Development aid

Quick navigation across every route: the page itself is public.

All routes

Every page on the site, grouped the way the router sees them.

Main
HomeCatalog-driven landing page/ (/) AboutWhat Nutter Tools is and how it works/about (/about) ContactEmail routes for privacy and legal inquiries/contact (/contact) SettingsTheme and contrast preferences/settings (/settings)

Images
ImagesImage tools hub/images (/images) ConvertImage format conversion/images/convert (/images/convert) CompressImage compression/images/compress (/images/compress) ResizeImage resizing/images/resize (/images/resize) Format SupportWhich image formats this browser can open, tested live./images/format-support (/images/format-support) Rotate & FlipTurn images a quarter at a time or flip them, one or many at once./images/rotate (/images/rotate) PNG QuantizeShrink a PNG by using fewer colors. You choose how many./images/quantize (/images/quantize) CropCut an image to a free shape or a fixed ratio like 1:1 or 16:9./images/crop (/images/crop) Favicon & Icon SetOne image becomes every favicon and app icon size a website needs, in one ZIP./images/favicon (/images/favicon) App IconsDrop one square image and get the icon sizes Android, iOS, desktop apps, or the web ask for./images/app-icons (/images/app-icons) GIF Frame ExtractorSave every frame of an animated GIF as its own image, in one ZIP./images/gif/frames (/images/gif/frames) Images to GIFPut your images in order, set how long each one shows, and get an animated GIF./images/gif (/images/gif) Animated GIF → WebP/AVIFTurn an animated GIF into a smaller animated WebP or AVIF. The timing stays the same./images/animated (/images/animated) ThumbHash PlaceholderTurn an image into a tiny placeholder code of about 25 bytes, and preview it back./images/thumbhash (/images/thumbhash) HQX Pixel-Art ScalerMake pixel art and sprites 2, 3, or 4 times bigger with sharp edges./images/hqx (/images/hqx) Palette from ImagePull the main colors out of a photo and copy them as CSS or JSON./images/palette (/images/palette) BlurHashMake a short placeholder code from an image, and preview the blur it gives./images/blurhash (/images/blurhash) LQIP PlaceholderMake a tiny blurred copy of an image to show while the real one loads./images/placeholder (/images/placeholder) SVG to PNG / WebPTurn an SVG into a PNG or WebP at the size you want. Scripts inside the SVG are removed first./images/svg (/images/svg) WatermarkAdd text or a logo to many images at once, placed where you want./images/watermark (/images/watermark)

Video
Video Tools HubConvert, compress, trim, resize, GIF, extract audio/videos (/videos) Convert VideosConvert MP4, WebM, MOV, and more, picking the container and codecs./videos/convert (/videos/convert) Compress VideosShrink MP4, WebM, and MOV files with a quality or size target./videos/compress (/videos/compress) Trim VideosCut a video down to the segment you need./videos/trim (/videos/trim) Resize VideosResize a video by width, height, or ratio./videos/resize (/videos/resize) Video to GIFTurn a video clip into a looping GIF with palette-accurate color./videos/to-gif (/videos/to-gif) Extract Audio from VideoPull a video's audio track out as MP3, WAV, AAC, or more./videos/extract-audio (/videos/extract-audio)

Audio
Audio Tools HubConvert, compress, trim, normalize, merge audio/audios (/audios) Convert AudioConvert MP3, WAV, FLAC, AAC, OGG, and more./audios/convert (/audios/convert) Compress AudioShrink MP3, WAV, and AAC files with a quality or bitrate target./audios/compress (/audios/compress) Trim AudioCut an audio file down to the segment you need./audios/trim (/audios/trim) Normalize AudioEven out loudness across tracks so they play at one volume./audios/normalize (/audios/normalize) Merge AudioJoin several audio files into one track, in the order you pick./audios/merge (/audios/merge)

