Web Tools
Browse all available web tools.
Available tools
- Cache Bust Query Adder Set one named cache-busting query parameter on an absolute URL while preserving other parameters and its fragment.
- Cache Control Private Field Name Token Tool Compute cache control private field name token from explicit bounded inputs.
- Cache Directive Delta Seconds Boundary Tool Compute cache directive delta seconds boundary from explicit bounded inputs.
- Canonical Link Extractor Extract canonical-link href values from HTML source, preserving source order and resolving no URLs implicitly.
- Content Disposition RFC 5987 Language Field Tool Compute content disposition rfc 5987 language field from explicit bounded inputs.
- Content Encoding Detector Parse actual DECLAREDC ontent-Encoding coding list in applied order, knowncodinginventorygzip/compress/deflate/br/zstd/identity. Does not detect bytes, sniff encoding, decompress or accept header as proof content. Empty header means none, no request.
- Content Security Policy Parser Parse one serialized CSP policy into lowercase directive names and source tokens, keeping the first occurrence of each directive.
- Content Security Policy Report Only Label Tool Compute content security policy report only label from explicit bounded inputs.
- Content Type Charset Single Parameter Tool Format a single unquoted HTTP charset parameter from an ASCII token, lowercasing its case-insensitive name.
- Cookie Domain Leading Dot Normalization Tool Calculate cookie domain leading dot normalization from explicit caller-supplied inputs.
- Cookie Host Only Domain Attribute Flag Tool Compute cookie host only domain attribute flag from explicit bounded inputs.
- Cookie Path Prefix Boundary Flag Tool Calculate cookie path prefix boundary flag from explicit caller-supplied inputs.
- Cookie Samesite None Secure Pair Tool Compute cookie samesite none secure pair from explicit bounded inputs.
- CORS Allow-Origin Checker Check only whether Access-Control-Allow-Origin matches a supplied request Origin, including the wildcard restriction for credentialed requests.
- CORS Origin Null Literal Distinction Tool Compute cors origin null literal distinction from explicit bounded inputs.
- Cross-Origin Attribute Parser Resolve an HTML crossorigin attribute to no-CORS, anonymous, or use-credentials state; an invalid present value defaults to anonymous.
- Csp Hash Source Algorithm Token Tool Compute csp hash source algorithm token from explicit bounded inputs.
- CSP Host Source Subdomain Wildcard Pair Tool Check only a lowercase ASCII host subdomain wildcard; scheme, port and path matching are outside this fragment.
- Csp Nonce Source Token Tool Wrap a syntactically valid CSP base64-value as a quoted nonce source token. No randomness, entropy guarantee, or policy assembly.
- CSP Wildcard Port Domain Flag Tool Compare a CSP port selector with an explicit or default destination port; scheme, host and path matching are separate operations.
- Csp Wildcard Port Source Token Tool Compute csp wildcard port source token from explicit bounded inputs.
- Data URI Base64 Marker Position Tool Calculate data uri base64 marker position from explicit caller-supplied inputs.
- Data URI Default Media Type Token Tool Calculate data uri default media type token from explicit caller-supplied inputs.
- Data URI Size Count decoded payload bytes in a canonical ASCII data URI with percent escapes or standard padded Base64; this does not fetch or render its content.
- Data URL Parser Parse a data URL into its media-type declaration, Base64 flag, and decoded byte sequence without guessing a text encoding.
- Decoding Attribute Validator Check whether an image decoding attribute uses a recognized sync, async, or auto keyword.
- DnsPrefetchHintParser Extract dns-prefetch link hints from HTML source without fetching, validating browser support, or resolving their hrefs.
- Email HTML Entity Obfuscator Encode each email-address code point as a decimal HTML character reference for presentation, without claiming spam protection.
- Extension Lookup Bounded off line10common MIME type→preferred extension inventory; optional parameters ignored, not all valid alternate extensions or MIME security/content verification.
- Fetch Priority Attribute Validator Check whether a fetchpriority attribute uses the recognized high, low, or auto keyword.
- Form URL-Encoded Decoder Decode ordered UTF-8 application/x-www-form-urlencoded pairs, preserving duplicate names and treating plus signs as spaces.
- Form URL-Encoded Encoder Serialize ordered UTF-8 name/value string pairs in application/x-www-form-urlencoded form, using plus signs for spaces.
