Other Developer Utilities

QR codes, TOML, UTM builder, meta tags and other handy utilities.

QR Code GeneratorCreate QR codes for URLs, text, Wi-Fi networks and emails with custom colours, size and error correction. Download as PNG or SVG.QR Code ReaderRead QR codes from an image file in your browser using the Barcode Detection API. Nothing is uploaded.TOML to JSON ConverterConvert TOML configuration such as Cargo.toml or pyproject.toml to JSON, with dates as ISO 8601 strings.JSON to TOML ConverterConvert a JSON object to TOML with tables and arrays of tables, ready for Cargo, Hugo or Python config files.INI to JSON ConverterConvert INI and .cfg files to JSON. Sections become objects, dotted sections nest and key[] lines become arrays.JSON to INI ConverterConvert a JSON object to an INI file. Nested objects become [section] and [section.child] blocks..env to JSON ConverterConvert a dotenv (.env) file to JSON, handling export prefixes, comments, quoted and multi-line values.JSON to .env ConverterConvert a JSON object to dotenv KEY=value lines, flattening nested keys and quoting values that need it.UTM Link BuilderBuild campaign URLs with utm_source, utm_medium, utm_campaign, utm_term and utm_content for analytics tracking.Meta Tag GeneratorGenerate SEO meta tags, Open Graph and Twitter card tags for a page, with title and description length checks.Robots.txt GeneratorCreate a robots.txt file with allow and disallow rules, crawl delay, sitemap links and optional AI crawler blocking.Markdown Table GeneratorTurn CSV, TSV or pipe-separated rows into a neatly aligned Markdown table with left, centre or right alignment.Unicode Character InspectorInspect every character in a text: code point, UTF-8 and UTF-16 bytes and Unicode category. Reveals invisible characters.Barcode GeneratorGenerate Code 128, EAN-13, EAN-8, UPC-A, Code 39, ITF-14, MSI, Pharmacode and Codabar barcodes, with check digits, as SVG or PNG.