All Developer Tools

security

Decrypt AES online — GCM/CBC/CTR, passphrase or raw key, auto-detects OpenSSL & CryptoJS "U2FsdGVkX1" format. 100% in-browser, keys never leave the page.

security

Free online AES encryption — AES-128/192/256, GCM/CBC/CTR, passphrase (PBKDF2) or raw key. Runs 100% in your browser; nothing is uploaded.

conversion

Convert between binary, hex, decimal, octal and any base (2-36) instantly. Free, private — all processing in your browser.

encoding

Decode and encode Base64 online for free. Real-time conversion with full UTF-8 and emoji support. 100% private — runs in your browser. No signup needed.

encoding

Decode a Base64 string or data URI back into an image in your browser. Preview, read dimensions & MIME, then download as PNG, JPG, GIF, SVG. No upload.

security

Generate and verify bcrypt password hashes online — adjustable cost, $2b$/$2a$/$2y$ prefixes. 100% in your browser; your password is never uploaded.

text

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and 6 more formats instantly. Free, browser-only, no signup.

conversion

Convert Linux file permissions between octal (755, 644) and rwx symbols. Get chmod commands, spot risky settings like 777 — free, right in your browser.

conversion

Convert HEX to RGB, HSL, OKLCH, OKLAB and CMYK in your browser — copy any format with one click. Free, no signup, your colors never leave the page.

datetime

Build, validate, and decode cron expressions in your browser. Live next-run preview in local time or UTC. POSIX 5-field syntax, presets, plain-English description. Free, private, no signup.

code

Format, beautify and minify CSS instantly in your browser. Clean up messy stylesheets or compress them to ship — free, private, and your CSS never leaves your device.

encoding

Convert CSV to JSON in your browser. RFC 4180, type inference, header row, big-int safe. 100% private, no upload.

web

Build curl commands in your browser — set method, headers, auth, and body, get a copy-ready command instantly. Presets for Bearer, POST JSON, file upload. Free, private, no signup.

encoding

Paste a .env file, get JSON instantly. Your database passwords, API keys and tokens never leave your browser — 100% private, no upload, free dotenv parser.

conversion

Convert HEX colors to CMYK in your browser. Naive sRGB-based approximation for print previews. Free, no signup, your colors stay local.

conversion

Convert any hex color to HSL in your browser — 3-digit, 6-digit, 8-digit alpha all supported. Free, instant, no signup, your colors never leave the page.

conversion

Convert HEX to OKLCH for Tailwind v4 design tokens. Live perceptually-uniform output with Display P3 gamut warnings. Free, browser-only.

conversion

Convert any hex color code to RGB in your browser — 3-digit, 6-digit, and 8-digit alpha hex all supported. Free, instant, no signup, your colors never leave the page.

security

Free online HMAC generator & verifier — compute or verify HMAC-SHA256/SHA1/384/512 with Text, Hex or Base64 keys and Hex/Base64/Base64URL output. 100% in your browser; your secret key never leaves the page.

encoding

Decode HTML entities and unescape HTML online — free, no signup, 100% in your browser. Converts named, decimal & hex references back to characters; never uploaded.

encoding

Encode HTML entities and escape special characters (< > & " ') online — free, no signup, 100% in your browser. Named, decimal, or hex output; never uploaded.

code

Format, beautify and minify HTML instantly in your browser. Indent messy markup or compress it to ship — free, private, and your HTML never leaves your device.

encoding

Convert HTML to clean Markdown in your browser — GFM tables, task lists, and links. Choose ATX/Setext headings and inline or reference links. Great for migrating web content or feeding LLMs. 100% private, no upload.

web

Generate htpasswd entries with bcrypt, Apache MD5 (apr1), SHA-1 & more. Get ready-to-paste Apache, nginx & Docker config. 100% in your browser — no upload.

conversion

Convert floats to IEEE 754 hex & binary — FP16, FP32, FP64 and bfloat16. See the exact stored value, rounding error and bit layout. 100% in your browser.

conversion

Compress JPEG, PNG, WebP & AVIF up to 80% smaller — in your browser, no upload. Batch 20 images, resize, compare before & after, download as ZIP. Free & private.

encoding

Convert images to Base64 data URIs in your browser — PNG, JPG, GIF, WebP, SVG, ICO. Copy HTML, CSS, Markdown & JSON, with the exact size increase. 100% private, no upload.

code

Format, beautify and minify JavaScript instantly in your browser. Clean up messy code or compress it with Terser to ship — free, private, and your code never leaves your device.

