Everything in the catalog

Builds gradient backgrounds with linear, radial or conic fills and overlay patterns such as noise and shapes.

Fetches up to 1,000 recent comments by a Hacker News user.

Charts how often several search terms appear in Hacker News stories per month over a date range you pick.

Adds ids to every heading in an HTML snippet and builds a linked table of contents.

Converts special characters to HTML entities and back again.

Write HTML in one pane and see it rendered immediately in another, with a copy button.

Finds tables in pasted HTML or rich text, previews each one and exports it as CSV, TSV, JSON, Markdown or HTML.

Runs HTML, CSS and JS in an iframe with configurable sandbox restrictions to see their effect.

Recompresses an image as JPEG at a quality you set and lets you flip between original and result.

Traces a JPG or PNG into an SVG vector using imagetracerjs and shows the code to copy.

Formats JSON that is cut off or malformed, adding indentation as you type and reporting validation state.

Estimates the token cost of an image for Jina embeddings by counting 224-pixel tiles.

Front end for the Jina Reader API that turns a URL into Markdown or text, with an optional Claude summary step.

Compares two JSON documents and highlights added, removed and changed values with character-level detail for strings.

Define properties and nested objects in a form and copy the JSON Schema it generates.

Converts JSON to YAML in block, flow and quoted-string styles side by side.

Type or load LaTeX and see it typeset beside the editor, either as a single MathJax equation or a whole document.

A full-screen countdown timer with large digits and an optional warning threshold.

Lists unique links, with titles, from pasted web content and exports them as plain text, Markdown or HTML.

Highlights phrases and sentence patterns often seen in LLM-written prose, based on a catalogue of known tells.

Try one JavaScript library against OpenAI, Anthropic or Gemini models by picking a provider and pasting a key.

Animates a world map between the Mercator and Equal Earth projections to show how each one distorts area and shape.

Live Markdown preview from pasted text, a raw URL or a Gist, with tables, code blocks and inline SVG shown as tabs.

Sends Markdown to GitHub's rendering API, shows a live preview and lets you copy the HTML or rich text.