times.
Time & DateDate Difference Calculator
Calculate the precise difference between two dates in years, months, days, hours, minutes, seconds, total days, weeks, and business days.
Time & DateCountdown Timer
Live countdown to a future date or elapsed time since a past date with progress bar, updating every second.
Time & DateExpression Calculator
Safely evaluate mathematical expressions with support for arithmetic, exponents, functions (sqrt, sin, cos, log), and constants (PI, E).
Math & LogicMath Base Converter
Convert numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) with bit length display.
Math & LogicBitwise Calculator
Perform bitwise operations (AND, OR, XOR, NOT, shifts) on integers with binary visualization and multi-base output.
Math & LogicPercentage Calculator
Calculate percentages with three modes: X% of Y, X is what % of Y, and percentage change from X to Y.
Math & LogicRoman Numeral Converter
Convert between decimal numbers (1–3999) and Roman numerals with validation and subtractive notation support.
Math & LogicASCII Table
Searchable reference of all 128 ASCII characters showing decimal, hex, octal, binary, character, and description.
Math & Logic.gitignore Generator
Generate .gitignore files from popular templates for Node.js, Python, Java, Go, Rust, C#, React, and more. Combine multiple templates with custom entries.
Git HelpersCommit Message Generator
Generate properly formatted Conventional Commits messages with type, scope, body, breaking changes, and issue references.
Git HelpersBranch Name Generator
Generate clean, consistent git branch names following popular naming conventions like feature/TICKET-123-description.
Git HelpersGit Cheatsheet
Interactive, searchable reference of essential git commands organized by category with syntax, descriptions, and examples.
Git HelpersDiff Viewer
Compare two blocks of text line by line with color-coded unified diff output showing additions, removals, and context.
Git HelpersGit Command Builder
Build git commands visually by selecting operations and configuring options via checkboxes and inputs. No need to memorize flags.
Git HelpersMeta Tag Generator
Generate complete HTML meta tags for SEO including title, description, keywords, viewport, charset, and robots directives with a live Google preview.
SEO & WebOpen Graph Preview
Generate Open Graph and Twitter Card meta tags with live previews for Facebook, Twitter/X, and LinkedIn social sharing cards.
SEO & WebRobots.txt Generator
Generate a valid robots.txt file to control search engine crawler access. Add multiple user-agent blocks, allow/disallow rules, crawl-delay, and sitemap.
SEO & WebSitemap XML Generator
Generate a valid XML sitemap with URLs, last modified dates, change frequencies, and priority values to help search engines index your site.
SEO & WebURL Parser
Parse any URL into its components — protocol, hostname, port, pathname, search parameters, and hash. Edit components and rebuild the URL live.
SEO & WebJSON-LD Schema Generator
Generate Schema.org structured data in JSON-LD format. Supports Article, Product, FAQ, HowTo, Breadcrumb, Organization, Person, and Event types.
SEO & WebImage Compressor
Reduce image file size by re-encoding at lower quality using the Canvas API. Output is JPEG for maximum compression.
Image ToolsImage Resizer
Resize images to custom width and height dimensions with optional aspect ratio lock.
Image ToolsImage Format Converter
Convert images between PNG, JPEG, and WebP formats using the Canvas API.
Image ToolsImage to Base64
Convert an image file to its Base64-encoded data URL string, ready to embed in HTML, CSS, or JSON.
Image ToolsBase64 to Image
Decode a Base64-encoded image string and render it as a downloadable image file.
Image ToolsImage Filters
Apply brightness, contrast, grayscale, sepia, blur, invert, and hue rotation filters to images with real-time preview.
Image ToolsImage Cropper
Select a rectangular area on an image by clicking and dragging, then crop to that selection.
Image ToolsLorem Ipsum Generator
Generate classical Lorem Ipsum placeholder text by paragraphs, sentences, or words. Uses traditional Cicero-derived text.
Dev ProductivityRandom Data Generator
Generate random realistic-looking data: names, emails, phones, addresses, dates, IPs, UUIDs, MAC addresses, and hex colors.
