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.
Image Resizer
Resize images & format Chrome Web Store screenshots to 1280x800 or 640x400.
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 16 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 16 tools
- String Case ConverterFree online string case converter. Instantly transform text between camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE, Title Case and more with 100% browser privacy.
- Encoder & DecoderFree online encoder and decoder tool. Encode and decode URL percent-encoding, Base64 strings, and HTML entities instantly in your browser with zero server uploads.
- Diff CheckerFree online text diff checker. Compare two text strings, code snippets, or configuration files side-by-side with line and character-level difference highlighting.
- JWT DecoderFree online JWT decoder. Inspect JSON Web Token headers, payload claims, and expiration timestamps safely and privately in your browser with no server transmission.
- Format ConverterFree online data format converter. Convert seamlessly between JSON, XML, YAML, and CSV formats with instant parsing and 100% client-side privacy.
- Number Base ConverterFree online number base converter. Convert numbers between binary, octal, decimal, and hexadecimal with arbitrary-precision arithmetic directly in your browser.
- Code FormatterFree online code formatter and beautifier. Pretty-print or minify JSON, SQL, XML, HTML, and CSS with syntax validation and custom indentation in your browser.
- JSON VisualizerFree online JSON visualizer and tree viewer. Explore deeply nested JSON structures with interactive collapsible nodes, type indicators, and instant JSONPath copying.
- Regex TesterFree online regex tester and pattern debugger. Test JavaScript regular expressions with real-time match highlighting, capture group extraction, and regex flags.
- Markdown PreviewFree online Markdown editor with instant live HTML preview. Supports GitHub-flavored Markdown (GFM), tables, task lists, code blocks, and one-click HTML export.
- Cron ParserFree online cron expression parser. Translate crontab schedules into plain human English, validate cron syntax, and calculate upcoming execution run times.
- GeneratorsFree online developer generator suite. Generate cryptographically secure passwords, UUID v4 identifiers, SHA-256 / MD5 hashes, and lorem ipsum placeholder text.
- Color PickerFree online color picker and palette generator. Convert between HEX, RGB, HSL, and HSV color codes with WCAG contrast ratio analysis and tint/shade swatches.
- Image CompressorFree online image compressor. Compress JPG, PNG, and WebP images to reduce file size without losing quality. 100% private in-browser compression with zero server uploads.
- Image ResizerFree online image resizer. Resize images to custom pixel dimensions or preset ratios (1920x1080, 1200x630, 1280x800). Preserves aspect ratio with letterbox backgrounds.
- PDF Password ToolFree online PDF password remover and encryptor. Unlock password-protected PDFs or encrypt documents with strong password security. 100% client-side WebAssembly with zero uploads.
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.