Code & web

JSON, regex, Base64, SHA-256, cron, IP subnets, colours, Markdown, IBAN: the toolbox for developers and site builders, 100% in your browser.

32 calculators
Binary, decimal, hex converterConvert a number between binary, octal, decimal and hexadecimal.Open →
Password generatorCreate a strong random password, generated in your browser and never sent anywhere.Open →
Password strength checkerHow long would it take to guess your password? (nothing is sent)Open →
HEX, RGB, HSL color converterConvert a color between HEX, RGB and HSL, with a preview and shades.Open →
Color contrast checkerCheck whether text is readable on its background under WCAG accessibility rules.Open →
Word and character counterWords, characters, sentences and reading time of a text (essay, post, bio…).Open →
Text case converterTurn text into UPPERCASE, lowercase, Title Case, camelCase, snake_case or kebab-case.Open →
Base64 encoder / decoderEncode text to Base64 or decode a Base64 string, including accents and emoji.Open →
URL encoder / decoderEncode spaces and special characters in a link, or make an encoded link readable.Open →
Unix timestamp converterTurn a Unix timestamp into a readable date, or a date into a timestamp.Open →
UUID generatorGenerate unique UUID v4 identifiers for databases and projects.Open →
Aspect ratio calculatorFind the aspect ratio (16:9, 4:3…) of an image or video, and the right height for a new width.Open →
JSON formatter and validatorPretty-print, minify and validate JSON. The error is pinpointed if it's invalid.Open →
Regex testerTest a regular expression against text: matches, positions and captured groups.Open →
SHA-256 hash generatorThe SHA-256 fingerprint of a text, to check integrity or compare values.Open →
Lorem ipsum generatorPlaceholder text for your mockups: paragraphs, sentences or an exact word count.Open →
URL slug generatorTurn a title into a clean web address: no accents, no spaces, lowercase.Open →
Text diff checkerFind lines added, removed or unchanged between two versions of a text.Open →
Cron expression explainerTranslate a cron expression into plain English and see its next 5 runs.Open →
Chmod calculatorConvert an octal code (755) to readable permissions (rwxr-xr-x) and back.Open →
IPv4 subnet calculator (CIDR)Network address, broadcast, mask and number of hosts from an IP and prefix.Open →
JWT decoderRead the header and payload of a JWT, with its expiry date. Nothing is sent anywhere.Open →
HTML entity encoder / decoderEscape <, >, & and quotes to show them in a web page, or decode entities.Open →
CSV to JSON converterTurn a CSV table (Excel, Google Sheets) into JSON, with separator detection.Open →
px to rem converterConvert pixels to rem (and back) for accessible CSS.Open →
CSS gradient generatorCreate a linear or radial gradient and copy the ready-to-use CSS.Open →
Text to ASCII / Unicode codesDecimal, hex, binary and UTF-8 codes for every character in a text.Open →
CSS minifierShrink a stylesheet by removing comments, spaces and line breaks.Open →
Markdown to HTML converterTurn Markdown (headings, bold, lists, links, code) into clean HTML.Open →
IBAN validatorCheck that an IBAN is well-formed (check digits) and format it in groups of 4. Nothing is sent anywhere.Open →
Colour palette generatorComplementary, analogous, triadic colours and shades from a base colour.Open →
SMS character counterHow many SMS your text will use, depending on GSM or Unicode encoding (emojis, accents).Open →