- HSTS Include Sub Domains Flag Tool Detect a standalone case-insensitive includeSubDomains directive in an HSTS field value; this is not a complete HSTS policy validator.
- HTTP Age Cache Freshness Residual Tool Calculate http age cache freshness residual from explicit caller-supplied inputs.
- HTTP Allow Header Single Method Token Tool Compute http allow header single method token from explicit bounded inputs.
- HTTP Cache Control Maxstale Unbounded Token Tool Calculate http cache control maxstale unbounded token from explicit caller-supplied inputs.
- HTTP Content Encoding Order Index Tool Calculate http content encoding order index from explicit caller-supplied inputs.
- HTTP Content Length Decimal Parser Parse Content-Length as exact unsigned ASCII decimal text without unsafe numeric conversion, signs, whitespace or exponent syntax.
- HTTP Content Length Leading Zero Canonicalizer Tool Compute http content length leading zero canonicalizer from explicit bounded inputs.
- HTTP Content Length List Consistency Audit comma-combined Content-Length decimal members for exact numeric consistency after OWS trimming; does not accept empty members.
- HTTP Content Range Length Consistency Tool Calculate http content range length consistency from explicit caller-supplied inputs.
- HTTP Content Range Unsatisfied Total Tool Compute http content range unsatisfied total from explicit bounded inputs.
- HTTP Contenttype Boundary Quote Policy Tool Compute http contenttype boundary quote policy from explicit bounded inputs.
- HTTP Cookie Duplicate Path Tie Token Tool Order eligible same-name cookies by longer supplied path then earlier creation; request applicability is supplied, not inferred.
- HTTP Date IMF Fixdate Zone Token Tool Compute http date imf fixdate zone token from explicit bounded inputs.
- HTTP Date Precision Tie Tool Compare already-normalized whole-second HTTP date values, without parsing obsolete date formats.
- HTTP Etag Weak Strong Comparison Pair Tool Calculate http etag weak strong comparison pair from explicit caller-supplied inputs.
- HTTP Field Line Folding Audit Audit obsolete field folding and bare CR/LF in a supplied header block; does not normalize potentially ambiguous HTTP framing.
- HTTP Forwarded Quoted Address Token Tool Quote an already supplied IPv6 address token and explicit port in a Forwarded for parameter; this is not a complete IPv6 validator.
- HTTP If None Match Wildcard Token Tool Calculate http if none match wildcard token from explicit caller-supplied inputs.
- HTTP Media Type Structured Suffix Extract the final structured subtype suffix after validating the complete Content-Type through the existing parser; no IANA registration claim.
- HTTP Method Case Sensitivity Tag Tool Compute http method case sensitivity tag from explicit bounded inputs.
- HTTP Parameter Name Duplicate Audit Audit case-insensitive HTTP parameter-name duplicates using the existing quote-aware parameter parser; accepts a parameter list, not a whole header.
- HTTP Quality Thousandths Formatter Format integer quality thousandths as a minimal RFC qvalue spelling between zero and one.
- HTTP Quality Thousandths Parser Parse strict HTTP qvalue syntax into exact integer thousandths; no signs, exponent, whitespace or more than three decimals.
- HTTP Quoted String Escaper Escape a string as an HTTP quoted-string, quoting backslash and double quote; reject CR/LF, other controls and non-octet Unicode.
- HTTP Quoted String Unescaper Strictly unescape one HTTP quoted-string with ASCII/obs-text validation; reject dangling escapes, CR/LF and unquoted input.
- HTTP Range Complete Overlap Witness Tool Witness complete containment of an inclusive byte range; zero witness endpoints are unused when containment is false.
- HTTP Range Invalid Endpoint Order Tool Compute http range invalid endpoint order from explicit bounded inputs.
- HTTP Retry After Delta Date Token Tool Compute http retry after delta date token from explicit bounded inputs.
- HTTP Sec Fetch Site One Token Tool Calculate http sec fetch site one token from explicit caller-supplied inputs.
- HTTP Token Character Audit Audit HTTP token characters and zero-based Unicode scalar positions; an empty token is invalid even with no offending character.
- HTTP Vary Header Star Dominance Tool Calculate http vary header star dominance from explicit caller-supplied inputs.
- Image Srcset Parser Parse srcset candidates with positive width or density descriptors, rejecting mixed descriptor types and preserving commas within URL tokens.
- Import Map Parser Parse imports and scopes from import-map JSON into portable entries, preserving null addresses and leaving URL resolution to the caller.