encoding

Compare two JSON files instantly in your browser. Side-by-side highlighting, RFC 6902 JSON Patch output, ignore noisy fields like timestamps and IDs. 100% private, no upload.

encoding

Escape any text or JSON into a valid JSON string literal in your browser. Handles quotes, newlines, tabs, Unicode, and slashes. 100% private, no upload, instant.

encoding

Format, validate and beautify JSON instantly in your browser. Free online tool with syntax validation, error detection, minify and one-click copy. 100% private.

encoding

Validate JSON against any JSON Schema instantly in your browser. Supports Draft 2020-12, 2019-09, and Draft-07 with path-precise error messages. 100% private — no upload, no account, free.

encoding

Convert JSON to CSV in your browser. RFC 4180, Excel-EU, TSV, Pipe presets. Flatten nested or stringify. 100% private, no upload.

encoding

Paste a JSON object, get a .env file instantly. Generate dotenv from config locally — your keys and secrets never leave your browser. 100% private, no upload.

encoding

Paste JSON, get Python classes instantly — dataclass, Pydantic v2, or TypedDict. Correct Optional typing, camelCase aliases, nested classes. 100% in your browser, free.

encoding

Paste JSON, get idiomatic Rust serde structs instantly, 100% in your browser. Correct i64/u64/f64 typing, Option for nulls, #[serde(rename)] for camelCase. Free.

encoding

Paste JSON, get TOML instantly in your browser. Safe null handling, top-level table checks, Cargo.toml & pyproject.toml-ready output. 100% private, no upload.

encoding

Paste JSON, get TypeScript interfaces instantly. 100% in your browser — data never leaves the page. interface or type, nested objects, arrays, optional fields. Free, no sign-up.

encoding

Paste JSON, get XML instantly. Converts objects, arrays, and @_ attributes in-browser — nothing uploaded. Free, private, no signup required.

encoding

Paste JSON, get YAML instantly. Live conversion in your browser. K8s/Compose-ready, 2/4-space indent, smart quoting. 100% private, no upload.

encoding

Paste JSON, get a ready-to-use Zod schema instantly, 100% in your browser. Correct z.number().int(), .optional() and .nullable(), plus a z.infer type. Free.

encoding

Unescape a JSON string back to readable text in your browser. Decodes \n, \t, \", \\, and \uXXXX, with or without surrounding quotes. 100% private, no upload.

encoding

Test JSONPath expressions against any JSON, 100% private in your browser — no upload, no signup, no eval. RFC 9535 standard engine plus Classic Goessner mode, with Values, Paths and Both result views.

security

Decode JWT tokens online with our free JWT decoder. Instantly inspect header, payload, signature, expiration, algorithm, and claims. 100% browser-based — your token never leaves your device. No signup, no tracking.

security

Free online JWT generator & encoder. Build the header and payload, sign with HS256, RS256, or ES256 instantly. 100% in-browser — your secret and key never leave your device.

security

Generate a strong, RFC-correct JWT secret for HS256/384/512 — 100% in your browser, never sent to a server. base64url, base64 or hex; copy for .env.

conversion

Convert between 16 length units instantly — metric, imperial, nautical & astronomical. 1 inch = 2.54 cm. Free, private, runs in your browser.

text

Generate Lorem Ipsum placeholder text instantly — by paragraph, sentence, word, byte, or list. Copy or download as plain text, HTML, Markdown, or JSON. 100% free, private, in-browser. No sign-up.

encoding

Convert Markdown to HTML in your browser — full GitHub Flavored Markdown, live preview, syntax highlighting. Export an HTML fragment, full document, or email-safe inline-styled HTML. 100% private, no upload.

security

Generate MD5, SHA-256, SHA-1 & SHA-512 hashes online for free. Hash text or files in your browser, verify checksums and copy results. No signup needed.

web

Generate Open Graph, Twitter Card & SEO meta tags with a live Google, Facebook & X preview. 100% free, in-browser, no signup — copy & paste the code.

web

See which nginx location block wins — and why every other block lost. Free location match tester for =, ^~, ~ and ~*, running entirely in your browser.

conversion

Convert px to rem instantly. 16px = 1rem at the default base, plus any custom root font-size. Free, live two-way conversion that runs 100% in your browser.

encoding

Free QR code generator. Make static QR codes for URL, WiFi, vCard, email & SMS. SVG & PNG download. No expiration, no signup, 100% in your browser.

security

Generate strong random passwords instantly — free, 100% in your browser. Customize length & characters, batch up to 50 with entropy analysis.

text

Test regex patterns instantly against any text. Live match highlighting, capture groups, replace preview, split, and pattern explainer. JavaScript-flavor regex, 100% private, no signup.

