blutils.

local-only developer utilities. fast, open-source, and nothing leaves your browser.

local runtime/no network/41 tools

format5

dotenv / json.env ↔ JSON format converterJSON · YAML · TOML · CSV json formatvalidate & beautify json to typesinfer TypeScript interfaces markdowncommonmark · live preview

encode8

base converterbin · oct · dec · hex · any 2-36 base32 / base58RFC 4648 base32 · base58 (btc)base64encode / decode · url-safe hex viewertext ↔ hex · hexdump html entitiesencode / decode · named + numeric jwt signersign HS256/384/512 · local rot13 / caesarletter-rotation cipher url encodeencode / decode · component

hash2

hash generatormd5 · sha-1 · sha-256 · sha-512 hmacHMAC · SHA-256 / 384 / 512

text5

case convertercamel · snake · kebab · …line toolssort · unique · trim · reverse slugifyurl-safe slugs text diffline-by-line · LCS text statisticscounts · reading time

time3

cron parser5-field cron + next runs timezoneconvert across time zones unix timeepoch ↔ date · live

generate6

lorem ipsumfiller text generator passwordpassword · passphrase · entropy qr codetext or URL → QR · SVG random stringtokens · custom charset · CSPRNG ulidsortable · Crockford base32 uuidv4 · random · RFC 9562

inspect12

chmod calculatoroctal ↔ rwx permissions color converterhex ↔ rgb ↔ hsl contrast checkerWCAG ratio · AA / AAA hash identifierguess hash type http statusstatus codes · meanings json diffsemantic diff · by path json treecollapsible tree · path copy jwt decoderdecode header · payload · claims regex testerJavaScript flavour · live highlight subnet calculatorIPv4 CIDR · ranges · masks unicode inspectorcode points · escapes · UTF-8 url parserprotocol · host · path · query