{ }IDevs78 tools · free

Index

All 78 tools

Every tool is a single page, runs locally, and needs no account.

Format

JSON FormatterPretty-print JSON with sorted keys and errors explained. JSON MinifyStrip every unnecessary byte from JSON. JSON to CSVFlatten an array of objects into CSV. SQL FormatterUppercase keywords and break clauses onto new lines. CSS MinifierRemove comments and whitespace, keep the CSS valid. HTML MinifierCollapse whitespace between tags. CSV to JSONConvert CSV with a header row into JSON. JSON to TypeScriptGenerate TypeScript interfaces from JSON. Markdown PreviewRender Markdown to HTML (headings, lists, code, links). JS BeautifierRe-indent JavaScript with braces and brackets. JS MinifierStrip comments and needless whitespace (conservative). XML FormatterIndent XML tags and keep attributes intact. JSON Path ExtractPull a value out of JSON with a dot path. CSV Column PickerKeep only the columns you name, in that order. YAML to JSONSimple YAML (maps, lists, scalars) to JSON. CSV to SQL INSERTTurn CSV rows into INSERT statements.

Encode

Base64 Encode / DecodeRound-trip Base64 with Unicode support. URL Encode / DecodePercent-encode a string or component. HTML EntitiesEscape or unescape <, >, &, quotes and Unicode. Hex Encode / DecodeConvert text to hex bytes and back. ROT13 / CaesarShift letters by any amount. JWT DecoderDecode header, payload and expiry — no verification. SHA-256 HashSHA-256 digest of any text, in hex. SHA-1 HashSHA-1 digest (legacy checksums, not security). SHA-512 HashSHA-512 digest in hex. HMAC-SHA256Signed message with a secret key — hex output. SHA-384 HashSHA-384 digest — stronger than SHA-256. CRC32 ChecksumCRC-32 checksum in hex and decimal. Base32 Encode / DecodeRFC 4648 base32, useful for keys and TOTP. Base64 URL-safeBase64 for URLs and JWTs (no + / =). Unicode EscapeEscape to \uXXXX and back. Text ↔ BinaryConvert text to 8-bit binary and back. JSON String EscapeEscape or unescape text for embedding in JSON.

Text

Word & Character CountWords, characters, sentences, lines and reading time. Case ConverterUPPER, lower, Title, Sentence, camel, snake, kebab. Remove Duplicate LinesDeduplicate a list, optionally ignoring case. Sort LinesAlphabetical or numeric, ascending or descending. Slug GeneratorURL-safe slugs from any title. Lorem IpsumDummy paragraphs, words or sentences. Text DiffLine-by-line comparison of two texts. Strip HTML TagsRemove every tag, keep the text. Extract Emails & URLsPull every email address and link out of text. Reverse TextReverse characters, words or lines. Trim LinesTrim each line and optionally drop blank lines. Word FrequencyCount the most common words, ignoring stop words. Reading TimeReading time and speaking time for any text. Palindrome CheckerCheck forwards and backwards, ignoring case and punctuation. Remove Line BreaksJoin lines into one paragraph, keeping or dropping spaces. Text StatisticsAverage word length, longest word, sentence size.

Convert

Timestamp ConverterUnix seconds ↔ ISO date ↔ local time. Number Base ConverterBinary, octal, decimal and hex at once. Roman NumeralsNumbers ↔ Roman numerals (1–3999). Colour ConverterHEX, RGB, HSL and a live swatch. Byte Size ConverterBytes ↔ KB ↔ MB ↔ GB, binary and decimal. Number to WordsWrite a number out in English words. PX ↔ REM ConverterConvert pixels and rem at any root font size. Colour PaletteGenerate shades and tints from one colour. Temperature ConverterCelsius, Fahrenheit and Kelvin at once. Degrees ↔ RadiansAngle conversion with sin/cos/tan values. Colour Contrast (WCAG)Contrast ratio between text and background, AA/AAA.

Generate

UUID GeneratorCryptographic UUID v4 and v7. Password GeneratorStrong random passwords with a strength meter. Random NumberUniformly random integers in a range. Coin Flip & DiceFlip coins and roll dice with real randomness. ULID GeneratorSortable, time-ordered IDs (Crockford base32). NanoID GeneratorShort URL-safe random IDs. Random StringCryptographic random strings with length control.

CSS

Box Shadow BuilderLayered shadows with live preview and CSS output. CSS GradientLinear and radial gradients from two colours. Border RadiusSquircle, pill and blob radii. CSS clamp() GeneratorFluid type scale between a minimum and maximum.

Web & SEO

Regex TesterTest a pattern with flags and see every match. Cron ExplainerExplain a cron expression and list the next runs. HTTP Status CodesLook up any status code, or list them by class. MIME Type LookupFile extension → content type (and back). URL ParserBreak a URL into protocol, host, path and query. Meta Tag GeneratorSEO meta, Open Graph and Twitter tags from a title and URL. Robots.txt GeneratorBuild a robots.txt with sitemap and disallow rules.