- Integrity Attribute Parser Split integrity metadata into supported SHA algorithm tokens, digest text, and options, reporting unsupported or malformed tokens separately.
- JSON-LD Structured Data Extractor Extract valid application/ld+json script documents from HTML as normalized JSON strings, without resolving remote contexts.
- Link Relation Extension URI Label Tool Compute link relation extension uri label from explicit bounded inputs.
- LinkPreloadDetector Extract preload link hints from HTML source without fetching, validating browser support, or resolving their hrefs.
- Loading Attribute Validator Check whether an HTML loading attribute is one of the recognized eager or lazy keywords, ASCII case-insensitively.
- Manifest Display Validator Validate a web application manifest display keyword without treating display_override extension values as display values.
- Manifest Icon Size Parser Parse an icon sizes string into positive pixel dimensions and an explicit scalable any flag.
- ManifestStartUrlExtractor Extract the raw start_url string from manifest JSON, reporting whether it is present without applying browser fallback behavior.
- ManifestThemeColorExtractor Extract the raw theme_color string from manifest JSON, reporting whether it is present without applying browser fallback behavior.
- Meta Tag Parser Extract named meta entries from HTML source in document order, preserving repeated keys.
- Mime Type Lookup Bounded off line common file-extension MIME inventory (10explicit entries), case fold/optional one leading dot. Not a completeIANA/media-type database, content-sniffing security verdict or evidence actual bytes match label.
- ModulepreloadDetector Extract modulepreload link hints from HTML source without fetching, validating browser support, or resolving their hrefs.
- Multipart Boundary Generator Generate a reproducible multipart boundary from explicit byte values and detect collisions with supplied body text.
- Open Graph Parser Extract og metadata entries from HTML source in document order, preserving repeated keys.
- Origin Port Equivalence Tool Compare normalized HTTP(S) origin tuples including default-port normalization.
- Percent Encoding Unreserved Flag Tool Classify one ASCII byte under the RFC 3986 unreserved set.
- Permissions Policy Parser Parse feature allowlists from Permissions-Policy dictionary syntax, supporting wildcard, self, and quoted origins without evaluating permissions.
- PreconnectHintParser Extract preconnect link hints from HTML source without fetching, validating browser support, or resolving their hrefs.
- PrerenderHintParser Extract prerender link hints from HTML source without fetching, validating browser support, or resolving their hrefs.
- Punycode Domain Decoder Decode xn-- domain labels using RFC 3492 without claiming DNS registration or Unicode confusable safety.
- Referrer Attribute Parser Parse ONEHTML referrer policy attribute enumonly, unknown/empty means no explicit recognized policy. Not comma-separated HTTP header last token selection, default document policy, actual ReferrerURLor network decision.
- Referrer Extractor ExtractactualRefererfieldfrom supplied raw request header lines only; singleabsoluteHTTP(S) branch, no fetch, Referrer-Policy decision or trust/authenticity inferred from spoof able header.
- Referrer Policy Parser Select the last recognized token from a comma-separated Referrer-Policy header while preserving an empty result if none is recognized.
- Robots Allow Checker Evaluate supplied robots.txt groups for an exact crawler product token and path using RFC 9309 wildcard, longest-rule, and allow-tie semantics.
- Server-Sent Event Parser Parse a complete Unicode event stream into dispatched events, preserving last-event IDs and discarding an unterminated final event.
- Sitemap Entry Counter Count direct entries in a balanced XML sitemap or sitemap index with the standard namespace, rejecting DTDs and nested namespace rebinding.
- Subresource Integrity Hash Generator Hash explicit UTF-8 text with SHA-256, SHA-384, or SHA-512 and emit Base64 Subresource Integrity metadata.
- Transfer Encoding Parser Parse a simple comma-separated Transfer-Encoding coding list into lowercase HTTP tokens; extension parameters are outside this tool's scope.
- Twitter Card Parser Extract twitter metadata entries from HTML source in document order, preserving repeated keys.
- Unicode Domain to ASCII Normalize a Unicode domain using WHATWG URL IDNA processing and return its ASCII hostname without performing DNS lookup.
- URI Fragment Empty State Tool Distinguish absent, empty and nonempty literal URI fragment components without percent decoding.
- URI Query Empty Value Equals Marker Tool Calculate uri query empty value equals marker from explicit caller-supplied inputs.