PDF & files
File Tools HubPDF, ZIP, EXIF, font and SVG heavy-format tools/files (/files) PDF InspectorSee a PDF's page count, page sizes, and details, and which pages have text./files/pdf-inspect (/files/pdf-inspect) PDF Page ExtractorPick the pages you want and save them as a new PDF./files/pdf-extract (/files/pdf-extract) PDF Page DeleterPick pages to remove and download the PDF without them./files/pdf-delete (/files/pdf-delete) PDF Page RotatorTurn sideways or upside-down pages the right way up./files/pdf-rotate (/files/pdf-rotate) PDF Page ReordererDrag pages into a new order and save the PDF./files/pdf-reorder (/files/pdf-reorder) PDF SplitterCut one PDF into several: by page ranges, every few pages, or one file per page./files/pdf-split (/files/pdf-split) PDF to ImagesSave each page of a PDF as a PNG or WebP image./files/pdf-to-images (/files/pdf-to-images) ZIP Inspector & BuilderSee what is inside a ZIP, take out single files, or make a new ZIP./files/zip (/files/zip) Photo Metadata DiscloserSee what a photo gives away, like where and when it was taken, and save a clean copy./files/exif (/files/exif) Image Metadata EditorRead, edit, or remove the date, author, and location stored in an image./files/metadata (/files/metadata) Font File InspectorPreview a TTF, OTF, or WOFF font and see its details./files/font (/files/font) SVG SanitizerSee what hidden scripts or links an SVG carries and save a safe copy./files/svg (/files/svg) Gzip Compress & DecompressCompress a file to .gz or open a .gz file./files/gzip (/files/gzip) Brotli Compress & DecompressCompress a file to .br or open a .br file./files/brotli (/files/brotli) Zstandard DecompressOpen a .zst file./files/zstd (/files/zstd) 7z ExtractorSee what is inside a .7z archive and take files out./files/7z (/files/7z) WOFF2 ConverterConvert a TTF font to WOFF2 for the web, or back again./files/woff2 (/files/woff2) Tar Inspector & BuilderOpen a .tar or .tar.gz archive, take files out, or make a new one./files/tar (/files/tar) ICS Calendar Inspector & WriterSee what is inside a calendar file, or make a simple one with your own events./files/ics (/files/ics) vCard Inspector & WriterRead a contact card (.vcf), or make one with your name, phone, and address./files/vcard (/files/vcard) PDF MergerPut several PDFs in the order you want and join them into one file./files/pdf-merge (/files/pdf-merge) Images to PDFTurn photos and scans into one PDF, one image per page./files/images-pdf (/files/images-pdf) PDF Text ExtractorCopy all the text out of a PDF as plain text, Markdown, or HTML./files/pdf-text (/files/pdf-text) DOCX ReaderOpen a Word document, see what is in it, and save its text as Markdown, HTML, or plain text./files/docx (/files/docx) XLSX Reader & WriterOpen an Excel sheet and save it as CSV or JSON, or make a new sheet from CSV./files/xlsx (/files/xlsx) PPTX Reader & Slide PDFOpen a PowerPoint file to read slide text and notes, and save slides as a PDF./files/pptx (/files/pptx) HTML to PDFWrite or paste HTML and save it as a PDF./files/html-pdf (/files/html-pdf) Markdown to PDFTurn Markdown notes into a tidy PDF./files/markdown-pdf (/files/markdown-pdf) HTML workbenchTidy, shrink, or inspect HTML, and see it as plain text./files/html-workbench (/files/html-workbench)

Text
Text Tools HubWord counts and case conversion/text (/text) Word & Character CountCount words, characters, sentences, and lines as you type or paste./text/word-count (/text/word-count) Text DiffPaste two versions and see exactly what changed, line by line or letter by letter./text/diff (/text/diff) Slug GeneratorTurn titles into clean web addresses like my-first-post./text/slugify (/text/slugify) Lorem Ipsum GeneratorPlaceholder text in words, sentences, or paragraphs for mockups./text/lorem (/text/lorem) Find & ReplaceFind a word or pattern in your text and replace every match at once./text/find-replace (/text/find-replace) Number Base ConverterConvert whole numbers between binary, hex, decimal, and any base up to 36./text/number-bases (/text/number-bases) Escape / UnescapeEscape or unescape text for HTML, JavaScript strings, and CSV./text/escape (/text/escape) Emoji SearchSearch emoji by name and copy one with a click. Works offline once loaded./text/emoji (/text/emoji) Character TableBrowse ASCII and Unicode characters and copy any of them./text/character-table (/text/character-table) Case ConverterChange text to UPPER, lower, Title, Sentence case, and ten more./text/case-converter (/text/case-converter) Markdown ⇄ HTMLTurn Markdown into HTML with a live preview, or HTML back into Markdown./text/markdown (/text/markdown) Markdown TablePaste rows from a spreadsheet or CSV and get a Markdown table./text/markdown-table (/text/markdown-table) Unicode InspectorSee what every character in your text really is, with its code and bytes./text/unicode (/text/unicode) Mojibake RepairFix garbled text like Café back into Café./text/mojibake (/text/mojibake) SMS CounterSee how many characters and text messages your SMS will use./text/sms (/text/sms) Line OperationsSort lines, remove duplicates and blank lines, trim spaces, or number them./text/lines (/text/lines)

