Private browser-side utilities
Developer tools that stay on your machine.
Format JSON, inspect JWTs, convert colors, generate UUIDs, test regex, and handle everyday dev chores without sending your data anywhere.
devutils://localDeveloper tools
JSON Formatter
Beautify, minify and validate JSON online for free.
Data & FormatBase64 Encoder / Decoder
Encode and decode Base64 strings online.
EncodingUUID Generator
Generate v4 UUIDs in bulk instantly.
DeveloperJWT Generator
Generate signed JWT tokens with custom payloads and HMAC secret.
SecurityJWT Decoder
Decode and inspect JWT tokens without sending data.
SecurityUnix Timestamp Converter
Convert Unix timestamps to human-readable dates.
DeveloperHTML Minifier
Minify HTML by removing comments, whitespace, and unnecessary characters.
Web DevelopmentURL Parser
Parse and inspect any URL: protocol, hostname, port, path, query params, fragments.
DeveloperHTML Entity Encoder
Encode special characters to HTML entities.
EncodingURL Encoder / Decoder
Encode and decode URL components safely.
EncodingCSS Formatter & Minifier
Beautify and minify CSS code online.
Web DevelopmentRegex Tester
Test regular expressions with live matching and explanations.
Web DevelopmentHash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
SecurityPassword Generator
Create strong, secure passwords.
SecurityPassword Strength Checker
Analyze password strength with zxcvbn. See score, crack time, and improvement tips instantly.
SecurityColor Converter
Convert colors between HEX, RGB and HSL. Includes a visual color picker and auto-generated harmonies.
Web DevelopmentCSV ⇄ JSON Converter
Convert between CSV and JSON with preview, header detection and delimiter support.
Data & FormatLorem Ipsum Generator
Generate placeholder text with words, sentences or paragraphs. Copy-ready for designers and devs.
Web DevelopmentNumber Base Converter
Convert between binary, decimal, hexadecimal, octal and more bases (2-36).
EncodingMarkdown Previewer
Write Markdown and see the rendered HTML live. Export to HTML. Supports CommonMark.
Data & FormatCRON Parser & Generator
Parse CRON expressions and see the next scheduled execution times. Generate and validate CRON syntax.
DeveloperYAML ↔ JSON Converter
Convert between YAML and JSON bidirectionally with validation and error highlighting.
Data & FormatKeycode / Keyboard Event Tester
Press any key and instantly see event.key, event.code, keyCode, location, and modifier states.
DeveloperText Diff & Compare
Compare two text snippets line by line with inline word highlighting and unified diff export.
Data & FormatSEO Title & Meta Preview
Test your page title and meta description length. See how they look on Google desktop and mobile.
Web DevelopmentFrequently Asked Questions
Is DevUtils free to use?
Yes. Every tool on DevUtils is completely free to use. There are no hidden fees, no premium tiers, and no usage limits.
Are my data sent to a server?
No. All tools run entirely in your browser using native JavaScript. Your JSON, text, passwords, or files never leave your device — there is no backend server handling your data.
Do I need to create an account?
No account is required. Open the tool, paste your data, and get results instantly. No email, no password, no signup process.
What types of developer tools are available?
DevUtils offers 20+ tools covering JSON formatting, Base64 encoding, UUID generation, JWT decoding, hashing, password generation, color conversion, CSV / JSON / YAML conversion, Markdown preview, CRON parsing, regex testing, HTML / URL encoding, and more.
Can I use DevUtils offline?
Once the page is loaded in your browser, most tools work without an internet connection. Processing is done locally in your browser.