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All tools
174 utilities across 15 categories — converters, formatters, generators, and calculators. Most run entirely in your browser.
Video Editor
Arrange, trim, and join multiple clips into one video — a full multi-track editor, right in your browser.
open the editor →★ most used
Format, validate & minify JSON with instant error detection.
browserEncode and decode Base64 for text and files, both directions.
browserDecode a token's header, payload & signature — locally, never sent.
browserGenerate v1, v4 & v7 UUIDs, in bulk if you need.
browserConvert between Unix timestamps and human-readable dates.
browserLive regular-expression matching with a built-in cheatsheet.
browserGenerate realistic mock data (names, emails, addresses…) as JSON, CSV or SQL.
browserBuild linear, radial & conic CSS gradients with live preview and copyable CSS.
browserLook up A, AAAA, MX, TXT, NS & CNAME records for any domain.
serverInspect a site’s TLS certificate: issuer, expiry, SANs & chain.
serverConvert between JSON, YAML, TOML, XML & CSV in your browser.
browserWrite and run Go in a secure sandbox — compile & execute online.
sandboxRun Python entirely in your browser (Pyodide/WASM) — no server.
browserRun SQLite queries in your browser (sql.js/WASM) — no server.
browserGenerate TypeScript, Go structs or Python dataclasses from JSON.
browserExplore JSON as a collapsible tree, or diff two JSON documents.
browserConvert length, weight & temperature between common units.
browserGenerate and verify bcrypt password hashes with adjustable cost.
browserBeautify or minify JavaScript code in the browser.
browserFormat & prettify SQL queries across many dialects.
browserEncrypt & decrypt text with a password (AES-256-GCM).
browserConvert a cURL command to JavaScript, Python, Go or PHP.
browserBuild cron expressions and see them explained in plain English.
browserGenerate SEO meta tags for the <head> of your pages.
browserGenerate a QR code to share WiFi credentials — scan to connect.
browserConvert a time across multiple time zones, DST-aware.
browserA searchable reference of HTTP status codes and meanings.
browserCalculate network, broadcast, host range & mask from an IP/CIDR.
browserConvert images between PNG, JPEG and WebP in your browser.
browserShrink image file size with an adjustable quality slider.
browserTranspile TypeScript to JavaScript right in your browser.
browserCombine multiple PDFs into one, in any order.
browserScore an IP 0–100 for risk: Tor, VPN, proxy, datacenter & blocklist signals — with every point explained.
serverCheck if a host is reachable and measure connection latency.
serverCheck if a DNS change has propagated across public resolvers.
serverConvert between currencies using live European Central Bank rates.
serverSend HTTP requests with any method, headers, and body — no CORS limits.
serverGet a unique URL and inspect any HTTP requests sent to it in real time.
serverWrite and run JavaScript or TypeScript in your browser, with console output.
browserImage & Media
Turn a video into a high-quality animated GIF with full palette control.
serverChange a video resolution — presets or custom width and height.
serverStrip a video audio track, or swap in a new one.
serverGrab a still frame, or pull frames every N seconds as a ZIP.
serverCut a clip from any video — lossless and instant, or frame-exact.
serverConvert video between MP4, WebM, MOV and MKV in your browser-free workflow.
serverShrink video file size with quality presets — share and upload faster.
serverPull the audio track out of any video as MP3, AAC, WAV or FLAC.
serverConvert images between PNG, JPEG and WebP in your browser.
browserShrink image file size with an adjustable quality slider.
browserResize images by pixels or percentage, with aspect lock.
browserStrip metadata, round coordinates & minify SVG markup.
browserGenerate all standard favicon sizes from one image.
browserEncode images to base64 data URLs and decode them back.
browserClick an image to sample pixel colors and extract a palette.
browserView photo EXIF metadata and strip GPS/personal data.
browserFormatters
Format, validate & minify JSON with instant error detection.
browserBeautify or minify JavaScript code in the browser.
browserBeautify or minify CSS in the browser.
browserBeautify or minify HTML markup in the browser.
browserFormat & prettify SQL queries across many dialects.
browserFormat & validate XML, or minify it to one line.
browserValidate and tidy YAML, with optional key sorting.
browserQuickly re-indent PHP code with brace-aware formatting.
browserObfuscate JavaScript to deter casual reading (3 levels).
browserCrypto & Encoding
Encode and decode Base64 for text and files, both directions.
browserPercent-encode or decode URLs and query components.
browserDecode a token's header, payload & signature — locally, never sent.
browserMD5, SHA-1, SHA-256, SHA-512 hashes of text, in your browser.
browserEncrypt & decrypt text with a password (AES-256-GCM).
browserGenerate RSA public/private key pairs in PEM format.
