Developer tools
40 free tools, all running in your browser. Encode, decode, format, hash and inspect — the everyday utilities.
- Base64 Encode / DecodeType in either box — plain text encodes to Base64 and Base64 decodes back to text, live as you type.
- Base64 to ImagePaste a base64 string or a full data URI below — the decoded image appears instantly with its format, dimensions, and file size.
- Bitwise CalculatorPerform AND, OR, XOR, NOT and bit shifts on decimal, hex or binary values with an aligned binary view.
- CSS border radius generatorShape corners with sliders, switch to blob mode for organic shapes, and copy the live border-radius CSS.
- CSS box shadow generatorAdjust offsets, blur, spread and color, stack multiple shadow layers, and copy the finished CSS.
- Color ConverterPick a color or edit any of the fields below — the other formats update as you type.
- Cron Expression GeneratorBuild a cron schedule with simple selectors, or paste an existing expression to see exactly what it means and when it will run next.
- CSS Clamp CalculatorSet a minimum and maximum font size with the viewport widths where they apply, and get the exact clamp() rule with the math shown step by step.
- CSS grid generatorSet your tracks and gaps, drag across cells to paint named areas, and copy the generated CSS and HTML.
- CSS Minifier & BeautifierCompress CSS by removing comments and whitespace, or reformat compact CSS into readable rules — live, entirely on your device.
- CSV to JSON ConverterPaste CSV data or open a file and get a clean JSON array instantly, right on your device.
- Flexbox playground & generatorExperiment with every flexbox property on live boxes, click an item to fine-tune it, and copy the CSS that reproduces the layout.
- Hash GeneratorType text or pick a file to get its MD5, SHA-1, SHA-256 and SHA-512 checksums.
- HTML Entity Encoder / DecoderType in either box — the other updates live, encoding or decoding as you go.
- HTML Table GeneratorEdit the grid below, adjust the style options, and copy the generated HTML — the code and preview update as you type.
- HTML to Markdown ConverterPaste HTML on the left and get clean, readable Markdown on the right as you type.
- HTTP Status Code LookupType a code or keyword to filter the full list of standard HTTP status codes, and click any entry for details on when it appears and how to fix it.
- JSON Formatter & ValidatorPaste JSON below to validate it as you type, then format or minify it with one click.
- JSON to CSV ConverterPaste a JSON array of objects or open a .json file and get properly quoted CSV instantly, right on your device.
- JSON to Table ViewerPaste a JSON array of objects to see it as a table you can sort, filter and export.
- JSON to XML ConverterPaste JSON on the left and valid XML appears on the right instantly — objects become elements, arrays become repeated elements, and @-prefixed keys become attributes.
- JSON to YAML ConverterPaste JSON on the left and get clean, correctly quoted YAML on the right — everything runs locally in your browser.
- JWT DecoderPaste a JSON Web Token below — the header and payload are decoded live as you type.
- Markdown PreviewType Markdown on the left and watch the rendered preview update as you go.
- Markdown Table GeneratorEdit the grid below — the Markdown pipe table updates live with aligned padding, ready to copy.
- Markdown to HTML ConverterPaste Markdown on the left and get clean, semantic HTML code you can copy or download — converted entirely on your device.
- Neumorphism CSS generatorPick a base color, tune the sliders and shape, and copy the generated soft-UI CSS.
- PX to REM ConverterType a pixel, rem, or em value and the matching unit updates instantly at your chosen base font size.
- Regex TesterType a pattern and a test string to see matches highlighted instantly, with capture groups and positions listed below.
- SQL FormatterPaste any SQL query to get a cleanly indented, uppercase-keyword version instantly — or minify it to a single line.
- IP Subnet CalculatorEnter an IPv4 address and prefix length to see the full subnet breakdown, updated live as you type.
- SVG Wave GeneratorCreate smooth section-divider waves, preview them live, and export the SVG code or file.
- CSS Text Shadow GeneratorAdjust offset, blur and color for one or more shadow layers and copy the resulting text-shadow CSS — the preview updates as you drag.
- Unix Timestamp ConverterConvert between unix timestamps and readable dates in both directions, live as you type.
- URL Encode / DecodeType in either box and the other side updates as you go.
- User Agent ParserYour browser’s user agent is shown and parsed below — or paste any UA string to break it down live.
- UUID GeneratorA fresh v4 UUID is ready below — click it to copy, or generate a batch.
- XML FormatterPaste XML below to validate it and see a cleanly indented version as you type.
- XML to JSON ConverterPaste XML or open a file and watch it turn into readable JSON instantly, entirely on your device.
- YAML to JSON ConverterPaste YAML on the left and get equivalent JSON on the right, converted instantly on your device.
About these developer tools
These are the utilities every developer reaches for and nobody wants to install: encoding and decoding, formatting and validating structured data, converting between formats, generating hashes and identifiers, checking a regular expression against real input.
Running them locally is a practical matter rather than a philosophical one. Pasting a token, a payload or a production configuration into a website that processes it server-side is a genuine disclosure; here the page is static and the work happens in your tab, which you can verify in the network inspector.