QR codes
QR Generator HubQR codes for links and text/qr (/qr) QR GeneratorMake a QR code for any link or text and save it as PNG or SVG./qr/generator (/qr/generator) QR ScannerRead a QR code from a photo or your camera. Links never open on their own./qr/scanner (/qr/scanner) WiFi QR CodeA QR code guests can scan to join your Wi-Fi without typing the password./qr/wifi (/qr/wifi) vCard QR CodeA QR code that saves your contact details straight to someone's phone./qr/vcard (/qr/vcard) QR StudioQR codes with your colors, rounded shapes, and a logo, checked to still scan./qr/studio (/qr/studio) QR BatchMake many QR codes from a list or spreadsheet and download them as one ZIP./qr/batch (/qr/batch)

Units & math
Converter Tools HubUnits, fractions, statistics, primes, ratios/converters (/converters) Unit ConverterLength, weight, temperature, speed, data, and more. Type one value and see every unit./converters/units (/converters/units) FractionsTurn decimals into fractions and back, simplified./converters/fractions (/converters/fractions) StatisticsPaste a list of numbers and get the average, median, spread, and more./converters/statistics (/converters/statistics) Prime / GCD / LCMCheck if a number is prime, split it into factors, and find the GCD or LCM./converters/primes (/converters/primes) Aspect Ratio & DPIWork out aspect ratios, keep them when resizing, and find print sizes from DPI./converters/aspect-ratio (/converters/aspect-ratio)

Time & dates
Time Tools HubAll time utilities/time (/time) TimestampsUnix ⇄ ISO dates, live clock/time/timestamp-converter (/time/timestamp-converter) TimezonesOne moment across IANA zones/time/timezone-converter (/time/timezone-converter) Durationsms → weeks with breakdown/time/duration-converter (/time/duration-converter) AvailabilityShare free and busy slots/time/availability (/time/availability) Date MathAdd days, weeks, or months to a date, or count the time between two dates./time/date-math (/time/date-math) Calendar ConverterConvert dates between the Gregorian, Hijri, Hebrew, Persian, Chinese, and other calendars./time/calendar-converter (/time/calendar-converter) ISO 8601 DurationRead and write ISO 8601 durations like P1DT2H./time/iso-duration (/time/iso-duration) ISO Week NumberFind the week number of any date, or the dates in a week./time/week-number (/time/week-number) Business Day CalculatorCount working days between two dates, with your own holidays left out./time/business-days (/time/business-days) Stopwatch and CountdownA stopwatch with laps and a countdown timer that keeps time in a background tab./time/stopwatch (/time/stopwatch) Epoch Batch ConverterConvert a whole list of Unix timestamps into readable dates at once./time/epoch-batch (/time/epoch-batch)

Color
Color Tools HubColor conversion and WCAG contrast/color (/color) Color ConverterConvert a color between HEX, RGB, HSL, and HSV, and check its contrast with another./color/converter (/color/converter) OKLCH Color PickerPick colors by lightness, intensity, and hue, and copy them in every format./color/oklch (/color/oklch) Color Palette GeneratorBuild a matching palette from one color: complementary, analogous, triadic, and more./color/palette (/color/palette) Tint & Shade GeneratorMake even steps of lighter and darker shades from one color./color/shades (/color/shades) Contrast CheckerCheck that text is readable on its background, with a fix when it is not./color/contrast (/color/contrast) Image Color PickerClick any spot in an image to get its color, or pull out a whole palette./color/picker (/color/picker) CSS Gradient BuilderBuild a gradient with a live preview and copy the CSS or save a PNG./color/gradient (/color/gradient) Color Blindness SimulatorSee how colors and images look to people with common kinds of color blindness./color/blindness (/color/blindness)

Passwords & IDs
Generator Tools HubPasswords, tokens and UUIDs/generate (/generate) PasswordsCSPRNG password generator/generate/password-generator (/generate/password-generator) Random Token GeneratorRandom API keys, secrets, and IDs, with how hard each one is to guess./generate/random-token (/generate/random-token) UUIDUUID v1-v7 generator/generate/uuid-generator (/generate/uuid-generator)

