Kostenlose Online-Entwickler-Tools

lower, UPPER, camelCase, PascalCase, snake_case, CONSTANT_CASE, Train-Case.

Decode hex (with or without separators) back to UTF-8 text.

Sort, reverse, shuffle lines; optional line numbers — all client-side.

Generate placeholder paragraphs with adjustable length.

UTF-8 bytes to space-delimited hex.

Convert Unix seconds or milliseconds ↔ ISO 8601 dates in local and UTC.

Generate RFC 4122 v4 UUIDs with one click — copy individually or all at once.

Trim lines, collapse spaces, or strip all whitespace.

Count words, characters, and lines as you type — Unicode-aware.

SEO-friendly URL slugs from titles — lowercase, hyphenated.

Decode percent-encoded strings to readable text.

Percent-encode or decode query strings and path components safely in the browser.

Percent-encode text for safe use in URLs and query strings.

Inspect scheme, host, path, query, and hash with the URL API.

Decode HTML entities back to characters.

Encode text to numeric / named HTML entities.

Escape &, <, >, quotes for safe embedding in HTML.

Pretty-print HTML with js-beautify for readability.

Remove extra whitespace and shrink HTML for production.

Remove tags and keep text (best-effort).

Unescape common HTML entities.

Well-formedness check (DOMParser) — not a full W3C nu validator.

Convert HTML to Markdown (turndown).

Edit Markdown with a live HTML preview (marked).

Convert Markdown to HTML in the browser.

Pretty-print CSS stylesheets.

Live preview for offset, blur, spread, and color — copy the value in one click.

Minify CSS with clean-css.

Basic brace/bracket balance and structure hints — not full W3C.

Create SVG wave, curve, tilt, and zigzag dividers for sections — copy SVG or CSS.

Turn inline SVG into a data URL and copy-ready background-image CSS.

Browse SVG utilities: CSS background converter and shape divider generator — all client-side.

Monaco IDE: run JavaScript, TypeScript, Python, Java, C++, Go in a remote sandbox; preview HTML locally. Shortcuts, console, starter templates.

Pretty-print JavaScript with js-beautify.

Escape a string for use inside JavaScript quotes.

Minify JS with terser (may fail on invalid syntax).

Unescape JavaScript string escapes.

Escape a string for embedding in JSON.

Format, minify, and validate JSON — fix payloads before APIs or configs.

Remove whitespace from JSON — compact one-liner.

Unescape JSON string escapes.

Validate JSON and show parse errors with position.

Inspect header and payload (Base64URL). Read-only — does not verify signatures.

Convert JSON to a simple XML document.

Decode XML entities.

Encode special characters for XML text nodes.

Escape &, <, >, quotes for XML.

Pretty-print XML with indentation.

Collapse whitespace in XML.

Convert XML to JSON (fast-xml-parser).

Unescape XML entities.

Parse XML and report errors (DOMParser).

Convert JSON to YAML.

Convert YAML to formatted JSON.

Parse YAML and report errors (yaml package).

Parse CSV to JSON arrays with Papa Parse.

Convert JSON arrays to CSV with instant preview and download.

Convert JSON to a PHP array string.

Paste a PHP array literal — best-effort convert to JSON.

Split PostgreSQL, MySQL, MongoDB, Redis, and other connection URLs into scheme, host, port, user, and database.

Escape single quotes for SQL string literals.

Pretty-print SQL with sql-formatter.

Strip SQL comments and collapse whitespace.

Random word-style passphrases from a word list.

Cryptographically random passwords — length and charset.

Numeric PINs with secure randomness.

Generate cryptographically random strings — length, charset, and one-click copy.

Decode Base32 to UTF-8 text.

RFC 4648 Base32 for encoded identifiers, OTP secrets, and text-safe binary.

Encode UTF-8 text to RFC 4648 Base32.

Decode Base32 to hex string.

Encode hex bytes as Base32.

Decode Base58 to UTF-8.

Bitcoin-style Base58 — compact, avoids ambiguous characters (0, O, I, l).

Encode UTF-8 bytes as Base58.

Decode Base58 to hex.

Encode hex as Base58.

Decode Base64 to UTF-8 text.

Encode or decode Base64 for UTF-8 text — handy for APIs, tokens, and debugging.

Encode UTF-8 text to Base64.

Decode Base64 to hex bytes.

Render a data URL / raw Base64 image in the browser.

Encode hex as Base64.

Read a local image file to Base64 data URL.

MD5 digest (crypto-js) — not for security.

RIPEMD-160 digest.

Compute SHA-256, SHA-384, or SHA-512 digests of any text — Web Crypto, client-side only.

SHA-1 digest — legacy interoperability.

SHA-224 digest.

SHA-256 digest.

SHA3-256 digest (crypto-js).

SHA-384 digest.

SHA-512 digest.

Compute HMAC-SHA-256/384/512 hex for a secret and message — useful for webhooks and APIs.

HMAC-MD5 hex.

HMAC-RIPEMD160 hex.

HMAC-SHA1 hex.

HMAC-SHA224 hex.

HMAC-SHA256 hex.

HMAC-SHA3 hex.

HMAC-SHA384 hex.

HMAC-SHA512 hex.

Verify a password against a bcrypt hash.

Generate bcrypt hashes with configurable cost.

Hash passwords with bcrypt or verify a password against a hash — runs locally in your browser.

Turn any text or URL into a QR code — PNG data URL for download or embedding.

Decode QR from an image file — processing stays in your browser.

IPv4 CIDR — network and broadcast addresses, subnet mask, and usable host range.

Shows your public IP as seen by this site (server header).

Display navigator.userAgent and platform hints.

IEEE CRC-32 and Fletcher-16 over UTF-8 bytes — compare with firmware, ZIP, and network stacks.

Keep only selected pages (ranges like 1-3, 5, 8) and download a new PDF — client-side only.

Combine multiple PDF files in order — download one merged document. Runs entirely in your browser.

Plain-text scratch pad with optional share link (base64 in the URL), clipboard copy, and .txt download — no server upload.