All tools

Format, validate & minify JSON with instant error detection.

Encode and decode Base64 for text and files, both directions.

Decode a token's header, payload & signature — locally, never sent.

Generate v1, v4 & v7 UUIDs, in bulk if you need.

Convert between Unix timestamps and human-readable dates.

Live regular-expression matching with a built-in cheatsheet.

Generate realistic mock data (names, emails, addresses…) as JSON, CSV or SQL.

Build linear, radial & conic CSS gradients with live preview and copyable CSS.

Look up A, AAAA, MX, TXT, NS & CNAME records for any domain.

Inspect a site’s TLS certificate: issuer, expiry, SANs & chain.

Convert between JSON, YAML, TOML, XML & CSV in your browser.

Write and run Go in a secure sandbox — compile & execute online.

Run Python entirely in your browser (Pyodide/WASM) — no server.

Run SQLite queries in your browser (sql.js/WASM) — no server.

Generate TypeScript, Go structs or Python dataclasses from JSON.

Explore JSON as a collapsible tree, or diff two JSON documents.

Convert length, weight & temperature between common units.

Generate and verify bcrypt password hashes with adjustable cost.

Beautify or minify JavaScript code in the browser.

Format & prettify SQL queries across many dialects.

Encrypt & decrypt text with a password (AES-256-GCM).

Convert a cURL command to JavaScript, Python, Go or PHP.

Build cron expressions and see them explained in plain English.

Generate SEO meta tags for the <head> of your pages.

Generate a QR code to share WiFi credentials — scan to connect.

Convert a time across multiple time zones, DST-aware.

A searchable reference of HTTP status codes and meanings.

Calculate network, broadcast, host range & mask from an IP/CIDR.

Convert images between PNG, JPEG and WebP in your browser.

Shrink image file size with an adjustable quality slider.

Transpile TypeScript to JavaScript right in your browser.

Combine multiple PDFs into one, in any order.

Score an IP 0–100 for risk: Tor, VPN, proxy, datacenter & blocklist signals — with every point explained.

Check if a host is reachable and measure connection latency.

Check if a DNS change has propagated across public resolvers.

Convert between currencies using live European Central Bank rates.

Send HTTP requests with any method, headers, and body — no CORS limits.

Get a unique URL and inspect any HTTP requests sent to it in real time.

Write and run JavaScript or TypeScript in your browser, with console output.

Turn a video into a high-quality animated GIF with full palette control.

Change a video resolution — presets or custom width and height.

Strip a video audio track, or swap in a new one.

Grab a still frame, or pull frames every N seconds as a ZIP.

Cut a clip from any video — lossless and instant, or frame-exact.

Convert video between MP4, WebM, MOV and MKV in your browser-free workflow.

Shrink video file size with quality presets — share and upload faster.

Pull the audio track out of any video as MP3, AAC, WAV or FLAC.

Convert images between PNG, JPEG and WebP in your browser.

Shrink image file size with an adjustable quality slider.

Resize images by pixels or percentage, with aspect lock.

Strip metadata, round coordinates & minify SVG markup.

Generate all standard favicon sizes from one image.

Encode images to base64 data URLs and decode them back.

Click an image to sample pixel colors and extract a palette.

View photo EXIF metadata and strip GPS/personal data.

Format, validate & minify JSON with instant error detection.

Beautify or minify JavaScript code in the browser.

Beautify or minify CSS in the browser.

Beautify or minify HTML markup in the browser.

Format & prettify SQL queries across many dialects.

Format & validate XML, or minify it to one line.

Validate and tidy YAML, with optional key sorting.

Quickly re-indent PHP code with brace-aware formatting.

Obfuscate JavaScript to deter casual reading (3 levels).

Encode and decode Base64 for text and files, both directions.

Percent-encode or decode URLs and query components.

Decode a token's header, payload & signature — locally, never sent.

MD5, SHA-1, SHA-256, SHA-512 hashes of text, in your browser.

Encrypt & decrypt text with a password (AES-256-GCM).

Generate RSA public/private key pairs in PEM format.

Compute MD5/SHA hashes of any file and verify checksums.

Decode PEM certificates — subject, issuer, validity, fingerprint.

Generate & verify Argon2id password hashes in the browser.

