All Tools
61 free online tools, all processed locally in your browser — no sign-up. Use the WebTool search box (⌘K) to find tools by name or keyword.
JSON Tools16 tools
JSON Formatter & ValidatorFree online JSON formatter and validator with inline error hints, collapsible tree view and in-browser processing.JSON MinifierFree online JSON minifier: compress JSON to one line, see live size savings, and validate syntax — processed locally.JSON Escape / UnescapeFree online JSON escape and unescape tool for quotes, newlines and backslashes — fix nested escaping locally.JSON Key SorterFree online JSON key sorter: recursively order object keys alphabetically so semantically identical JSON diffs cleanly.JSON Diff & CompareFree online JSON compare tool: ignores key order, listing added, removed and changed fields by path — all local.JSON to TypeScriptFree online JSON to TypeScript converter: infer interfaces from JSON — nested types, union arrays, optional nulls.JSON to CSV ConverterFree online JSON to CSV converter with RFC4180 escaping, union-field headers, CSV-to-JSON reverse and .csv download.JSON to YAML ConverterFree online JSON and YAML converter with direction auto-detection, clear error line hints and 2-space indent — local.JSON to XML ConverterFree online JSON and XML converter preserving attributes as @_ keys and text nodes, with line-numbered errors — local.JSONPath Query TesterFree online JSONPath tester: extract data from complex JSON with wildcards, recursion, filters and slices in real time.JSON5 ParserFree online JSON5 parser that converts comments, single quotes, unquoted keys and trailing commas into standard JSON.JSON to JavaFree online JSON to Java converter: generate POJOs with Jackson @JsonProperty annotations from sample JSON for Spring.JSON to Go StructFree online JSON to Go converter: generate structs with json tags, PascalCase fields and int64 mapping — go build ready.JSON to PythonFree online JSON to Python converter: generate @dataclass models with type hints, snake_case names and Optional fields.JSON to C#Free online JSON to C# converter: generate classes with JsonPropertyName attributes, PascalCase properties and List<T>.JSON to RustFree online JSON to Rust converter: generate serde structs with derives, snake_case fields, rename attrs and Vec<T>.
Encoding & Decoding5 tools
Base64 Encoder / DecoderFree online Base64 encoder and decoder built on UTF-8 bytes — non-Latin text and emoji round-trip cleanly, all local.URL Encoder / DecoderFree online URL encoder and decoder following RFC3986 percent-encoding, with clear errors for truncated % sequences.Unicode Escape ConverterFree online Unicode escape converter: text to \uXXXX and back, with correct UTF-16 surrogate pairs for emoji.HTML Entity Encoder / DecoderFree online HTML entity encoder and decoder: named, decimal and hex forms, both ways — show code safely, fight XSS.UTF-8 / Hex ConverterFree online UTF-8 to Hex converter: text to hex bytes (中 -> e4 b8 ad) and back, with byte validity checks — local.
JWT Tools1 tools
Crypto & Hash7 tools
MD5 Hash GeneratorFree online MD5 hash generator: type text and instantly get the 32-char hex digest — computed locally in your browser.SHA Hash GeneratorFree online SHA hash tool: compute SHA-1, SHA-256 and SHA-512 hex digests at once to verify downloads — runs locally.HMAC GeneratorFree online HMAC calculator for HMAC-SHA1/256/512: enter key and message to generate a MAC for API signature checks.AES Encrypt / DecryptFree online AES encryption and decryption tool: CBC/ECB modes, Pkcs7/ZeroPadding, Base64/Hex output, keys stay local.RSA Encrypt / DecryptFree online RSA tool: generate 1024/2048-bit PEM key pairs locally, encrypt with public key, decrypt with private key.UUID GeneratorFree online UUID generator: batch-create random v4 or time-ordered v7 UUIDs, uppercase or no-dash, crypto-secure.Random Password GeneratorFree online password generator: 8-64 chars, custom charsets, ambiguous-character exclusion, hex/Base64Url tokens.