- URI Query Plus Literal Policy Tool Decode one supplied query component with an explicit literal-plus versus form-space policy.
- URI Unreserved Percent Normalization Tool Calculate uri unreserved percent normalization from explicit caller-supplied inputs.
- URL Domain Calculator Actual DNS qualified registrable domain using caller independently verified applicable EXACT public suffix records, longest match. No naive last-two-label assumption, PSL wildcard/exception processing, live authority/network request; only actual expanded exact suffixes accepted, unknown host explicit.
- URL Dot Segment Event Trace Trace RFC 3986 section 5.2.4 literal URL dot-segment removal, preserving meaningful empty slash segments. Percent-encoded dots and slashes remain opaque; not complete URI reference resolution, authorization or filesystem traversal protection.
- URL Fragment Empty Marker Tool Compute url fragment empty marker from explicit bounded inputs.
- URL Hash Extract the hash of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Host Extract the host of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Hostname Extract the hostname of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Is Absolute Check whether a reference parses as an absolute WHATWG URL.
- URL Is Blob Check whether an absolute WHATWG URL uses the blob scheme.
- URL Is Data Check whether an absolute WHATWG URL uses the data scheme.
- URL Is Relative Check whether a reference needs a base URL and resolves against a hierarchical HTTPS base.
- URL Origin Extract the origin of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Password Extract the password of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Path Empty Segment Count Tool Count literal empty slash-delimited path segments with explicit endpoint inclusion; do not parse a full URL.
- URL Path Empty Segment Profile Profile raw literal URL-path empty segments without URL normalization or decoding escaped slashes.
- URL Path Prefix Token Match Check a literal raw URL-path segment prefix, retaining empty segments and rejecting accidental character-prefix matches.
- URL Path Segments Split a hierarchical absolute URL path into percent-encoded segments while preserving empty interior and trailing segments.
- URL Pathname Extract the pathname of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Port Extract the port of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Protocol Extract the protocol of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Query Count Count parsed query parameters in an absolute URL, including repeated names and empty values.
- URL Query Key Collision Audit Audit query-name collisions after form-style percent decoding; encoded spellings and duplicate source positions remain visible.
- URL Query Key Repetition Summary Summarize query-name repetition in first-seen order and retain all decoded values, including empty values.
- URL Query Pair Deletion Tool Delete every query pair whose decoded name is explicitly selected, preserving surviving raw spellings and order; output omits a leading question mark.
- URL Query Pair Order Table Parse form-style query pairs in source order, preserving raw pair spellings and duplicate names; rejects malformed percent escapes.
- URL Search Extract the search of an absolute URL using the WHATWG URL parser, including its normalization rules.
- URL Subdomain Calculator Actual DNS qualified subdomain prefix using caller independently verified applicable EXACT public suffix records, longest match. No naive last-two-label assumption, PSL wildcard/exception processing, live authority/network request; only actual expanded exact suffixes accepted, unknown host explicit.
- URL TLD Calculator LastnormalizedDNSlabelofactualabsoluteURL using existing WHATWG parser. TLD string not a registry validation, public suffix or registrable domain, IP/empty hosts rejected, no network lookup.
- URL Userinfo Last At Sign Boundary Tool Compute url userinfo last at sign boundary from explicit bounded inputs.
- URL Username Extract the username of an absolute URL using the WHATWG URL parser, including its normalization rules.
- Vary Parser Parse a Vary response header as a case-insensitive set of field names or the single wildcard value.
- Web: Cookie Maxage Vs Expiry Precedence Tool Resolve parsed cookie Max-Age precedence over Expires using supplied receipt time; absent session expiry uses unused zero and no full Set-Cookie parsing.
- Web: Etag Weakness Marker Split Tool Split a strict ASCII RFC9110 entity tag into weak marker and opaque payload; backslash is an ordinary opaque character, not a quoted-string escape.
- Web: HTTP Age Date Response Adjustment Tool Apply RFC9111 apparent-age/response-delay adjustment and resident time from explicit parsed timestamps and Age; not a cache freshness or header parser.
- Web: URL Empty Query Vs Absent Label Tool Distinguish an absent query from an explicitly present empty query in a valid absolute HTTP(S) URL, preserving lexical question marks before the fragment.
- WebSocket URL Validator Check an absolute ws, wss, http, or https URL against WebSocket constructor URL rules, excluding fragments. HTTP schemes are accepted by the constructor and mapped to WebSocket schemes.