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A focused, browser-only toolkit for the work between writing code: format, inspect, convert, generate, and get back to building.
✓ 80 focused utilities✓ No sign-up✓ Your data stays local
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{}JSON FormatterFormat, validate, and minify JSON data.›.*Regex PlaygroundTest patterns with live matches and groups.›↗URL Encode / DecodeEncode or decode URL components safely.›
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{}JSON FormatterFormat, validate, and minify JSON data.Data›.*Regex PlaygroundTest patterns with live matches and groups.Text›↗URL Encode / DecodeEncode or decode URL components safely.Web›⌁URL ParserInspect protocol, host, path, and parameters.Web›?Query String ParserTurn URL parameters into readable JSON.Web›◇JWT DecoderInspect token headers and payloads locally.Security›⌘SHA-256 HashCreate a cryptographic checksum locally.Security›✦Password GeneratorCreate strong random passwords in-browser.Security›#UUID GeneratorGenerate v4 UUIDs in batches.Data›⋮Random String GeneratorGenerate random hexadecimal strings.Data›◷Timestamp ConverterConvert Unix timestamps and ISO dates.Time›◴Cron ExplainerUnderstand standard five-part cron expressions.Time›64Base64 StudioEncode strings to Base64 without uploads.Data›◉Data URL GeneratorTurn text into a portable data URL.Web›⇣CSV to JSONConvert simple CSV rows to JSON objects.Data›⇡JSON to CSVExport JSON arrays as spreadsheet-ready CSV.Data›⇄Text DiffCompare two snippets, line by line.Text›AaCase ConverterConvert text to camel, snake, kebab, and more.Text›/Slug GeneratorCreate clean URL slugs from text.Text›≡Text StatisticsCount characters, words, lines, and reading time.Text›</>HTML Escape / UnescapeSafely encode or decode HTML entities.Web›<>HTML Parser & CSS SelectorParse HTML locally and test CSS selectors.Web›U+Unicode InspectorSee code points for every character.Text›◐Color ConverterConvert HEX colors to RGB and HSL.Web›↔CSS Unit ConverterConvert px values into rem and em.Web›▤SQL FormatterMake compact SQL queries easier to read.Data›¶Lorem Ipsum GeneratorGenerate placeholder text for interfaces.Text›TSJSON to TypeScriptInfer TypeScript interfaces from JSON samples.Data›Y:JSON ↔ YAMLConvert configuration data between JSON and YAML.Data›<>JSON ↔ XMLConvert structured JSON and XML locally.Data›MDMarkdown PreviewWrite Markdown and preview safe rendered HTML.Text›▧Image to Base64Create data URIs from local image files.Web›▦QR Code GeneratorGenerate a downloadable QR code for text or URLs.QR›⚿.env → K8s SecretTurn environment variables into Kubernetes Secret YAML.Security›rwxChmod CalculatorTranslate Linux numeric and symbolic permissions.Security›1,0CSS SpecificityCalculate the specificity of a CSS selector.Web›\\String Escape / UnescapeEscape strings for JavaScript, JSON, HTML, and XML.Text›T:JSON ↔ TOMLConvert structured configuration between JSON and TOML.Data›▣Docker Run → ComposeTurn common docker run commands into Compose YAML.Web›⌁cURL → Fetch / AxiosGenerate browser request code from a cURL command.Web›IPIPv4 Subnet CalculatorCalculate network, range, mask, and usable hosts from CIDR.Web›200HTTP Status CodesLook up common HTTP response codes and their meaning.Web›UAUser-Agent ParserIdentify browser, operating system, and device from a user agent.Web›AISKILL.md ValidatorValidate Agent Skills frontmatter and instructions locally.AI›T#Prompt Token CounterEstimate prompt size and context use without sending text anywhere.AI›{{}}Prompt Template TesterRender {{variables}} and find missing prompt values.AI›RAGRAG Text ChunkerSplit text into retrieval-ready chunks with overlap.AI›JLJSONL Dataset ValidatorValidate JSON object lines for datasets, evals, and batches.AI›{}Structured Output ValidatorCheck LLM JSON output against a JSON Schema locally.AI›MCPMCP Config ValidatorInspect MCP server configurations without exposing values.AI›ƒ()AI Tool Schema BuilderGenerate a JSON Schema for LLM tool-call arguments.AI›↳Agent Trace ViewerSummarize messages, tool calls, and results from agent traces.AI›!Prompt Injection CheckerFlag common instruction-override patterns heuristically.AI›MDMarkdown to RAG JSONLSplit Markdown sections into metadata-rich JSONL chunks.AI›$.JSON Path QueryExtract a value from JSON with dot paths and array indexes.Data›↕JSON Flatten / UnflattenConvert nested JSON into key paths and back.Data›⇄JSON Transform KeysKeep, remove, or rename keys in JSON objects.Data›A-ZJSON Key SorterRecursively sort JSON object keys for cleaner diffs.Data›≠JSON CompareCompare two JSON documents while ignoring object key order.Data›J:AJSON:API WorkbenchValidate JSON:API 1.1 documents, compound linkage, errors, links, and media headers.Data›GGoogle SERP PreviewPreview a page title, URL, and description in a Google-style result.SEO›<M>Meta Tag GeneratorGenerate title, description, canonical, robots, and social meta tags.SEO›✓Meta Tag AnalyzerCheck pasted HTML source for essential search and social metadata.SEO›OGOpen Graph & Twitter PreviewPreview social card content and generate sharing tags.SEO›{}Schema JSON-LD GeneratorCreate Article, Product, or LocalBusiness structured data.SEO›/Robots.txt Generator & ValidatorWrite, inspect, and copy crawler rules and sitemap references.SEO›XMLXML Sitemap Generator & ValidatorGenerate a URL sitemap from a simple page list and verify its shape.SEO›NEWSNews Sitemap GeneratorGenerate a Google News sitemap from article details.SEO›WiWi-Fi QR CodeLet guests join a Wi-Fi network with one scan.QR›VCvCard QR CodeCreate a contact card QR code for phones to save.QR›@Email QR CodeOpen a pre-filled email with recipient, subject, and message.QR›SMSSMS QR CodeStart a text message with a number and ready-to-send message.QR›⌖Location QR CodeShare map coordinates as a scan-to-open location.QR›◷Event QR CodeCreate a scan-to-add calendar event QR code.QR›⌕QR Code ScannerRead a QR code from a local image when your browser supports it.QR›H:HTTP Headers InspectorParse request or response headers and surface common delivery details.Web›CSPContent Security Policy BuilderBuild a practical CSP header and spot common policy risks.Security›git.gitignore GeneratorCombine clean ignore rules for common project environments.Web›MIMEMIME Type LookupFind a common Content-Type from a filename or extension.Web›0xText ↔ HexEncode UTF-8 text as hexadecimal bytes or decode it locally.Data›
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