Developer Tools

38 small utilities — encoders, hashers, converters, formatters. Everything runs in your browser. Nothing is uploaded.

Encode / Decode

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text. Supports URL-safe variant.

Base32 Encode / Decode

Encode and decode Base32 strings (RFC 4648, A–Z + 2–7).

URL Encode / Decode

Percent-encode or decode URLs and query parameters.

HTML Entities Encode / Decode

Escape or unescape HTML entities like &, <, and '.

Decode the header and payload of a JSON Web Token. Signature is not verified.

Image ↔ Data URL

Drop an image to get a base64 data URL, or paste a data URL to preview it.

Crypto & Hashing

Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text. Powered by Web Crypto.

Sign messages with HMAC-SHA-256/384/512/SHA-1 using a shared secret. Hex + base64 output.

AES-256-GCM Encrypt / Decrypt

Encrypt or decrypt text with a passphrase. PBKDF2-derived key, fresh salt + IV per message.

RSA Keypair Generator

Generate 2048 / 3072 / 4096-bit RSA keypairs and export them as PEM (PKCS#8 + SPKI).

Ed25519 Keypair Generator

Generate modern, fast Ed25519 keypairs and export them as PEM (PKCS#8 + SPKI).

Generators

Generate one or many cryptographically-random UUIDv4 identifiers.

Password Generator

Generate cryptographically random passwords with configurable length and character sets.

QR Code Generator

Generate QR codes from any text or URL, with custom size, error correction, and colors.

Lorem Ipsum Generator

Generate placeholder text in paragraphs, sentences, or words.

Formatters

JSON Format & Validate

Pretty-print, minify, and validate JSON. Errors point to the broken character.

Markdown Preview

Render GitHub-flavored markdown live, side-by-side with the source. Toggle to view HTML.

Validate SQL syntax across MySQL / PostgreSQL / SQLite dialects. Errors pinpointed.

Converters

Convert any UTF-8 text to hex bytes and back. Whitespace is ignored when decoding.

Convert between YAML and JSON in either direction.

Convert between CSV and a JSON array of objects, with proper handling of quoted fields.

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates, in your local zone and UTC.

Color Converter

Convert colors between HEX, RGB(A) and HSL(A) with a live preview.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal — instantly, all four at once.

Translate cron expressions into plain English, with handy presets you can click.

Files & Documents

Image Format Converter

Convert between PNG, JPEG and WebP. Adjustable quality, optional resize, side-by-side preview, no upload.

Image Compressor

Squeeze any image down to a target file size in KB or MB. Picks the highest quality that fits, auto-resizes if it has to.

Combine one or many images into a single PDF. Reorder pages, choose A4 / Letter / image-sized, set margins.

Render every page of a PDF to PNG or JPEG, fully in your browser. Tweak DPI / quality, click any page to download.

File Compressor

Compress or decompress any file with the browser's native gzip / deflate. Live ratio + savings readout.

Spreadsheet Converter

Drop CSV, TSV or XLSX and export as CSV / TSV / JSON / XLSX / HTML / PDF. Sheet picker, header detection, live preview.

Text

Test JavaScript-flavored regular expressions with live highlighting and match details.

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more.

Convert any title or sentence into a clean URL-safe slug. Handles accents and punctuation.

Compare two blocks of text line-by-line. Added lines are green; removed lines are red.

Text Statistics

Count words, characters, lines, sentences, and estimate reading time as you type.

Stringify / Parse

Escape any text — even huge multi-line input — into a JSON or JS string literal, or parse one back to raw text.

Describe what you want to do in plain English and get the matching shell or git command, with variants.