Welcome to Strinza.
Clean, distraction-free 100% client-side developer string utilities, converters, code analysis, and media tools.
All Developer Utilities
String Case Lab
Convert text between camelCase, snake_case, PascalCase, and more.
Encoder / Decoder
Encode and decode URLs, Base64, and HTML entities securely.
Diff Checker
Compare strings or imported files with line and word highlights.
JWT Decoder
Inspect JWT header claims, payload data, and token expiration.
Code Formatter
Format, beautify, and minify JSON, SQL, XML, HTML, and CSS.
JSON Visualizer
Interactive collapsible JSON node tree viewer & path copier.
Number Base Converter
Convert between Hexadecimal, Decimal, Binary, and Octal.
Regex Tester
Test regex patterns with live match highlights and presets.
Cron Parser
Parse 5-field cron schedules into plain English text.
Generators
Generate secure passwords, SHA-256 hashes, and Lorem text.
Color Picker
Pick colors, convert HEX to RGB, and inspect palettes.
Image Compressor
Compress JPG and PNG images locally using HTML5 canvas.
PDF Password Tool
Unlock password-protected PDFs or encrypt documents locally.
Recent Activity
Free developer tools that never upload your data
Strinza is a suite of 15 developer utilities that run entirely in your browser. Convert string cases, decode JWTs, diff two config files, beautify minified JSON, test a regular expression, explain a cron expression, compress an image or remove a PDF password without a single byte leaving your machine. There is no account to create, no upload step, no rate limit, no ads and no tracking of what you paste.
Most online utility sites process your input on their servers, which means your API tokens, database dumps, contracts and screenshots pass through infrastructure you do not control. Strinza takes the opposite approach: the page is the application, and the application runs on your device.
Browse all 15 tools
- String Case ConverterFree online case converter. Instantly transform text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case and more. Runs 100% in your browser.
- Encoder & DecoderFree online URL encoder, Base64 encoder/decoder and HTML entity escaper. Encode and decode strings instantly and privately in your browser.
- Diff CheckerFree online text diff checker. Compare two strings side-by-side to highlight line additions, deletions, and modifications with character stats. 100% private.
- JWT DecoderDecode JSON Web Tokens (JWT) online. Inspect header claims, payload data, and expiration status 100% locally in your browser.
- Format ConverterConvert between JSON, XML, YAML and CSV online. Fast, accurate structural conversion that runs entirely in your browser with no uploads.
- Number Base ConverterConvert numbers between binary, octal, decimal and hexadecimal instantly. Free online base converter that works offline in your browser.
- Code FormatterFree online code beautifier for JSON, SQL, XML, HTML and CSS. Format minified code into readable, indented output instantly and privately.
- JSON VisualizerExplore JSON as a collapsible tree. Navigate deeply nested API responses, inspect types and copy paths without scrolling through raw text.
- Regex TesterTest regular expressions against sample text with live match highlighting, capture groups and flag control. Free, private and instant.
- Markdown PreviewWrite Markdown and see rendered HTML side by side in real time. Supports tables, code blocks, task lists and GitHub-flavoured syntax.
- Cron ParserTranslate cron expressions into plain English and preview upcoming run times. Free online crontab parser and schedule validator.
- GeneratorsGenerate secure random passwords, UUIDs, cryptographic hashes and lorem ipsum placeholder text. All generated locally in your browser.
- Color PickerPick colors and convert between HEX, RGB, HSL and HSV. Build palettes and check contrast ratios directly in your browser.
- Image CompressorCompress JPG, PNG and WebP images in your browser. Reduce file size with adjustable quality and no uploads to any server.
- PDF Password ToolAdd or remove password protection from PDF files entirely in your browser. No uploads, no server processing, no stored documents.
Frequently asked questions
Is Strinza free to use?
Yes. Every tool is free with no account, no sign-up, no usage limits and no paywalled features. There are no ads and no affiliate links anywhere on the site.
How is Strinza free if there are no ads?
Because every tool runs entirely in your browser, there are no servers doing the work and almost no running cost. Strinza is a side project maintained for developers rather than a business that needs to monetise your attention or your data.
Is my data sent to a server?
No. Every conversion, diff, decode and compression step is computed in JavaScript or WebAssembly inside your browser tab. Nothing you paste or upload is transmitted, logged or stored, which makes Strinza safe for internal tokens, config files and customer documents.
Do the tools work offline?
Once a page has loaded, the tools keep working without a network connection because all processing is local. Strinza can also be installed as a progressive web app from your browser menu.
Which tools does Strinza include?
Strinza bundles a string case converter, URL and Base64 encoder, text diff checker, JWT decoder, format converter, number base converter, code formatter, JSON visualizer, regex tester, Markdown preview, cron parser, password and hash generators, color picker, image compressor and a PDF password tool.