Private, browser-side utilities

Developer tools that stay on your machine.

Search 25 developer tools. Everything runs locally in your browser.

Search all 25 local tools
Recently usedstored on this device
Password Strength CheckerHTML MinifierURL Parser

Developer tools

Data & Format

JSON FormatterBeautify, minify, and validate JSON.CSV ⇄ JSON ConverterConvert between CSV and JSON with preview, header detection and delimiter support.Markdown PreviewerWrite Markdown and see the rendered HTML live. Export to HTML. Supports CommonMark.YAML ↔ JSON ConverterConvert between YAML and JSON bidirectionally with validation and error highlighting.Text Diff & CompareCompare two text snippets line by line with inline word highlighting and unified diff export.

Encoding

Base64 Encoder / DecoderEncode and decode Base64 strings online.HTML Entity EncoderEncode special characters to HTML entities.URL Encoder / DecoderEncode and decode URL components safely.Number Base ConverterConvert between binary, decimal, hexadecimal, octal and more bases (2-36).

Developer

UUID GeneratorGenerate v4 UUIDs in bulk instantly.Unix Timestamp ConverterConvert Unix timestamps to human-readable dates.URL ParserParse and inspect any URL: protocol, hostname, port, path, query params, fragments.CRON Parser & GeneratorParse CRON expressions and see the next scheduled execution times. Generate and validate CRON syntax.Keycode / Keyboard Event TesterPress any key and instantly see event.key, event.code, keyCode, location, and modifier states.

Security

JWT GeneratorGenerate signed JWT tokens with custom payloads and HMAC secret.JWT DecoderDecode and inspect JWT tokens without sending data.Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-512 hashes.Password GeneratorCreate strong, secure passwords.Password Strength CheckerAnalyze password strength with zxcvbn. See score, crack time, and improvement tips instantly.

Web Development

HTML MinifierMinify HTML by removing comments, whitespace, and unnecessary characters.CSS Formatter & MinifierBeautify and minify CSS code online.Regex TesterTest regular expressions with live matching and explanations.Color ConverterConvert colors between HEX, RGB and HSL. Includes a visual color picker and auto-generated harmonies.Lorem Ipsum GeneratorGenerate placeholder text with words, sentences or paragraphs. Copy-ready for designers and devs.SEO Title & Meta PreviewTest your page title and meta description length. See how they look on Google desktop and mobile.

Frequently 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.

Is 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.