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Developer Tools
Format and validate JSON, test regular expressions, encode Base64, convert color codes and build palettes, generate favicon sets, meta tags and sitemaps, and preview Markdown. Your code and data stay in the browser.
Files are processed in your browser and never uploaded
11 developer tools
- JSON Formatter & ValidatorPretty-print JSON, pinpoint errors, minify, sort keys, escape/unescape strings
- Regex TesterHighlight matches, see capture groups, preview replacements, common patterns
- Base64 Encode / DecodeText (UTF-8) ↔ Base64, files and images → data URI, Base64 → file
- Color Code ConverterConvert HEX, RGB, HSL, HSV and CMYK, check WCAG contrast, get lighter/darker shades
- Color Palette GeneratorComplementary, analogous, triadic and monochrome palettes from one color, or extract colors from a photo
- Favicon GeneratorText, emoji or logo → favicon.ico, 16–512 px PNGs, Apple touch icon and web manifest in a ZIP
- Meta Tag Generator (SEO & Open Graph)Build SEO, Open Graph and Twitter card tags from a title, description and image — with previews
- Sitemap Generator (sitemap.xml)Build sitemap.xml from a list of URLs — lastmod, changefreq, priority and the robots.txt line
- Markdown Preview & EditorWrite Markdown with a live preview — tables, task lists, code blocks; copy or save HTML
- What's My Screen Resolution? (Browser Info)Screen resolution, viewport size, pixel ratio, browser and OS, language, time zone, dark mode
- CSV Viewer & FilterOpen huge CSV/TSV files as a table — search, filter columns, sort, export the filtered rows
Other categories
- PDF ToolsMerge, split, compress, rotate, sign, protect
- Image ToolsCompress, resize, crop, remove background, OCR
- File ConvertersCSV ↔ Excel, Word/Excel → PDF, ZIP, audio, video
- Text ToolsWord count, line cleanup, diff, emoji, passwords
- Date & TimeDate calculators, timers, world clock
- QR & BarcodesQR codes for links, Wi-Fi and contacts, QR reader
- Internet & NetworkSpeed test, is the site down?