Online tools — paste and work

Paste. Inspect. Export.

Input is processed in this tab, without uploads or model calls. Switching tools keeps your work; reloading clears it.

Markdown to WeChat

Paste Markdown, select a theme and copy formatted text into the WeChat body editor. Supports headings, lists, quotes, code, tables and HTTPS images. Links can become end references. Article text stays local; images load from their source URLs. Preview in WeChat before publishing; external images may need uploading. Raw HTML is text, and formulas/Mermaid need converting to images first. Up to 100,000 characters / 300 KB / 3,000 lines / 30 images. Download Markdown to keep your work.

JSON

200,000 characters / 200 KB; up to 80 levels. Syntax validation, code and tree views. Large numbers, decimal spelling, key order and duplicate keys are preserved. Large previews are paginated; exports are complete. Duplicate keys can be ambiguous in downstream tools.

Mermaid

Paste Mermaid code or a Markdown code block. Flowcharts, sequence and class diagrams run locally. Common flowchart syntax repairs are validated before application and can be undone. Unresolved errors keep your original code. Up to 20,000 characters, 300 lines and 120 edges; no initialization directives. Export SVG or source.

AI cost comparison

Enter input tokens, output tokens, cache hit rate and calls for immediate six-model estimates. Chinese RMB quotes use an editable budget exchange rate to USD; original rates and official sources remain visible. Token usage only; cache writes and storage are extra.