Device tests
Device Tools HubCamera, microphone, speaker, keyboard, screen tests and recording/device (/device) Webcam TestSee your camera picture, check its resolution, and switch cameras./device/webcam (/device/webcam) Microphone TestSpeak and watch the level meter move. Nothing is recorded./device/microphone (/device/microphone) Speaker TestPlay a tone in the left, right, or both speakers to check they work./device/speakers (/device/speakers) Keyboard TestPress any key and see it light up, so you know which keys work./device/keyboard (/device/keyboard) Gamepad TestPress buttons and move the sticks to check a game controller./device/gamepad (/device/gamepad) Dead Pixel TestFill the screen with solid colors to spot dead or stuck pixels./device/dead-pixel (/device/dead-pixel) Refresh RateMeasure how many times a second your screen refreshes./device/refresh-rate (/device/refresh-rate) Screen RecorderRecord your screen, a window, or a browser tab and save the video./device/screen-recorder (/device/screen-recorder) Touch TestTouch the screen with one or more fingers to check that touch works everywhere./device/touch (/device/touch) Vibration TestCheck whether your phone can vibrate from a web page./device/vibration (/device/vibration) Battery TestSee your battery level and whether it is charging./device/battery (/device/battery) Motion and OrientationSee live readings from your phone's motion and tilt sensors./device/motion (/device/motion) MIDI MonitorConnect a MIDI keyboard or controller and watch the notes come in./device/midi (/device/midi) Storage InspectorSee what this site has saved in your browser./device/storage (/device/storage) Permissions ViewerSee which permissions this site has, like camera or location./device/permissions (/device/permissions) Notification TestCheck that browser notifications reach you./device/notifications (/device/notifications) Clipboard Write TestCheck that copying to the clipboard works in this browser./device/clipboard (/device/clipboard) Codec MatrixSee which video and audio formats this browser can play and record./device/codec-matrix (/device/codec-matrix) WebRTC LoopbackCheck that video-call connections work in this browser, without a server./device/webrtc (/device/webrtc)

Sun & moon
Sky Tools HubSunrise, sunset, golden hour, moon phase/sky (/sky) Sunrise & SunsetSunrise, sunset, and twilight times for any place and date./sky/sunrise-sunset (/sky/sunrise-sunset) Golden HourWhen the golden hour and blue hour start and end, for photographers./sky/golden-hour (/sky/golden-hour) Moon PhaseTonight's moon phase, when it rises and sets, and the next full moon./sky/moon-phase (/sky/moon-phase) Sun PositionWhere the sun sits in the sky at any time and place, as a compass direction and height./sky/sun-position (/sky/sun-position)

JSON
JSON Tools HubFormat, inspect, and convert JSON/json (/json) JSON FormatterPretty-print, minify, validate/json/formatter (/json/formatter) JSON ValidatorCheck strict JSON or JSONC, then explore it as a tree./json/validator (/json/validator) JSON SortSort object keys, top level or every level./json/sort (/json/sort) JSON String EscapeEscape raw text into a JSON string body, and back./json/escape (/json/escape) JSON QueryPull values out with JSON Pointer or a JSONPath subset./json/query (/json/query) JSON DiffSemantic and text comparison of two documents, with an RFC 6902 patch export./json/diff (/json/diff) JSON ConverterConvert JSON to and from JSON5, HJSON, plist (XML or binary), YAML, TOML, CSV, XML, NDJSON, query strings, .env, MessagePack, CBOR, and BSON./json/convert (/json/convert) JSON to CodeTurn JSON into typed models in 27 languages, including TypeScript, Go, Rust, Python, Swift, and Kotlin./json/codegen (/json/codegen) JSON Schema ValidatorValidate JSON against a JSON Schema (2020-12, 2019-09, or draft-07) with every rule stated up front./json/schema (/json/schema) JSONL / NDJSONValidate line by line, infer columns, convert JSONL to CSV/TSV/Markdown/JSON./json/jsonl (/json/jsonl) Flatten JSONNested objects to dot keys and back. Collisions are caught and ambiguity is refused./json/flatten (/json/flatten) JSON Schema generatorInstance to schema: required threshold, nullability, tuples, re-validated./json/schema-generator (/json/schema-generator)

Encoding
Encoding Tools HubBase64 and URL encode/decode/encoding (/encoding) Base64Encode / decode Base64 text/encoding/base64 (/encoding/base64) URL EncoderPercent-encode / decode URLs/encoding/url-encoder (/encoding/url-encoder) Image ⇄ Base64Image files to data URLs and back. The format is read from the bytes, dimensions are decoded, and nothing is re-encoded./encoding/image-base64 (/encoding/image-base64) Base32 EncoderRFC 4648, base32hex, Crockford, and z-base-32 with separate alphabets./encoding/base32 (/encoding/base32) Base58 EncoderBitcoin-alphabet Base58 with an optional Base58Check checksum./encoding/base58 (/encoding/base58) Base62 EncoderBase62 over an explicit alphabet, with duplicate characters refused./encoding/base62 (/encoding/base62) Hex DumpOffsets, hex columns, and ASCII gutters with search and paging./encoding/hex-dump (/encoding/hex-dump) HTML EntitiesNamed and numeric entity encoding and decoding, ambiguous & preserved./encoding/html-entities (/encoding/html-entities) Punycode / IDNUnicode hostnames to xn-- labels and back, with homograph warnings./encoding/punycode (/encoding/punycode)