browserCompute MD5/SHA hashes of any file and verify checksums.
browserDecode PEM certificates — subject, issuer, validity, fingerprint.
browserGenerate & verify Argon2id password hashes in the browser.
browserGenerators
Generate v1, v4 & v7 UUIDs, in bulk if you need.
browserStrong random passwords with length & character controls.
browserTest any password locally: entropy, crack-time estimate & tips.
browserTurn text, URLs or contact info into a downloadable QR code.
browserGenerate realistic mock data (names, emails, addresses…) as JSON, CSV or SQL.
browserGenerate Luhn-valid test card numbers by brand, plus a Luhn validator.
browserGenerate secure random tokens & API keys with your crypto RNG.
browserGenerate sortable, URL-safe ULIDs (an alternative to UUIDs).
browserCompute HMAC signatures (SHA-1/256/384/512) from a key & message.
browserGenerate and verify bcrypt password hashes with adjustable cost.
browserGenerate live 2FA (TOTP) codes from a base32 secret — RFC 6238.
browserGenerate placeholder text by paragraphs, sentences or words.
browserGenerate realistic mock user-record JSON for testing & demos.
browserTurn any text into a clean URL slug, with accent stripping.
browserGenerate a QR code to share WiFi credentials — scan to connect.
browserGenerate & validate BIP39 mnemonic seed phrases (12–24 words).
browserGenerate Apache .htpasswd entries (bcrypt or SHA-1).
browserConverters
Convert between Unix timestamps and human-readable dates.
browserTranslate text to Morse code and back, with audio playback.
browserConvert text to binary, octal, decimal or hex code points and back.
browserConvert JSON into XML or TOML, in your browser.
browserCompress or decompress text with gzip/deflate and see the size saved.
browserConvert colors between HEX, RGB, HSL and preview them.
browserConvert between JSON, YAML, TOML, XML & CSV in your browser.
browserEncode & decode HTML entities (named or numeric).
browserConvert between binary, octal, decimal & hexadecimal.
browsercamelCase, snake_case, kebab-case, PascalCase & more.
browserGenerate TypeScript, Go structs or Python dataclasses from JSON.
browserConvert Markdown to HTML and HTML back to Markdown.
browserConvert a cURL command to JavaScript, Python, Go or PHP.
browserConvert HTML to React JSX (className, style objects, self-closing).
browserConvert between a JSON array and line-delimited JSON (JSONL).
browserConvert between .env files and JSON objects.
browserConvert between numbers and Roman numerals (both ways).
browserSpell text using the NATO phonetic alphabet (Alpha, Bravo…).
browserConvert CSV to an HTML table, Markdown table, or preview grid.
browserText & Strings
Live regular-expression matching with a built-in cheatsheet.
browserCompare two blocks of text and highlight the differences.
browserCount words, characters, sentences & reading time.
browserWrite Markdown and see the rendered HTML live, side by side.
browserRemove duplicate lines and count how often each line occurs.
browserPull emails, URLs, IPs, numbers or hashtags out of any block of text.
browserSearch emoji by name or keyword and click to copy.
browserExplore JSON as a collapsible tree, or diff two JSON documents.
browserFind and replace text with optional regex and capture groups.
browserSort lines, remove duplicates, trim, and reverse text lists.
browserEscape & unescape strings for JSON, JS, HTML, SQL, URL, CSV, shell.
browserRecursively sort JSON object keys alphabetically.
browserTrim lines, collapse spaces & blank lines, convert tabs.
browserStrip HTML tags, decode entities, and remove punctuation.
browserJoin lines into one line or split a line into many, with options.
browserEveryday
Calculate loan EMIs with total interest and amortization.
browserAdd or remove GST at any rate, with inclusive/exclusive split.
browserCalculate fixed & recurring deposit maturity and interest.
browserPercentages, “X is what % of Y”, and discount calculations.
browserFind exact age in years, months, days — plus next birthday.
browserBody Mass Index from height & weight (metric or imperial).
browserDays between two dates, or add/subtract days from a date.
browserCalculate tip and split the bill between any number of people.
browserA precise stopwatch with laps, plus a countdown timer.
browserUnits & Math
Solve width or height for any aspect ratio, with common presets.
browserConvert length, weight & temperature between common units.
browserConvert area, volume and speed across metric & imperial units.
browserConvert bytes, KB/MB/GB (SI) and KiB/MiB/GiB (binary).
browserConvert px, em, rem, pt & % with configurable font-size bases.
browserConvert a time across multiple time zones, DST-aware.
browserConvert angle, pressure, and energy units.
browserConvert between currencies using live European Central Bank rates.
serverSysadmin & CLI
Find the MIME (media) type for any file extension, and vice-versa.
