Free online tools
Small, fast utilities for developers, designers, writers and teams. No sign-up, no limits, and nearly everything runs in your browser so your data stays with you.
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Format, encode, test and generate the things you reach for every day.
DeveloperAPI Request TesterA lightweight online API client: set method, URL, params, headers, JSON, form or raw body and bearer or basic auth, see status, time, headers and a pretty body.
DeveloperApp Icon GeneratorTurn one image into a complete iOS AppIcon set with Contents.json, Android mipmaps with an adaptive icon, and PWA icons with a manifest snippet, as one zip.
DeveloperBase64 Encode and DecodeEncode and decode Base64 text with correct UTF-8, URL-safe option and padding control. Convert files to Base64 or data URIs and turn Base64 back into files.
DeveloperBroken Link CheckerCrawl up to 50 pages of your site, check up to 300 links and see every broken link with the page it was found on, with live progress and a CSV export.
DeveloperCode Minifier and BeautifierMinify or beautify HTML, CSS and JavaScript in your browser. Shrink files for production or reformat messy code, with size savings shown.
DeveloperCron Expression BuilderBuild and decode cron expressions visually. Get plain-English text, field errors, the next 10 run times in any time zone and a crontab line.
DeveloperCSS Unit ConverterConvert px, rem, em, pt, vw, vh and percent with custom root and parent font sizes and viewport size, and read a handy conversion table.
DeveloperCSV to JSON ConverterConvert CSV to JSON and JSON to CSV in your browser with delimiter detection, header support, number typing and nested flatten or unflatten.
DeveloperDNS, SSL and Security Header CheckerLook up A, AAAA, MX, TXT, NS, CNAME and CAA records, inspect the SSL certificate chain and expiry, and grade HTTP security headers with fix hints.
DeveloperHash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes or HMACs for text or a file, entirely in your browser with WebCrypto, with hex or Base64 output.
DeveloperHeading and Alt Text CheckerFetch a page to see its H1 to H6 outline, images with missing or weak alt text, and links with empty or vague text, with an exportable CSV.
DeveloperHTML Entity Encoder and DecoderEncode text to HTML entities (named, decimal or hex) or decode entities back to characters, with a list of common symbols. Runs in your browser.
DeveloperHTML, CSS and JavaScript PlaygroundWrite HTML, CSS and JavaScript with a live sandboxed preview and console, start from templates, share by link or download a zip. Runs in your browser.
DeveloperJSON Formatter and ValidatorFormat, minify, validate and explore JSON in your browser. Pinpoints errors by line and column, sorts keys, and shows a collapsible tree. Nothing is uploaded.
DeveloperJWT DecoderDecode a JSON Web Token in your browser: see the header, payload and claims explained, exp and iat as dates, and optionally verify an HMAC signature.
DeveloperLaravel .env GeneratorPick your database, cache, queue, session, mail and filesystem drivers and get a ready .env with a secure random APP_KEY and a plain-English note for every key.
DeveloperNumber Base ConverterConvert between binary, octal, decimal, hex and any base from 2 to 36 with exact BigInt maths, and explore AND, OR, XOR, NOT and shifts in a bit view.
DeveloperOnline Notepad and Paste SharingPaste text or code, pick syntax highlighting and an expiry from 1 hour to 30 days, add a password or burn after reading, and share a private link. Free.
DeveloperPassphrase and PIN GeneratorGenerate memorable diceware-style passphrases from the EFF word list and random PINs, with entropy shown. Uses secure randomness and runs in your browser.
DeveloperPassword GeneratorGenerate strong random passwords and passphrases in your browser, with entropy, crack-time estimates, custom symbols and bulk generation.
DeveloperRedirect and HTTP Status CheckerTrace every redirect hop with its status code, Location header and timing. Check one URL or up to 20 at once and spot loops, long chains and slow hops.
DeveloperRegex TesterTest JavaScript regular expressions live: highlighted matches, capture groups, named groups, replace preview, flags and a built-in cheat sheet.
DeveloperRobots.txt and Sitemap GeneratorBuild a robots.txt with a visual rules builder and presets, then paste your URLs to get a valid sitemap.xml. Download both files, all in your browser.
DeveloperSchema Markup (JSON-LD) GeneratorGenerate JSON-LD for Organization, Local business, Product, FAQ, Article and Breadcrumb, with a validator-style preview that flags missing properties.