Developer & Text Tools
Format JSON, generate secure passwords and mock datasets, build QR codes and favicons. Safe for real payloads because nothing is transmitted off-device.
Pasting confidential production payloads or authentication tokens into random web formatters creates severe compliance vulnerabilities. Yuitility processes developer payloads entirely in client-side memory so your proprietary data never leaks.
Data and formatting
Format and validate minified JSON payloads with line-numbered syntax alerts, synthesize mock datasets for local databases, compute word counts, and decompress ZIP archives.
Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.
Open the text case converterCharacter & Limit Counter
Count characters, words, sentences, reading time, and social platform limit progress.
Open the character & limit counterDuplicate Line Remover
Remove duplicate lines from text lists with sorting and trimming options.
Open the duplicate line removerText Reverser & Flip Text
Reverse string order, word order, or flip text upside-down instantly.
Open the text reverser & flip textText & String Repeater
Repeat any string N times with custom separators and line breaks.
Open the text & string repeaterURL Slug Generator
Convert titles and headlines into SEO-friendly clean URL slugs.
Open the url slug generatorText to ASCII Art Generator
Generate big ASCII text banner art for code README files.
Open the text to ascii art generatorText Cleaner & Extra Space Remover
Strip HTML tags, collapse extra whitespace, and join paragraphs.
Open the text cleaner & extra space removerCSS Minifier & Formatter
Minify or beautify CSS stylesheets with compression size metrics.
Open the css minifier & formatterJavaScript Minifier & Formatter
Minify JS scripts or format JavaScript code cleanly.
Open the javascript minifier & formatterHTML Formatter
Format HTML while preserving significant whitespace.
Open the html formatterJSON to CSV Converter
Convert JSON array data into downloadable CSV spreadsheets.
Open the json to csv converterColor Format Converter (HEX, RGB, HSL)
Convert color codes across HEX, RGB, HSL, CMYK, and CSS variables.
Open the color format converter (hex, rgb, hsl)JSON Formatter & Validator
Prettify, minify, validate, and explore complex JSON objects in an interactive node tree.
Open the json formatter & validatorFake Data Generator
Generate mock JSON, SQL, or CSV data for software testing.
Open the fake data generatorWord & Character Counter
Analyze writing structure, character counts, reading times, and keyword densities instantly.
Open the word & character counterZIP File Extractor
Open ZIP archives online, preview contents, and extract files locally.
Open the zip file extractorMarkdown to HTML Live Converter
Convert Markdown syntax into clean HTML code in real time.
Open the markdown to html live converterOpen MD File & Markdown Viewer
Open .md files with local text processing, split-view editing and remote images blocked by default. Export Markdown, HTML or Word-compatible .doc.
Open the open md file & markdown viewerText Diff Checker
Compare two text files or code snippets to find line differences.
Open the text diff checkerLorem Ipsum Text Generator
Generate placeholder text, paragraphs, and words for design mockups.
Open the lorem ipsum text generatorSecurity, encoding and regex
Generate cryptographically secure passwords and UUIDs, encode Base64 and URLs, hash strings with Web Crypto, test regular expressions, and convert color codes.
JWT Token Decoder
Decode JSON Web Tokens (JWT) to inspect header and payload claims securely.
Open the jwt token decoderPassword Pattern Checker
Check password length, character variety and common patterns locally.
Open the password pattern checkerText Encryptor & Decryptor (AES)
Encrypt sensitive text with a secret key passphrase securely.
Open the text encryptor & decryptor (aes)File SHA-256 Hash Verifier
Compute and verify SHA-256 checksums for local files to check integrity.
Open the file sha-256 hash verifierPassword Generator
Generate highly secure random passwords with customizable parameters and strength analysis.
Open the password generatorUUID v4 & GUID Generator
Generate cryptographically secure random UUID v4 strings in batch.
Open the uuid v4 & guid generatorMD5 & SHA256 Hash Generator
Generate MD5, SHA-1, and SHA-256 cryptographic hashes.
Open the md5 & sha256 hash generatorBase64 Encoder & Decoder
Encode text strings and decode Base64 data safely.
Open the base64 encoder & decoderURL Encoder & Decoder
Encode text to URI components and decode percent-encoded URLs.
Open the url encoder & decoderRegEx Pattern Tester & Matcher
Test regular expressions against target text with regex flags.
Open the regex pattern tester & matcherHEX to RGB & HSL Color Converter
Convert color codes between HEX, RGB, HSL, and HSV formats.
Open the hex to rgb & hsl color converterMorse Code Encoder & Decoder
Translate plain text to Morse code signals and audio simulation.
Open the morse code encoder & decoderQR Code Generator
Create custom QR codes for texts, URLs, WiFi networks, phone numbers, and emails.
Open the qr code generatorPalette & Contrast Checker
Generate color schemes and test text-to-background contrast using official WCAG guidelines.
Open the palette & contrast checkerEverything else in this category
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Local-first by design
Every tool on this page runs entirely in your browser. Your files and data never leave your device — no uploads, no server processing, no tracking. Works offline after first load.