Tools

Unicode-safe Base64 encode and decode, with URL-safe variant.

Percent-encode and decode URLs and query components.

Decode a JWT's header, payload and time claims — or encode and HMAC-sign a new token. All in the browser.

SHA-1 / SHA-256 / SHA-384 / SHA-512 of text or files, via WebCrypto.

Binary, octal, decimal, hex — arbitrary precision via BigInt.

CSV to JSON and back — quoted fields, custom delimiters, header-row toggle. Values stay strings.

Hex, rgb, hsl, and oklch — plus a tints-and-shades palette and a WCAG contrast checker.

Convert between JSON, YAML, TOML, and TOON — auto-detects the input, points at the exact parse error, and shows the token-count savings of TOON's compact tabular arrays.

Pretty-print, minify, validate — with precise error positions.

camelCase, snake_case, kebab-case, Title Case, CONSTANT_CASE and more.

Line and word diff of two texts, computed locally.

Live match highlighting, capture groups, and a common-pattern library.

Split-pane markdown editor — live preview, right-to-left aware, copy as HTML, Markdown, or rich text.

Words, characters, lines, sentences, reading time — plus a live token count (GPT o200k by default, switchable to cl100k or Llama 3).

Epoch seconds/millis ⇄ human dates, timezone-aware, with relative time.

Cron expression → plain-English schedule + the next run times.

UUID v4 and v7, single or bulk, copy-ready.

Filler text by the word, sentence, or paragraph — copy-ready.

Text or URL → QR code as crisp SVG, with download. Decodes images too, where the browser can.

Plot functions on an interactive canvas — pan, zoom, multiple expressions, shareable links.

Resize, compress, and convert images — png, jpeg, webp — entirely in the browser. Handles batches.

Open a PDF and mark it up — signature, text, pen, highlight, boxes, lines, images — plus rotate, reorder, delete, append and extract pages. All in the browser.

Compose a prefilled email draft, plus quick contact links — email, GitHub, LinkedIn. Opens in your own mail client.