Generate v1, v4 & v7 UUIDs, in bulk if you need.

Strong random passwords with length & character controls.

Test any password locally: entropy, crack-time estimate & tips.

Turn text, URLs or contact info into a downloadable QR code.

Generate realistic mock data (names, emails, addresses…) as JSON, CSV or SQL.

Generate Luhn-valid test card numbers by brand, plus a Luhn validator.

Generate secure random tokens & API keys with your crypto RNG.

Generate sortable, URL-safe ULIDs (an alternative to UUIDs).

Compute HMAC signatures (SHA-1/256/384/512) from a key & message.

Generate and verify bcrypt password hashes with adjustable cost.

Generate live 2FA (TOTP) codes from a base32 secret — RFC 6238.

Generate placeholder text by paragraphs, sentences or words.

Generate realistic mock user-record JSON for testing & demos.

Turn any text into a clean URL slug, with accent stripping.

Generate a QR code to share WiFi credentials — scan to connect.

Generate & validate BIP39 mnemonic seed phrases (12–24 words).

Generate Apache .htpasswd entries (bcrypt or SHA-1).

Convert between Unix timestamps and human-readable dates.

Translate text to Morse code and back, with audio playback.

Convert text to binary, octal, decimal or hex code points and back.

Convert JSON into XML or TOML, in your browser.

Compress or decompress text with gzip/deflate and see the size saved.

Convert colors between HEX, RGB, HSL and preview them.

Convert between JSON, YAML, TOML, XML & CSV in your browser.

Encode & decode HTML entities (named or numeric).

Convert between binary, octal, decimal & hexadecimal.

camelCase, snake_case, kebab-case, PascalCase & more.

Generate TypeScript, Go structs or Python dataclasses from JSON.

Convert Markdown to HTML and HTML back to Markdown.

Convert a cURL command to JavaScript, Python, Go or PHP.

Convert HTML to React JSX (className, style objects, self-closing).

Convert between a JSON array and line-delimited JSON (JSONL).

Convert between .env files and JSON objects.

Convert between numbers and Roman numerals (both ways).

Spell text using the NATO phonetic alphabet (Alpha, Bravo…).

Convert CSV to an HTML table, Markdown table, or preview grid.

Live regular-expression matching with a built-in cheatsheet.

Compare two blocks of text and highlight the differences.

Count words, characters, sentences & reading time.

Write Markdown and see the rendered HTML live, side by side.

Remove duplicate lines and count how often each line occurs.

Pull emails, URLs, IPs, numbers or hashtags out of any block of text.

Search emoji by name or keyword and click to copy.

Explore JSON as a collapsible tree, or diff two JSON documents.

Find and replace text with optional regex and capture groups.

Sort lines, remove duplicates, trim, and reverse text lists.

Escape & unescape strings for JSON, JS, HTML, SQL, URL, CSV, shell.

Recursively sort JSON object keys alphabetically.

Trim lines, collapse spaces & blank lines, convert tabs.

Strip HTML tags, decode entities, and remove punctuation.

Join lines into one line or split a line into many, with options.

Calculate loan EMIs with total interest and amortization.

Add or remove GST at any rate, with inclusive/exclusive split.

Calculate fixed & recurring deposit maturity and interest.

Percentages, “X is what % of Y”, and discount calculations.

Find exact age in years, months, days — plus next birthday.

Body Mass Index from height & weight (metric or imperial).

Days between two dates, or add/subtract days from a date.

Calculate tip and split the bill between any number of people.

A precise stopwatch with laps, plus a countdown timer.

Solve width or height for any aspect ratio, with common presets.

Convert length, weight & temperature between common units.

Convert area, volume and speed across metric & imperial units.

Convert bytes, KB/MB/GB (SI) and KiB/MiB/GiB (binary).

Convert px, em, rem, pt & % with configurable font-size bases.

Convert a time across multiple time zones, DST-aware.

Convert angle, pressure, and energy units.

Convert between currencies using live European Central Bank rates.

Find the MIME (media) type for any file extension, and vice-versa.

Toggle Unix permissions and get the octal & symbolic chmod values.

Build cron expressions and see them explained in plain English.

A searchable reference of the most useful git commands.

