yutils

Encode text to Base64 or decode Base64 back to text. Runs entirely in your browser, no data sent to any server.

Percent-encode text for safe use in URLs, or decode percent-encoded URLs back to text. Runs entirely in your browser.

Generate UUID v4 (random), UUID v7 (time-ordered, RFC 9562), or ULID identifiers — all client-side via crypto.

Format, validate, and minify JSON strings. Adjust indent and optionally sort keys. Runs entirely in your browser.

Decode the header and payload of a JSON Web Token. Signature is not verified (a public key is required). The token is processed entirely in your browser.

Generate a signed JSON Web Token with HS256/HS384/HS512 (HMAC-SHA). Payload and secret stay in your browser — Web Crypto API based.

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hash of text. Uses the browser's Web Crypto API; no data is sent to any server.

Encode text to hexadecimal or decode hex back to text. Supports UTF-8 multi-byte characters and tolerates whitespace.

Encode HTML special characters (&, <, >, ", ') to entities, or decode named/numeric entities back to text.

Convert strings between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case — all six cases shown side-by-side.

Convert between Unix timestamps (seconds/milliseconds) and ISO 8601 / UTC / locale time. Auto-detects input.

Convert colors between HEX, RGB, and HSL with a live preview swatch. Auto-detects any of the three input formats.

Test JavaScript regular expressions with live match results. Supports g/i/m/s/u/y flags and capture groups.

Convert an image file to a Base64 data URI for inline embedding in HTML/CSS/Markdown. Up to 5 MB.

Render Markdown to HTML side-by-side. Supports CommonMark + GFM (tables, fenced code, task lists). marked is lazy-loaded.

Convert HTML into Markdown. Headings, lists, links, code, tables, blockquotes. Uses the browser's DOMParser — accurate, 0 dependency.

Convert between YAML and JSON. Tolerates comments and multiline strings on the YAML side. yaml is lazy-loaded.

Generate a QR code from any text or URL. Adjustable error correction (L/M/Q/H), SVG output, downloadable.

Translate a cron expression into human-readable text and preview the next 5 run times. Locale-aware.

Build a cron expression visually — pick minute / hour / day / month / weekday from presets or free input. Preview human-readable text and next 5 run times.

Compare two texts and highlight added/removed lines, words, or characters.

Compare two JSON values, with optional key sorting and JSON-aware error messages.

Generate cryptographically strong passwords, tokens, random strings, and passphrases with entropy display.

Convert between CSV and JSON. Handles quoted fields, custom delimiters, and header rows.

Convert numbers between bases (binary/octal/decimal/hex/base36) using BigInt for large integers. Auto-detects 0b/0o/0x prefixes.

Format SQL queries with proper indentation and keyword casing. Supports PostgreSQL, MySQL, SQLite, and standard dialects.

Pretty-print or minify XML with attribute preservation. Handles SOAP, sitemaps, and config files.

Convert between XML and JSON with attribute and element handling.

Decompose a URL into protocol, host, path, query parameters, and hash — read-only inspection.

Paste any text and get tool recommendations — JSON, JWT, Base64, URL, UUID, Cron, and 9 more types auto-detected.

Generate placeholder text in words, sentences, or paragraphs. Classic Lorem Ipsum or randomized.

Compute HMAC (Hash-based Message Authentication Code) with SHA-1/256/384/512 using the Web Crypto API.

Verify whether a given HMAC signature matches the message + secret. Constant-time comparison via Web Crypto API.

Compute MD5 hash for text. Note: MD5 is broken for security — checksums and legacy compatibility only.

Query JSON with JSONPath expressions ($.store.book[*].author etc.) and inspect matches.

Convert international domain names to/from Punycode (xn-- encoded ASCII). Uses native URL parser.

Browse and search HTTP status codes (1xx-5xx) with descriptions and common usage.

Parse User-Agent strings into browser, OS, device, and engine fields.

Hash passwords with Bcrypt or verify a plaintext against an existing hash. Configurable salt rounds.

Validate JSON data against a JSON Schema (Draft 2020-12). Powered by Ajv with format support.

Generate a JSON Schema (Draft 2020-12) from a sample JSON. Infer types, required fields, and nested structures automatically.

Beautify or minify HTML with proper indentation, attribute alignment, and configurable wrap.

Beautify or minify CSS with proper indentation. Configurable selector and property style.

Beautify or minify JavaScript with brace style and indent options. Powered by js-beautify.

Convert between TOML (Tom's Obvious Minimal Language) and JSON. Used in Cargo.toml, pyproject.toml, etc.

Parse Cookie or Set-Cookie strings into a table. Decode percent-encoded values. Supports Set-Cookie attributes (Path/Domain/Max-Age/SameSite/HttpOnly/Secure).

Convert INI configuration to JSON and back. Supports sections, comments (; or #), and key=value.

Compute network address, broadcast, host range, mask, and host count from an IPv4 + CIDR.

Build cURL commands from URL/method/headers/body. Auto-detects JSON content-type.

Convert datetime between IANA time zones using the browser's Intl API.

Format a date with patterns (YYYY-MM-DD HH:mm:ss). Live preview of common formats.

Generate TypeScript interfaces from a JSON sample. Nested objects become separate interfaces.

Convert a JavaScript object literal (unquoted keys, single quotes, trailing commas, comments) into standard JSON. Lenient parser, strict output.

Convert text into a URL-safe slug. Configurable separator, lowercase, and accent stripping.

Convert indented text or path list into a box-drawing tree (├── │ └──).

Generate a unified diff (-u) patch from two text inputs. Compatible with `git apply` / `patch -p0`.

Generate fake JSON records — names, emails, UUIDs, dates, and more. 0 dependency.

Convert MongoDB Extended JSON (EJSON) between Canonical and Relaxed forms, or strip BSON wrappers to plain JSON. Recognizes 16 wrapper types ($oid/$date/$numberLong/$numberDecimal/$binary/...).

Check the WCAG contrast ratio between two colors. Pass/fail for AA Normal/Large + AAA Normal/Large with a live sample.

Generate a palette from a single base color — shades, tints, complement, analogous, triad, tetrad. HSL-based. 0 dependency.

Build linear, radial, and conic CSS gradients with color stops + angle/position. Live preview + copy-ready CSS.

Four modes — duration between two dates, date ± N days, days → Y/M/D breakdown, and a persistent D-day list.