conversion

Convert rem to px instantly. 1rem = 16px at the default base, plus any custom root font-size. Free, live two-way conversion that runs 100% in your browser.

text

Remove duplicate lines from text online — free, instant, 100% in your browser. Ignore case or whitespace, keep first or last occurrence, and see how many duplicates were removed. Also sort and clean up. No signup.

conversion

Convert RGB to hex in your browser — integers, percentages, and rgba alpha all supported. Free, instant, no signup, your colors never leave the page.

security

Generate SHA-1 hashes in your browser — 40-character hex output, no upload. Legacy tool for Git fingerprints, old certificate checks, and migration audits. Data never leaves your device.

security

Generate SHA-256 hashes online for free. Hash text or files in your browser, verify checksums, and copy 64-character hex output. No signup; data never leaves the page.

security

Generate SHA-3 hashes online free. NIST FIPS 202 sponge construction — the post-SHA-2 standard. SHA3-256 output in 64 hex chars. Browser-only via lazy-loaded js-sha3; zero uploads.

security

Generate SHA-384 hashes online — 96-character hex output, length-extension immune, NSA Suite B compliant. Paired with AES-256-GCM in TLS. All hashing runs in your browser via Web Crypto API.

security

Generate SHA-512 hashes online — 128 hex chars output, faster than SHA-256 on 64-bit CPUs. Ideal for long-term archives, LUKS key derivation, and HMAC-SHA-512. Browser-only, zero uploads.

text

Slugify any title into a clean, SEO-friendly URL slug instantly. Transliterate accents and Cyrillic, or keep Unicode letters. 100% private, in your browser.

text

Sort text lines alphabetically, numerically (natural order), or by length — ascending or descending. Free online line sorter, 100% in your browser. Also dedupe, reverse, and clean up lists. No signup, nothing uploaded.

code

Format, beautify and minify SQL instantly in your browser. Supports PostgreSQL, MySQL, SQL Server, BigQuery, Snowflake, Oracle & SQLite. Free, private — your SQL never leaves your device.

conversion

Convert Celsius, Fahrenheit, Kelvin and Rankine instantly. Free online browser-based tool with conversion formulas, step-by-step guides and reference charts.

text

Compare two texts instantly in your browser. Side-by-side view with inline word-level highlights, unified-diff export, ignore case / whitespace / blank lines. 100% private — your text never leaves your device.

encoding

Paste TOML, get JSON instantly in your browser. Cargo.toml, pyproject.toml & config.toml ready. Dates and nested tables handled right. 100% private, no upload.

security

Generate a TOTP/2FA code from a Base32 secret instantly — 100% in your browser, your secret never leaves your device. QR setup + code verify. Free, no signup.

web

Stop counting hex digits. Free online traceparent decoder — runs in your browser, nothing uploaded. Trace ID, span ID, all 8 trace-flags bits, tracestate check, Datadog/X-Ray/B3 conversion.

security

Generate, decode, and convert ULIDs online — free and 100% in your browser. Extract the embedded timestamp from any ULID, convert ULID to UUID and back, batch-generate, with a monotonic mode. Nothing is ever sent to a server.

datetime

Convert Unix timestamps to dates instantly. Auto-detects seconds, milliseconds & microseconds. Live clock, bidirectional. Free & private.

encoding

Decode or encode URLs in real time with built-in URL parser. Dual mode: encodeURI & encodeURIComponent. 100% private, no data sent to any server.

security

Free UUID generator — create v1, v4, v5, v7 UUIDs instantly. Decode & validate any UUID. Batch generate up to 50. No signup, 100% browser-based.

conversion

Convert volume & liquid capacity between 15 units — metric, US customary, imperial & cooking. Free online converter, 100% private, runs in your browser.

conversion

Convert weight between 13 units instantly — metric, imperial & troy. Conversion tables, formulas & references. Free, runs in your browser.

text

Count words, characters, sentences, paragraphs, and reading time instantly. Real-time word counter with Twitter, meta description, and Instagram limit checks. Free, private, no signup.

encoding

Beautify, minify, and validate XML in-browser — nothing uploaded. Re-indents messy XML, reports well-formedness errors with line/column. Free, private, no signup.

encoding

Paste XML, get JSON instantly. Converts attributes to @_ keys, handles repeated elements as arrays. 100% in-browser, nothing uploaded, no signup.

encoding

Paste YAML, get JSON instantly. Live conversion in your browser. K8s manifests, OpenAPI specs, helm values supported. 100% private, no upload.