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Search, or choose a collection or a category. Every card opens the tool.
Paste HTML/CSS/JS and preview the page instantly — runs in your browser.
Mini CodePen: three panels plus live sandboxed preview.
Write Markdown and get clean HTML preview — all local.
Pretty-print or minify HTML in your browser.
Pretty-print or minify CSS in your browser.
Pretty-print or minify JSON safely in-browser.
Encode or decode URL strings (encodeURIComponent and friends).
Encode or decode Base64 and URL strings.
Decode a token header and payload. The signature is not checked.
Encode or decode HTML characters. The result is text, not a live page.
Build a two-color linear gradient and copy the CSS.
Turn a small image into a data URL. The limit is 2 MB.
Show a JSON value as nested keys.
Indent braces or strip spare space. It does not run the script.
Build a box shadow and copy the CSS.
Set four corner radii and copy the CSS.
Preview a clip shape. The file is not cut.
Preview a timing curve and copy the CSS.
Write title, description, and HTTPS tags you copy into the page head.
Draw up to 40 lines of code as a PNG. The code is not run.
Draw a spinning loader and copy the CSS.
Draw a square checkbox and copy the CSS.
Draw an on-off switch and copy the CSS.
Draw a frosted panel and copy the CSS.
Draw a two-color text offset and copy the CSS.
Draw a triangle with CSS borders.
Convert Unix seconds to a date, or a date to Unix seconds.
Build a CSS-only background pattern and copy the rule.
Generate React Native shadow style values with a live preview.
Decode an image data URL or Base64 string and download it.
Build a correctly quoted curl command (Bash, PowerShell or Windows cmd) and the matching JavaScript fetch() code for any HTTP request.
Read any user-agent string: browser and version, engine, operating system, device type and known bots and crawlers.
View and download the raw HTML a server returns for any public URL, with size, line count and all response headers.
Convert between JSON, CSV, TSV, XML, YAML, TOML, plain lists and Markdown tables — with headers, type detection and nested data flattened for spreadsheets.
Pretty-print, minify or check XML, YAML, TOML and SQL — with the exact line and column of the first error.
Check a whole list at once: each line is detected or checked as email, URL, IPv4/IPv6, UUID, MAC address or domain, with the reason when it fails.
Test a JavaScript regular expression against your text: highlighted matches, positions and capture groups, plus replace and split previews — with a hard time limit.
Break a URL into its parts and parameters, strip tracking tags (utm_, gclid, fbclid…), resolve relative links, sort query parameters and make encoded URLs readable.
Turn text into Unicode code points, UTF-8 / UTF-16 / UTF-32 units, or HTML, CSS, JavaScript and Python escapes — and back. Inspect every character’s category and script.
Convert text to binary, hexadecimal, octal or decimal bytes (UTF-8, UTF-16 or Latin-1) and decode bytes back into readable text.
Encode text to Base32 (RFC 4648 and base32hex), Base45 (RFC 9285, used in QR health codes), Base58 (Bitcoin alphabet) or Ascii85 — and decode them back.
Convert international domain names such as münchen.de or مثال.إختبار to their xn-- form and back — also inside email addresses and URLs.
Paste a cron schedule (5 fields or @daily-style macros) and see what each field means and the next run times in your time zone.
Build a cron schedule from plain choices — every N minutes, daily, weekdays, weekly, monthly or yearly at a time — and check the next run times before you deploy it.
Generate fake records for testing — names, example emails, fictional phone numbers, cities, dates, numbers, UUIDs, IPs, colours — as JSON, CSV, TSV, XML, YAML, NDJSON or SQL INSERTs.
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