Developer Tools
JSON, YAML, CSV, XML, Base64, JWT, hashes, regular expressions and more. Paste data that may contain secrets without worry: all processing runs client-side.
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JSON FormatterFormat and beautify JSON with 2-space, 4-space or tab indentation and optional key sorting. Shows exact error locations.JSON to CSV ConverterConvert JSON arrays to CSV for Excel and Google Sheets. Flattens nested objects into dot-notation columns.Base64 EncoderEncode text (UTF-8) or any file to Base64, with URL-safe and MIME line-wrapping options and data-URI output.JWT DecoderDecode JSON Web Tokens to read header and payload claims, with human-readable dates and an expiry check.Regex TesterTest JavaScript regular expressions live with match highlighting, capture groups, named groups and flags.Unix Timestamp ConverterConvert Unix epoch timestamps to dates and back. Auto-detects seconds, milliseconds and microseconds. Live clock.Diff CheckerCompare two code or text files line by line with line numbers, whitespace-ignore option and .patch export.Color ConverterConvert colors between HEX, RGB, HSL, HSV and CMYK, with a color picker and WCAG contrast ratios.
All developer tools (30)
JSON FormatterFormat and beautify JSON with 2-space, 4-space or tab indentation and optional key sorting. Shows exact error locations.JSON ValidatorValidate JSON and pinpoint syntax errors with line, column and a highlighted code excerpt.JSON MinifierMinify JSON by removing whitespace and line breaks. See the exact byte savings. Validates while minifying.JSON to CSV ConverterConvert JSON arrays to CSV for Excel and Google Sheets. Flattens nested objects into dot-notation columns.CSV to JSON ConverterConvert CSV or TSV to JSON with header detection, automatic number/boolean typing and delimiter auto-detection.CSV Duplicate RemoverRemove duplicate rows from CSV files, comparing whole rows or only selected columns such as email.XML FormatterPretty-print XML, RSS, SVG and sitemaps with proper indentation and tag-mismatch detection.HTML FormatterBeautify messy or minified HTML with consistent indentation, including embedded CSS and JavaScript.CSS MinifierMinify CSS with structural optimizations (merging rules, shortening colors) using CSSO. Shows size savings.JavaScript MinifierMinify JavaScript with Terser: compress code, shorten variable names and optionally drop console calls.Base64 EncoderEncode text (UTF-8) or any file to Base64, with URL-safe and MIME line-wrapping options and data-URI output.Base64 DecoderDecode Base64 or Base64URL to text or download it as a file. Accepts data URIs and tolerates missing padding.URL EncoderPercent-encode text for URLs and query strings: component, full-URL or form (+ for spaces) modes.URL DecoderDecode percent-encoded URLs and query strings and list every query parameter in a table.JWT DecoderDecode JSON Web Tokens to read header and payload claims, with human-readable dates and an expiry check.UUID GeneratorGenerate random UUID v4 or time-ordered UUID v7 identifiers in bulk, with uppercase and no-hyphen options.SHA-256 Hash GeneratorGenerate SHA-256 hashes of text or files (up to 500 MB) and HMAC-SHA256 signatures. Verify file checksums.MD5 Hash GeneratorCompute MD5 hashes of text or large files (streamed, up to 2 GB) and compare against expected checksums.Regex TesterTest JavaScript regular expressions live with match highlighting, capture groups, named groups and flags.Unix Timestamp ConverterConvert Unix epoch timestamps to dates and back. Auto-detects seconds, milliseconds and microseconds. Live clock.Cron Expression ExplainerTranslate cron expressions into plain English and preview the next run times. Supports ranges, steps and names.Markdown PreviewWrite Markdown with a live, sanitized GitHub-flavored preview. Export as .md or .html.HTML Entity EncoderEscape text for safe use in HTML: minimal (&, <, >, quotes), all named entities, or all non-ASCII characters.HTML Entity DecoderDecode named, decimal and hex HTML entities (&, ©, 😀) back into readable characters.JSON to YAML ConverterConvert JSON to clean YAML for Kubernetes, Docker Compose, GitHub Actions and config files.YAML to JSON ConverterConvert YAML (including multi-document files, anchors and aliases) to JSON with clear error messages.Diff CheckerCompare two code or text files line by line with line numbers, whitespace-ignore option and .patch export.Color ConverterConvert colors between HEX, RGB, HSL, HSV and CMYK, with a color picker and WCAG contrast ratios.HEX to RGB ConverterConvert HEX color codes (#RGB, #RRGGBB, #RRGGBBAA) to RGB values and normalized 0–1 channels.RGB to HSL ConverterConvert RGB colors to HSL (hue, saturation, lightness) for easier palette creation in CSS.