Code Formatters5 tools
JS / TS FormatterFree online JavaScript and TypeScript formatter powered by Prettier, with JSX/TSX support and reverse minify — local.CSS FormatterFree online CSS formatter based on Prettier: restore single-line stylesheets to readable indented CSS, or minify.HTML FormatterFree online HTML formatter based on Prettier: re-indent tags, normalize attributes, format embedded script and style.SQL FormatterFree online SQL formatter for MySQL, PostgreSQL, SQL Server and SQLite: uppercase keywords and indented subqueries.XML FormatterFree online XML formatter with two-space indent, preserved attributes, comments and CDATA, plus line-numbered errors.
Text Tools7 tools
Case ConverterFree online case converter: UPPERCASE, lowercase and Title Case modes with line-by-line batch conversion — runs locally.camelCase / snake_case ConverterFree online naming-style converter: camelCase, snake_case, PascalCase, kebab-case, CONSTANT_CASE — batch conversion.Duplicate Line RemoverFree online text dedupe tool: remove duplicate lines keeping first-occurrence order, with ignore-case and trim options.Word & Character CounterFree online word counter: characters, English words, lines, paragraphs, UTF-8 bytes and reading time in real time.Simplified / Traditional Chinese ConverterFree online Simplified-Traditional Chinese converter powered by OpenCC word-level conversion — accurate, fast, local.Remove Empty LinesFree online tool to remove empty and whitespace-only lines while keeping original order and indentation — paste and go.Text Compare (Diff)Free online text compare tool: line-level diff highlights added and removed lines with counts — computed locally.
Time Tools3 tools
Unix Timestamp ConverterFree online Unix timestamp converter: auto-detects seconds/milliseconds, shows local, UTC and ISO 8601 side by side.Date CalculatorFree online date calculator: add or subtract years, months, weeks, days and more, or diff two dates precisely.Crontab Parser & ExplainerFree online crontab parser: translate 5-field cron expressions into plain language and validate ranges before deploy.
Network Tools4 tools
What Is My IPFree online public IP lookup: see your exit IP and browser network info on page load, one-click copy, no logging.IP Geolocation LookupFree online IP geolocation via offline ip2region: country, province, city and ISP, batch queries, no third-party API.User-Agent ParserFree online User-Agent parser: break any UA string into browser, version, OS, device type and engine — local parsing.URL ParserFree online URL parser: split any link into protocol, host, port, path, decoded query params and hash — runs locally.
Image Tools4 tools
QR Code Generator & ScannerFree online QR code generator and scanner: downloadable PNGs from text, links or WiFi info, offline image decoding.Image to Base64Free online image to Base64 converter: drop PNG, JPG, SVG or WebP for a Data URL, or preview and restore from Base64.Image CompressorFree online image compressor: local canvas resampling with quality and size sliders, live compare, JPG/PNG/WebP output.Image Crop & Format ConverterFree online image cropper and format converter: drag to select, lock 1:1, 4:3 or 16:9 ratios, export PNG, JPG or WebP.
Developer Utilities9 tools
Regex TesterFree online regex tester: real-time match highlighting, capture groups, all g/i/m/s/u/y flags and a syntax cheatsheet.Mock Data GeneratorFree online mock data generator: 13 field types (names, phones, emails, UUIDs, IPs), up to 1000 rows, JSON or CSV.Markdown EditorFree online Markdown editor: live side-by-side preview, GFM tables, task lists, code blocks, Mermaid diagram rendering and autosave.JavaScript Online RunnerFree online JavaScript runner: run code in an isolated sandbox iframe with live console capture and timeout protection.YAML Validator & FormatterFree online YAML validator and formatter: real-time checks with line-numbered errors, re-indent and JSON conversion.TOML Validator & FormatterFree online TOML validator and formatter: line-and-column error hints, normalized layout and JSON conversion — local.Code Diff & CompareFree online code compare tool with GitHub-style side-by-side view, inline character highlights and syntax highlighting.Python Online RunnerFree online Python runner powered by Pyodide (CPython in WebAssembly): standard library, live output, code stays local.Online Code Compiler & RunnerFree online compiler for Go, Rust, C, C++ and Java with stdin support, run in an isolated self-hosted sandbox — no setup needed.