RenderHub — 18 in-browser tools to preview, edit, encode & convert

A growing collection of browser-only tools for HTML, Markdown, JSON, YAML, CSV, XML, TOML, SVG, Mermaid, LaTeX, JWT, Base64, Diff, Regex, QR, Cron, Timezone, and CIDR. Everything stays on your device — no uploads, no accounts.

Preview

Render text formats with live preview.

HTML

Live preview in a sandboxed iframe.

Markdown

GitHub-flavored Markdown rendering.

JSON

Validate, format, and minify JSON.

YAML

Validate, format, and convert YAML to JSON.

CSV / TSV

Render delimited text as a table; convert to JSON.

XML

Pretty-print and validate XML.

TOML

Parse, validate, and convert TOML to JSON.

Mermaid

Render Mermaid diagrams to SVG.

SVG

Live preview SVG markup as a vector image.

LaTeX / Math

Render LaTeX math with KaTeX.

Encode

Encode, decode, and inspect tokens.

JWT

Decode JWT header and payload locally.

Base64 / URL

Encode and decode Base64 and percent-encoded URLs.

Utility

Everyday text & data helpers.

Diff

Side-by-side text comparison.

Regex

Test JavaScript regular expressions against text.

QR code

Generate QR codes from text or URLs.

Timestamp / Timezone

Convert a Unix timestamp across IANA timezones.

Cron

Parse cron expressions and preview upcoming runs.

IP / CIDR

Inspect IPv4 networks, masks, and ranges.