100% Client-Side
Free Online Developer Tools
A growing library of developer utilities that run entirely in your browser — free, no signup, and your input never leaves your machine.
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All 93 Tools_
Every utility in the registry. Tools marked soon are on the roadmap and not yet clickable.
- JSON FormatterPrettify, validate, and minify JSON payloads instantly.
- XML FormatterPretty-print and indent XML documents.
- HTML FormatterReformat messy HTML with consistent indentation.
- CSS Beautifier and MinifierFormat or minify CSS without touching the whitespace that is grammar.
- JavaScript BeautifierReformat minified or messy JavaScript, and know what cannot come back.
- SQL FormatterFormat SQL queries with keyword casing and indentation.
- YAML FormatterRe-indent and validate YAML without losing your comments.
- JSON MinifierStrip whitespace from JSON, and see what it actually saved.
- CSS MinifierCompress CSS and see the saving after gzip, not before.
- JavaScript MinifierMinify JavaScript through a real parser, and see which switch is risky.
- HTML MinifierCompress HTML markup without collapsing whitespace the browser renders.
- SQL MinifierCollapse SQL queries to a single compact line.
- Markdown Editor & PreviewWrite Markdown with a live rendered preview.
- Unix Timestamp ConverterConvert epoch timestamps to readable dates and back.
- JSON to YAML ConverterConvert JSON to YAML, quoting the values YAML would otherwise reinterpret.
- YAML to JSON ConverterConvert YAML to JSON, with a report of everything the conversion cost.
- JSON to CSV ConverterFlatten JSON arrays into CSV rows.
- CSV to JSON ConverterTurn CSV rows into JSON objects.
- XML to JSON ConverterConvert XML to JSON with the mapping shown, not guessed.
- JSON to XML ConverterConvert JSON to XML, with a report of what the target had to change.
- Markdown to HTML ConverterConvert Markdown to sanitised HTML, with the flavour stated.
- PDF to Markdown ConverterExtract a PDF into Markdown, with its structure inferred and reported.
- HTML to Markdown ConverterConvert HTML back to Markdown, with an account of what was lost.
- Binary to Decimal ConverterConvert base-2 numbers to decimal.
- Decimal to Binary ConverterConvert decimal numbers to base-2.
- Hex to Decimal ConverterConvert hexadecimal values to decimal.
- Decimal to Hex ConverterConvert decimal numbers to hexadecimal.
- Binary TranslatorDecode binary byte sequences into text.
- Text to Binary ConverterEncode text as binary byte sequences.
- HEX to RGB ConverterConvert HEX color codes to RGB values.
- RGB to HEX ConverterConvert RGB values to HEX color codes.
- OKLCH to HEX ConverterConvert OKLCH colors to HEX codes.
- HSL to HEX ConverterConvert HSL colors to HEX codes.
- MB to GB ConverterConvert data sizes in decimal and binary at once, and see why they disagree.
- Aspect Ratio CalculatorCalculate dimensions that keep an aspect ratio.
- Base64 EncoderEncode text to Base64, UTF-8 safe.
- Base64 DecoderDecode Base64 back to readable text.
- URL EncoderPercent-encode text for safe use in URLs.
- URL DecoderDecode percent-encoded URL strings.
- JWT DecoderDecode JSON Web Tokens without sending secrets anywhere.
- HTML Entity Encoder and DecoderEscape text into HTML entities, or decode them back.
- HTML Entity DecoderDecode HTML entities, and see how many times they were encoded.
- Escape CharactersEscape a string as a source-code literal for fifteen languages.
- Unicode Escape/UnescapeEscape and unescape Unicode sequences.
- String to Hex ConverterConvert strings to hex byte values and back.
- Caesar CipherEncode, decode, or break a Caesar shift without the key.
- ROT13 Encoder/DecoderApply the ROT13 letter-substitution cipher.
- Punycode ConverterConvert internationalized domains to Punycode and back.
- UUID GeneratorGenerate cryptographically strong unique identifiers.
- Password GeneratorCreate strong random passwords with custom rules.
- Passphrase GeneratorGenerate memorable multi-word passphrases with the entropy shown as arithmetic.
- Hash GeneratorCompute MD5 and every SHA digest for text or a file, and compare a checksum.
- MD5 Hash GeneratorCompute the MD5 of text or a file, and verify a published checksum.
- SHA256 Hash GeneratorCompute SHA-256 and HMAC-SHA256 for text or a file, and verify a checksum.
- Bcrypt Hash GeneratorGenerate and verify bcrypt password hashes, with the cost factor timed.
- Lorem Ipsum GeneratorGenerate placeholder text at any length.
- Random Number GeneratorGenerate random numbers in a custom range.
- URL Slug GeneratorTurn any title into a clean URL slug, with accents mapped rather than stripped.
- QR Code GeneratorCreate QR codes for URLs, Wi-Fi, contacts, and more.
- Cron Expression GeneratorRead a cron expression in English and see when it next fires.
- MAC Address GeneratorGenerate valid random MAC addresses, and read the flags in any address.
- Htpasswd GeneratorCreate htpasswd entries for basic auth.
- JWT GeneratorBuild and sign test JSON Web Tokens, with the missing claims flagged.
- Secret Key GeneratorGenerate random API keys and secrets.
- JSON Schema GeneratorInfer a JSON Schema from a sample document.
- Fake JSON Data GeneratorGenerate fake JSON from a seed, so the same fixture comes back.
- Diff CheckerCompare two texts and highlight differences.
- Regex TesterTest regular expressions against sample text live.
- Text Case ConverterSwitch text between upper, lower, title, and camel case.
- Character CounterCount characters, words, and sentences.
- Line CounterCount lines in any block of text.
- Word CounterCount words, characters, and reading time as you type.
- Remove Duplicate LinesDelete duplicate lines from a list.
- Sort Lines AlphabeticallySort lines alphabetically or numerically.
- Find and Replace TextFind and replace many pairs at once, in a single pass.
- Whitespace RemoverStrip extra spaces, tabs, and blank lines.
- JSON Escape/UnescapeEscape and unescape JSON strings.
- JSONPath TesterQuery JSON documents with JSONPath expressions.
- Text CompareCompare two blocks of text side by side.
- Meta Tag GeneratorGenerate SEO meta tags for any page.
- Open Graph GeneratorBuild Open Graph tags and see how six platforms will render them.
- Robots.txt GeneratorCompose a valid robots.txt file.
- Htaccess Redirect GeneratorGenerate .htaccess redirect rules.
- UTM BuilderBuild campaign URLs with UTM parameters.
- User Agent ParserParse user agent strings into browser and OS details.
- HTTP Status Codes ReferenceLook up every HTTP status code and its meaning.
- MIME Types LookupLook up MIME types by file extension.
- Chmod CalculatorConvert Unix permissions between symbolic and octal, with the risk spelled out.
- CSS Gradient GeneratorDesign CSS gradients visually.
- Box Shadow GeneratorDesign CSS box shadows visually.
- Border Radius GeneratorPreview and tune CSS border radius.
- Flexbox GeneratorExperiment with flexbox layouts visually.
- Favicon GeneratorCreate favicon.ico and PNGs in every required size.
100% client-side
Every transformation runs in your browser. Nothing you paste is ever uploaded.
Free, no signup
No accounts, no paywalls, no usage limits. Open a tool and use it.
Instant results
No server round-trips while you work — processing happens locally, so results appear as you type.