Developer Tools

Browser-native API client — build or paste cURL requests, inspect responses, manage collections, and store everything in IndexedDB. No backend required.

Encrypt and decrypt text with AES-GCM or AES-CBC locally. Passphrase (PBKDF2) or raw keys, custom IV/salt, and portable JSON packages.

Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.

Sort lines alphabetically or by length, remove duplicates, and trim empty lines — locally in your browser.

Convert text to UPPERCASE, lowercase, Title Case, sentence case, camelCase, snake_case, or kebab-case.

Convert colors between HEX, RGB, and HSL with live preview — runs locally in your browser.

Check WCAG 2 contrast ratios between foreground and background hex colors.

Encode special characters to HTML entities or decode entities back to plain text in your browser.

Convert JSON to YAML or YAML back to formatted JSON for configs and API payloads.

Explain standard 5-field cron schedules in plain language.

Generate SHA-1, SHA-256, SHA-384, or SHA-512 digests in your browser with Web Crypto.

Compute HMAC-SHA digests locally with configurable key/message encodings, output formats, and optional timing-safe compare.

Measure download, upload, ping, and jitter in your browser with a real network test — not a simulated result.

Connect to any WebSocket endpoint, send frames, inspect inbound traffic, and debug reconnect behavior — all in your browser.

Connect to a Socket.IO server, emit custom events with JSON payloads, and watch inbound events in a structured log.

Measure WebSocket round-trip time with automated ping loops, live charts, and min/max/avg/p95 statistics.

Subscribe to a WebSocket feed, parse JSON frames on the fly, filter events, and inspect structured payloads in real time.

Calculate IPv4 and IPv6 networks, masks, usable hosts, binary, and prefix splits from CIDR — privately in your browser.

Convert JSON arrays to RFC 4180 CSV (or TSV) with nested flattening, then reverse CSV back to JSON — privately in your browser.

Convert repeating XML records to CSV (or TSV) with nested flattening, then reverse CSV back to nested XML — privately in your browser.

Convert large Excel workbooks (.xls / .xlsx) to CSV and rebuild .xlsx from CSV or TSV — privately in your browser, without uploading.

Beautify, minify, and validate JSON in your browser — private and free.

Decode JSON Web Token header and payload locally — no signature verification.

Build and sign JWTs locally with HS256/384/512 (or unsigned none), claim presets, and editable header/payload JSON.

Generate classic placeholder copy as paragraphs, sentences, or words — plain text or HTML, privately in your browser.

Turn titles and phrases into clean, SEO-friendly URL slugs with kebab-case formatting.

Convert Markdown to HTML and HTML back to Markdown — locally in your browser.

Generate strong random passwords locally with configurable length and character sets.

Generate a downloadable QR code from text or a URL — entirely in your browser.

Generate favicon.ico, PNG favicons, and apple-touch-icon from a logo — free, in your browser, no upload.

Generate iOS and Android app icon PNG sizes from one logo — free, private, in your browser.

Generate 192×192 and 512×512 PWA icons plus manifest starter from a logo — free, in your browser.

Test JavaScript regular expressions against sample text and inspect matches.

Generate OpenSSH Ed25519, RSA, or ECDSA key pairs locally with fingerprints, comments, and PEM/OpenSSH formats — nothing is uploaded.

Generate TOTP and HOTP codes locally with Base32 secrets, algorithm/digits/period controls, skew window, otpauth URI, and QR.

Convert between binary, octal, decimal, hex, and custom radices (2–36) with bit width, endian views, and bitwise operations.

Compare two texts line by line, word by word, or character by character. Highlights additions and deletions privately in your browser.

Percent-encode or decode URL components safely in your browser.

Generate one or many RFC 4122 UUID v4 identifiers with Web Crypto.

Count words, characters, sentences, paragraphs, and estimated reading time — privately in your browser.

Scan text for emails, phone numbers, SSNs, credit cards, and other personally identifiable information — locally in your browser.