JSON and data
Format, validate, minify, compare and convert structured data for APIs, configuration files and application workflows.
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Explore Tools → Online Developer Tools for Web Development & Everyday Tasks
Free Developer Tools.
Without the busywork.
Fast, free online web development and developer tools for JSON, coding, DNS, SEO, security, images, encoding, data conversion and more. Format, convert, encode, decode, generate, validate and debug.
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View all tools →Popular developer tools
Popular online tools for coding, web development, data, and everyday tasks.
JSON Formatter
↗Format, beautify, validate and inspect JSON online with an easy-to-use JSON formatter for developers, APIs, configuration files and structured data.
JSON Validator
↗Validate JSON online and quickly find syntax errors, invalid characters and formatting problems in JSON data, API responses and configuration files.
JSON Minifier
↗Minify JSON online by removing unnecessary whitespace and formatting characters to create compact JSON for APIs, applications and data transfer.
Base64 Encoder / Decoder
↗Encode and decode Base64 text online for free. Convert text to Base64 or decode Base64 strings for APIs, web development and data processing.
URL Encoder / Decoder
↗Encode and decode URLs and query parameters online. Convert special characters to URL-safe encoding for web development, APIs and HTTP requests.
UUID Generator
↗Generate UUIDs online for free, including random unique identifiers for applications, databases, APIs, sessions, testing and software development.
JWT Decoder
↗Decode JWT tokens online and inspect JWT headers and payload claims directly in your browser without requiring a server-side token decoder.
Hash Generator
↗Generate common cryptographic hashes from text online, including popular hashing algorithms for development, testing, integrity checks and security work.
Regex Tester
↗Test regular expressions online with live matching and pattern inspection. Debug regex patterns and check matches for JavaScript and development projects.
SQL Formatter
↗Format and beautify SQL queries online for improved readability. Clean up SELECT, INSERT, UPDATE and complex database queries instantly.
Unix Timestamp Converter
↗Convert Unix timestamps to readable dates and times online. Convert epoch seconds and milliseconds for APIs, logs, databases and development.
DNS Lookup
↗Perform a DNS lookup online and inspect DNS records such as A, AAAA, CNAME, MX, TXT, NS and SOA for domains and websites.
EXPLORE
Tools organized around your workflow
Find the right tool quickly and get back to what matters
Web Generators
↗Generate QR codes, barcodes, server configs, headers and web infrastructure files.
8 toolsCloud/DevOps
↗Generate Docker, Kubernetes, Git, Linux, CI/CD and networking configurations.
23 toolsTime Tools
↗Convert timestamps, dates, timezones, durations and business days.
10 toolsCalculators
↗Free online calculators for percentages, numbers, ratios, units, storage and dates.
22 toolsSEO Tools
↗Generate and analyze metadata, structured data, URLs, redirects and crawl directives.
14 toolsMarketing Tools
↗Create campaign links, social metadata, business cards and marketing structured data.
10 toolsJSON & Data
↗Format, validate, compare and convert structured data.
11 toolsEncoding & Conversion
↗Encode, decode and convert common data formats.
7 toolsSecurity & Identity
↗JWT, hashes, UUIDs and useful security utilities.
7 toolsCode & Formatting
↗Format, beautify, minify and compare code.
10 toolsText Tools
↗Count, clean, transform, compare and organize text.
10 toolsDeveloper Utilities
↗Everyday utilities for developers and webmasters.
6 toolsDNS & Web
↗DNS, domains, email authentication and web checks.
8 toolsImage Tools
↗Convert, resize, edit, analyze and optimize common image formats.
34 toolsBUILT FOR REAL WORKOne toolkit.
One toolkit.
Hundreds of tiny problems solved.
JSONBase64JWTUUIDRegexDNSSQLURLHashImagesYAMLHTTP
WHY DEVUTILITYKITS
Simple tools. Less friction.
Designed to make everyday developer tasks faster and easier.
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Fast
Clean interfaces focused on getting you to the result with as few clicks as possible.
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Privacy-minded
Tools that can run entirely in your browser are designed to process data locally.
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No account needed
Open a tool and use it. No registration wall for everyday utilities.
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Built for developers
Practical utilities for coding, APIs, web development, DNS and data workflows.
ALL TOOLS
Explore DevUtilityKits
Browse the complete toolkit.