browserToggle Unix permissions and get the octal & symbolic chmod values.
browserBuild cron expressions and see them explained in plain English.
browserA searchable reference of the most useful git commands.
browserConvert a docker run command into a docker-compose.yml service.
browserPick safe random ports, skipping well-known service ports.
browserDesign & Color
Build linear, radial & conic CSS gradients with live preview and copyable CSS.
browserLayer CSS box-shadows with live preview — offset, blur, spread, inset.
browserGenerate a 50–900 lightness scale from a base color, like a design-system palette.
browserDrag a cubic-bezier easing curve and preview the animation, with CSS output.
browserFind the closest CSS named colors to any hex value, ranked by distance.
browserSee how colors & images look with each type of color vision deficiency.
browserPreview curated Google Font heading & body pairings with live editable text.
browserCheck WCAG AA/AAA contrast between text and background, with live preview.
browserGenerate harmonious palettes from a base color — preview & export CSS/Tailwind/JSON.
browserNetwork
Look up A, AAAA, MX, TXT, NS & CNAME records for any domain.
serverClassify an IP, reverse-DNS it, and locate it geographically.
serverFetch any URL and inspect its status and response headers.
serverInspect a site’s TLS certificate: issuer, expiry, SANs & chain.
serverLook up registration details for any domain via WHOIS.
serverCalculate network, broadcast, host range & mask from an IP/CIDR.
browserConvert IPv4/IPv6 between decimal, hex, binary and notations.
browserGenerate random MAC addresses or look up a vendor (OUI).
browserParse a user-agent string into browser, OS, engine & device.
browserFind the PTR (reverse DNS) record for an IP address.
serverCheck whether an IPv4 address is on public spam/abuse blocklists.
serverScore an IP 0–100 for risk: Tor, VPN, proxy, datacenter & blocklist signals — with every point explained.
serverCheck a domain’s email authentication — SPF, DKIM & DMARC — and flag misconfigurations.
serverResolve a domain’s MX records, mail-server IPs, and test SMTP reachability.
serverFull certificate chain, protocol & cipher strength, and a security grade for any HTTPS host.
serverDetect the tech stack behind any site — server, framework, CMS, analytics.
serverCheck if a host is reachable and measure connection latency.
serverCheck which common service ports are open on a host.
serverCheck if a DNS change has propagated across public resolvers.
serverFollow a URL's redirect chain and see every hop.
serverCheck whether a domain name appears to be registered or free.
serverAPI & Web Dev
Test whether an origin is allowed by a URL’s CORS policy.
serverA searchable reference of HTTP status codes and meanings.
browserQuery JSON with JSONPath expressions and see live matches.
browserTest XPath expressions against XML and see matched nodes.
browserBuild an HTTP request and export it as cURL, fetch, Python or Go.
browserParse an OpenAPI/Swagger spec into a readable endpoint list.
browserGenerate realistic mock JSON API responses from a schema.
browserSend HTTP requests with any method, headers, and body — no CORS limits.
serverTest APIs with environment variables and saved requests, proxied server-side.
serverGet a unique URL and inspect any HTTP requests sent to it in real time.
serverPlaygrounds & Compilers
Write and run Go in a secure sandbox — compile & execute online.
sandboxCompile and run C in a secure online sandbox (gcc).
sandboxCompile and run C++ in a secure online sandbox (g++).
sandboxCompile and run Java in a secure online sandbox (OpenJDK).
sandboxCompile and run Rust in a secure online sandbox (rustc).
sandboxRun Python entirely in your browser (Pyodide/WASM) — no server.
browserRun SQLite queries in your browser (sql.js/WASM) — no server.
browserTranspile TypeScript to JavaScript right in your browser.
browserCompile JSX to plain JavaScript with Babel.
browserCompile SCSS/Sass to CSS with Dart Sass in your browser.
browserWrite and run Lua 5.4 code in your browser via WebAssembly.
browserWrite and run JavaScript or TypeScript in your browser, with console output.
browserWrite and run Ruby code in a secure sandbox on utly's server.
sandboxWrite and run PHP code in a secure sandbox on utly's server.
sandboxWrite and run C# code (.NET) in a secure sandbox on utly's server.
sandboxSEO & Web
Generate SEO meta tags for the <head> of your pages.
browserGenerate Open Graph & Twitter card tags with a live preview.
browserBuild a robots.txt and test whether a URL is allowed or blocked.
browserScan a page and find broken (dead) links — checked from utly’s server.
serverAutomated WCAG 2 A/AA accessibility audit of any page via axe-core.
serverFind when a domain was registered and how old it is.
serverCapture a full-page or viewport screenshot of any public website.
server