Dev ProductivityFake User Profile Generator
Generate complete fake user profiles in JSON format with name, email, username, phone, address, company, and avatar URL.
Dev ProductivityUUID Batch Generator
Generate batches of 1–1,000 UUID v4 identifiers at once. Supports uppercase/lowercase and with/without hyphens.
Dev ProductivityDev Scratchpad
A persistent text scratchpad with multiple tabs that auto-saves to localStorage. Perfect for quick notes and code snippets.
Dev ProductivityPlaceholder Image Generator
Generate placeholder image URLs as inline SVG data URLs or via placehold.co. Custom dimensions, colors, and text.
Dev ProductivityColor Palette Generator
Generate harmonious color palettes based on color theory. Supports complementary, analogous, triadic, tetradic, split-complementary, and monochromatic harmonies.
Dev ProductivityJavaScript Playground
A sandboxed JavaScript execution environment. Write JS code and see console output instantly — supports console.log, warn, and error.
Learning PlaygroundHTML/CSS Live Editor
A split-pane HTML and CSS editor with real-time live preview. Changes update automatically as you type.
Learning PlaygroundJSON Tree Viewer
Parse JSON and view it as an interactive, collapsible tree with color-coded types, path tooltips, and copy-path-on-click.
Learning PlaygroundSorting Algorithm Visualizer
Visualize sorting algorithms step-by-step with animated bars. Bubble, Selection, Insertion, Quick, and Merge sort with stats.
Learning PlaygroundBig-O Complexity Cheatsheet
Interactive Big-O complexity reference for data structures, sorting algorithms, and graph algorithms. Color-coded and searchable.
Learning PlaygroundCode Screenshot Generator
Create beautiful code screenshots for social media and documentation. Supports multiple themes, languages, and font sizes with macOS-style window chrome.
Fun & ViralDeveloper Quotes Generator
Get inspired by famous programming and tech quotes from legends like Linus Torvalds, Dijkstra, Knuth, and more. Copy or share with one click.
Fun & ViralStack Overflow Formatter
Format your code and questions properly for Stack Overflow. Supports code blocks, fenced blocks, inline code, and full question templates.
Fun & ViralTech Buzzword Generator
Generate impressive-sounding tech jargon for your next meeting or pitch. Choose from Architecture, AI/ML, Cloud, Frontend, Backend, and DevOps categories.
Fun & ViralFun Password Strength Checker
Analyze password strength with time-to-crack estimates, keyboard walk detection, common password checks, and detailed pass/fail breakdown.
Fun & ViralDeveloper Excuse Generator
Need an excuse for why the code doesn't work? Generate hilarious developer excuses for bugs, deadlines, meetings, and deployments.
Fun & ViralChmod Calculator
Convert between symbolic (rwxrwxrwx) and numeric (755) Unix file permissions. Interactive checkboxes with common presets.
Math & LogicIP Subnet Calculator
Calculate network address, broadcast, usable hosts, wildcard mask, and binary representation from IP and CIDR.
API & NetworkDocker Command Generator
Build Docker commands visually — run, build, exec, and compose — with ports, volumes, env vars, and more.
Dev ProductivityNginx Config Generator
Generate nginx server block configs for static sites, reverse proxies, load balancers, and SSL redirects.
Dev ProductivityTOML ↔ JSON Converter
Convert between TOML and JSON formats bidirectionally. Parse, validate, and transform configuration files.
Data ConversionAspect Ratio Calculator
Calculate aspect ratios from dimensions, lock ratio mode, common presets (16:9, 4:3), and resolution lookup.
Math & LogicBandwidth Calculator
Calculate file transfer time from size and speed, or find required bandwidth for a target time.
Math & LogicKubernetes YAML Generator
Generate Kubernetes YAML for Deployments, Services, ConfigMaps, Ingress, and PersistentVolumeClaims.
Dev ProductivityGraphQL Query Builder
Visually build GraphQL queries, mutations, and subscriptions with fields, arguments, and variables.
API & NetworkJSONPath Evaluator
Evaluate JSONPath expressions against JSON data in real-time. Supports $, dot, bracket, wildcard, and recursive descent.
Data Conversion