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Essential utilities for software developers. Format, validate, encode, decode, generate, and convert data — all without leaving your browser. Your code and data stay on your device.
67 free tools — all run 100% in your browser
Validate, prettify, and minify JSON data instantly in your browser. No data leaves your device.
Remove emails, phone numbers, and PII from text before pasting into AI tools. Safe AI prompting made easy.
Encode text to Base64 or decode Base64 strings instantly. Useful for API tokens, data URIs, and debugging.
Encode or decode URLs and query parameters. Handle special characters safely for web development.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text. Client-side cryptographic hashing.
Decode and inspect JSON Web Tokens. View header, payload, and signature without any server calls.
Convert XML markup to JSON format instantly. Handles nested elements, attributes, and arrays.
Convert Unix timestamps to human-readable dates and vice versa. Supports multiple timezone formats.
Test regular expressions with real-time highlighting, match groups, and 8 built-in presets for common patterns.
Generate UUID v4, NanoID, ULID, and CUID identifiers. Batch generate up to 50 IDs at once with one click.
Generate strong, random passwords with customizable length, character sets, strength meter, and crack time estimate.
Parse and explain cron expressions in plain English. See the next 5 scheduled run times instantly.
Format and beautify SQL queries with proper indentation. Supports SELECT, JOIN, subqueries, and CTEs.
Convert between decimal, binary, octal, and hexadecimal. View signed/unsigned integer representations.
Generate security headers for your website. Export as Nginx, Apache, Next.js, Express, Vercel, or Cloudflare config.
Explore JSON structure, flatten to dot-notation paths, and query nested values with dot-path syntax.
View CSV data as a sortable, searchable table. Export to JSON or SQL INSERT statements.
Generate SEO meta tags, Open Graph, and Twitter Card markup with live Google and social previews.
Convert JSON data to TypeScript interfaces instantly. Handles nested objects, arrays, optional fields, and union types.
Convert between YAML and JSON formats bidirectionally. Auto-detects input format with instant conversion.
Convert JSON arrays to CSV format with automatic header extraction. Download as .csv file instantly.
Generate JSON Schema (draft-07) from any JSON data. Infers types, required fields, and nested structures automatically.
Generate QR codes from any text or URL. Customize size, error correction, and colors. Download as PNG.
Convert images to Base64 data URIs instantly in your browser. No upload needed — 100% client-side and private.
Calculate Unix file permissions with an interactive checkbox interface. See numeric (755) and symbolic (rwxr-xr-x) notation.
Press any key to instantly see its JavaScript event properties — key, code, keyCode, which, and location.
Interactive HTTP status code reference. Search and browse all status codes grouped by category with descriptions.
Encode special characters to HTML entities or decode HTML entities back to readable text. Supports named and numeric entities.
Preview how your website will appear when shared on social media. See Google, Twitter, and Facebook card previews.
Generate .gitignore files for any project. Select from templates for Node.js, Python, Java, Go, Rust, and more.
Minify HTML by removing comments, whitespace, and unnecessary characters. See original vs minified size and savings percentage.
Minify JavaScript by removing comments, whitespace, and line breaks. See compression stats and copy the result.
Validate JSON with detailed error messages showing exact line and column positions. View deep structure statistics.
Analyze IPv4 and IPv6 addresses. View binary representation, decimal value, address class, and detect private/loopback/reserved ranges.
Format and prettify minified HTML with proper indentation. Choose 2 or 4 space indent. Clean up messy HTML markup.
Format and beautify minified JavaScript with proper indentation, line breaks, and structure.
Escape or unescape backslash sequences in strings. Handle \n, \t, \\, \", \' and more.
Generate random numbers with custom range, count, uniqueness, and sorting options. Includes generation history.
Generate placeholder images in SVG or PNG format. Customize dimensions, colors, and text. Download or copy SVG code.
Optimize SVG files by removing metadata, comments, editor data, and unnecessary attributes. See file size reduction.
Generate HTML tables visually. Edit cells, configure headers, borders, and striped rows. Copy the generated HTML code.
Compare two JSON objects and see added, removed, and unchanged properties. Deep recursive comparison with path display.
Look up DNS records for any domain. Query A, AAAA, CNAME, MX, TXT, and NS records using Cloudflare DNS.
Compare two text documents side by side. View line-by-line diff with additions, removals, and unchanged lines. Copy merged result.
Validate YAML syntax and convert to JSON. Instant error detection with line numbers.
Visual crontab expression builder. Select minute, hour, day, month, and weekday with instant preview and human-readable descriptions.
Create JWT tokens for testing. Edit header, payload, and secret. Color-coded output with structure breakdown.
Analyze password strength with detailed scoring, crack time estimation, and improvement suggestions.
Parse any URL into its components — protocol, hostname, port, path, query parameters, and hash. Copy individual parts.
Resize images in the browser. Set custom dimensions, choose output format (PNG/JPEG/WebP), adjust quality. No upload required.
Create realistic Twitter/X and Instagram post mockups. Customize name, avatar, text, engagement stats. Download as image.
Generate QR codes for WiFi network sharing. Enter SSID and password, customize colors, download PNG. Guests scan to connect.
View hidden EXIF metadata in JPEG images — camera info, GPS location, timestamps. Privacy warning for location data.
Draw your signature on a canvas and download as transparent PNG or SVG. Overlay on PDFs in any editor. 100% private.
Convert CSV data to SQL INSERT statements and back. Auto-generates CREATE TABLE. Supports quoted fields and escaping.
Check if your password has appeared in data breaches. Uses k-anonymity — your full password never leaves your browser.
Write HTML, CSS, and JavaScript and see a live preview instantly. Templates included. Split view or fullscreen preview.
Merge multiple PDF files into one. Drag to reorder. 100% client-side — files never leave your browser.
Split PDF files — extract single pages, page ranges, or every page as individual PDFs. 100% client-side.
Convert JSON to Zod TypeScript schemas. Auto-detects emails, URLs, UUIDs, and dates. Copy-ready output.
Convert docker run commands to docker-compose.yml. Supports 25+ flags including ports, volumes, env vars, networks.
Encrypt and decrypt text with AES-256-GCM. PBKDF2 key derivation, 100% client-side via Web Crypto API.
Compress images to WebP, JPEG, or PNG right in your browser. Adjust quality, resize, batch process — 100% private.
Generate HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512. Hex and Base64 output. Web Crypto API powered.
Calculate percentages instantly — X% of Y, percentage increase/decrease, percentage change between two values.
Convert between bytes, KB, MB, GB, TB and their binary equivalents (KiB, MiB, GiB). SI and IEC units.
Convert length, weight, temperature, speed & volume units. Metric, imperial, and everything in between.
DevUtility Hub offers 67+ free dev tools that run entirely in your browser. Unlike server-based alternatives, your data never leaves your device — making these tools safe for working with production data, API keys, and sensitive information.
Every tool is instant, requires no sign-up, and works offline once loaded. Whether you're a full-stack developer, frontend engineer, DevOps professional, or student — these tools save you time on tasks you do every day.
Server-based tools send your data to remote servers for processing. Client-side tools like ours process everything locally in your browser using JavaScript. This means zero latency, complete privacy, and no risk of data breaches. Your JSON, passwords, tokens, and code never leave your machine.