Convert a docker run command into a docker-compose.yml service.

Pick safe random ports, skipping well-known service ports.

Build linear, radial & conic CSS gradients with live preview and copyable CSS.

Layer CSS box-shadows with live preview — offset, blur, spread, inset.

Generate a 50–900 lightness scale from a base color, like a design-system palette.

Drag a cubic-bezier easing curve and preview the animation, with CSS output.

Find the closest CSS named colors to any hex value, ranked by distance.

See how colors & images look with each type of color vision deficiency.

Preview curated Google Font heading & body pairings with live editable text.

Check WCAG AA/AAA contrast between text and background, with live preview.

Generate harmonious palettes from a base color — preview & export CSS/Tailwind/JSON.

Look up A, AAAA, MX, TXT, NS & CNAME records for any domain.

Classify an IP, reverse-DNS it, and locate it geographically.

Fetch any URL and inspect its status and response headers.

Inspect a site’s TLS certificate: issuer, expiry, SANs & chain.

Look up registration details for any domain via WHOIS.

Calculate network, broadcast, host range & mask from an IP/CIDR.

Convert IPv4/IPv6 between decimal, hex, binary and notations.

Generate random MAC addresses or look up a vendor (OUI).

Parse a user-agent string into browser, OS, engine & device.

Find the PTR (reverse DNS) record for an IP address.

Check whether an IPv4 address is on public spam/abuse blocklists.

Score an IP 0–100 for risk: Tor, VPN, proxy, datacenter & blocklist signals — with every point explained.

Check a domain’s email authentication — SPF, DKIM & DMARC — and flag misconfigurations.

Resolve a domain’s MX records, mail-server IPs, and test SMTP reachability.

Full certificate chain, protocol & cipher strength, and a security grade for any HTTPS host.

Detect the tech stack behind any site — server, framework, CMS, analytics.

Check if a host is reachable and measure connection latency.

Check which common service ports are open on a host.

Check if a DNS change has propagated across public resolvers.

Follow a URL's redirect chain and see every hop.

Check whether a domain name appears to be registered or free.

Test whether an origin is allowed by a URL’s CORS policy.

A searchable reference of HTTP status codes and meanings.

Query JSON with JSONPath expressions and see live matches.

Test XPath expressions against XML and see matched nodes.

Build an HTTP request and export it as cURL, fetch, Python or Go.

Parse an OpenAPI/Swagger spec into a readable endpoint list.

Generate realistic mock JSON API responses from a schema.

Send HTTP requests with any method, headers, and body — no CORS limits.

Test APIs with environment variables and saved requests, proxied server-side.

Get a unique URL and inspect any HTTP requests sent to it in real time.

Write and run Go in a secure sandbox — compile & execute online.

Compile and run C in a secure online sandbox (gcc).

Compile and run C++ in a secure online sandbox (g++).

Compile and run Java in a secure online sandbox (OpenJDK).

Compile and run Rust in a secure online sandbox (rustc).

Run Python entirely in your browser (Pyodide/WASM) — no server.

Run SQLite queries in your browser (sql.js/WASM) — no server.

Transpile TypeScript to JavaScript right in your browser.

Compile JSX to plain JavaScript with Babel.

Compile SCSS/Sass to CSS with Dart Sass in your browser.

Write and run Lua 5.4 code in your browser via WebAssembly.

Write and run JavaScript or TypeScript in your browser, with console output.

Write and run Ruby code in a secure sandbox on utly's server.

Write and run PHP code in a secure sandbox on utly's server.

Write and run C# code (.NET) in a secure sandbox on utly's server.

Generate SEO meta tags for the <head> of your pages.

Generate Open Graph & Twitter card tags with a live preview.

Build a robots.txt and test whether a URL is allowed or blocked.

Scan a page and find broken (dead) links — checked from utly’s server.

Automated WCAG 2 A/AA accessibility audit of any page via axe-core.

Find when a domain was registered and how old it is.

Capture a full-page or viewport screenshot of any public website.

Combine multiple PDFs into one, in any order.

Extract specific pages or ranges from a PDF into a new file.

Render PDF pages to PNG or JPEG images.

Shrink a PDF by rasterizing pages — best for image-heavy or scanned files.