WEBWeb Generators
DEVCloud/DevOps
Docker Compose Generator→Dockerfile Generator→Docker Command Generator→Kubernetes YAML Generator→Kubernetes Resource Calculator→Gitignore Generator→Git Command Generator→Cron Generator→Cron Parser→Chmod Calculator→Linux Permission Calculator→Linux Command Generator→Systemd Service Generator→Environment Variable Generator→CI/CD YAML Generator→GitHub Actions Generator→GitLab CI Generator→Regex Generator→IP Subnet Calculator→CIDR Calculator→IPv4 Converter→IPv6 Converter→DNS Record Generator→
TIMETime Tools
CALCCalculators
Percentage Calculator→Percentage Change Calculator→Percent Difference Calculator→Ratio Calculator→Average Calculator→Mean Calculator→Median Calculator→Sum Calculator→Number Calculator→Decimal Calculator→Binary Calculator→Hex Calculator→Base Calculator→Number Base Calculator→Unit Converter→Unit Conversion Calculator→Data Size Converter→KB MB Converter→MB GB Converter→Bytes Converter→Storage Calculator→Date Calculator→
SEOSEO Tools
MKTMarketing Tools
{ }JSON & Data
⇄Encoding & Conversion
⌁Security & Identity
</>Code & Formatting
AaText Tools
⚙Developer Utilities
DNSDNS & Web
IMGImage Tools
Image Converter→JPG to PNG→PNG to JPG→SVG to PNG→PNG to SVG→WebP Converter→Image Resizer→Image Compressor→Image Cropper→Image Rotator→Image → Base64→Base64 → Image→Image Color Picker→Image Metadata Viewer→EXIF Viewer→EXIF Remover→Image DPI Calculator→Image Aspect Ratio Calculator→Favicon Generator→ICO Converter→Screenshot Cropper→Blur Image→Pixelate Image→Grayscale Image→Image Border Generator→Image Watermark→Image Background Remover→Social Image Resizer→YouTube Thumbnail Downloader→Instagram Image Resizer→Facebook Image Resizer→LinkedIn Image Resizer→Image Size Calculator→Placeholder Image Generator→
DEVELOPER RESOURCES
Practical online tools for the small tasks that slow development down
DevUtilityKits brings frequently needed developer utilities into one browser-based workspace. Instead of installing a separate application for every small task, you can format data, convert values, inspect web configuration, generate snippets and solve common development problems from a single site.
Encoding and conversion
Encode and decode Base64, URLs and other common representations when working with APIs, web applications and data interchange.
Explore encoding tools →SEO and web development
Generate metadata and structured web elements, inspect domains and work through practical technical SEO and website configuration tasks.
Explore SEO tools →Images and media
Resize, compress, convert and optimize common image formats for websites, documentation, applications and content workflows.
Explore image tools →Security and infrastructure
Work with hashes, JWTs, UUIDs, DNS, HTTP, Docker, Kubernetes, Linux and other everyday infrastructure tasks.
Explore security tools →Calculators and time tools
Handle percentages, ratios, units, storage, dates, timestamps, durations and business-day calculations without a spreadsheet.
Explore calculators →Built for developers, webmasters, SEO professionals, learners and technical teams
Small technical tasks appear in almost every project. A developer may need to inspect an API response, format JSON, decode a value, compare text, create a regular expression or check DNS records. A webmaster may need to validate a domain, inspect HTTP headers, generate redirects or prepare structured data. DevOps workflows bring another set of tasks involving Docker, Kubernetes, Linux permissions, cron expressions and configuration files.
DevUtilityKits brings these practical tools together in one place. Each tool has its own focused page, clear instructions and related utilities, making it easy to move from one task to the next without losing context. Whether you're troubleshooting code, working with data, managing a website or completing a quick technical task, you can find a tool designed to help.
Where processing can happen directly in the browser, the interface is designed to keep workflows simple and minimize unnecessary uploads.
For deeper explanations, our developer problem-solving guides explain common tasks step by step and connect each guide to a relevant utility. This creates a useful path from learning a technique to completing the task.
FAQ
Frequently asked questions
Are DevUtilityKits tools free?
Yes. The core online utilities are designed to be free to use.
Do I need an account?
No account is required for normal use of the tools.
Is my data uploaded?
Tools that support client-side processing can process your input directly in your browser. Check the individual tool for its processing behavior.
Can I use the tools on mobile?
Yes. The site is designed to work across desktop, tablet and mobile screens.