Regex & cron
Developer Tools HubRegex, cron, semver and glob testers/dev (/dev) Regex TesterTest a regular expression against your own text with the browser's own engine, in a disposable worker./dev/regex-tester (/dev/regex-tester) Cron Builder & ExplainerExplain a cron schedule in plain English and list its next fire times, dialect and timezone explicit./dev/cron (/dev/cron) Semver CompareSort versions, compare two, and match ranges. Strict SemVer 2.0.0, with coercion shown separately./dev/semver (/dev/semver) Glob TesterTest glob patterns against a list of paths with picomatch in a bounded worker, dialect explicit./dev/glob-tester (/dev/glob-tester)

Web & auth
Web Tools HubJWT tokens and claims/web (/web) JWT DecoderInspect JWT claims, verify signatures locally/web/jwt (/web/jwt) TOTP GeneratorRFC 6238 codes from an authenticator secret, plus code verification with a clock-drift window./web/totp (/web/totp) PKCE PairGenerate an RFC 7636 verifier/challenge pair, or check a pair against each other./web/pkce (/web/pkce) Subresource IntegrityHash a script or stylesheet into an integrity= attribute, from text or file./web/sri (/web/sri) Authorization HeaderParse an Authorization header: Basic decodes, Bearer shape-checks, Digest splits./web/auth-header (/web/auth-header) CSP EvaluatorEvaluate a Content Security Policy with csp_evaluator, or build one finding by finding./web/csp (/web/csp) SAML InspectorRead a SAML response (fields, attributes, conditions) and check its signature./web/saml (/web/saml) Certificate InspectorX.509 certificates and CSRs: subject, SANs, validity window, key facts./web/certificate (/web/certificate) JWK / JWKSInspect a JSON Web Key or JWKS: members, thumbprint, PEM form./web/jwk (/web/jwk) HTTP Header ParserPaste-in request/response headers with repeated-header preservation./web/headers (/web/headers) Cookie AnalyzerSet-Cookie breakdown: attributes, expiry dates, prefix rules, warnings./web/cookie (/web/cookie) Open Graph PreviewExtract og:/twitter: meta from pasted HTML and see the card it builds./web/og-preview (/web/og-preview) HTTP Status ReferenceSearchable, dated snapshot of the IANA status registry with RFC references./web/http-status (/web/http-status) JWE DecryptorCompact JWE decryption with local oct, PBES2, or RSA keys through jose./web/jwe (/web/jwe) SSH Key InspectorPublic key wire parse, fingerprints, options, and comments./web/ssh-key (/web/ssh-key) robots.txt TesterPaste-in rules with RFC 9309 longest-match verdicts per path./web/robots (/web/robots) cURL ConvertercURL to fetch, axios, and Python requests with a loss report./web/curl-converter (/web/curl-converter)

Hashing & encryption
Crypto Tools HubHashes and digests/crypto (/crypto) HashesSHA-2, SHA-3, Keccak, BLAKE, MD5 and CRC32 digests/crypto/hash (/crypto/hash) Password StrengthScore a password with zxcvbn, the guessing model, with matched patterns shown./crypto/password-strength (/crypto/password-strength) HMACKeyed MACs over text: SHA-1/256/384/512 through WebCrypto, keys as text/hex/base64./crypto/hmac (/crypto/hmac) bcryptHash with bcryptjs at cost 4 to 15 in a disposable worker; verify against a pasted hash./crypto/bcrypt (/crypto/bcrypt) Argon2id HasherPassword hashing with presets, bounded custom parameters, PHC output, and verify./crypto/argon2 (/crypto/argon2) AES-GCM EncryptAuthenticated encryption with raw keys or PBKDF2 passphrases and a versioned envelope./crypto/aes-gcm (/crypto/aes-gcm) Key GeneratorRSA, ECDSA, ECDH, and Ed25519 key pairs exported as JWK and PEM./crypto/key-generator (/crypto/key-generator) HKDF DeriverRFC 5869 extract-then-expand key derivation with explicit salt and info./crypto/hkdf (/crypto/hkdf) Checksum Manifestsha256sum-style multi-file verification with missing, extra, and per-line errors./crypto/hash-manifest (/crypto/hash-manifest)

Config files
Config Tools Hub.env, INI and .properties editors, chmod, CSV to SQL, docker run/config (/config) .envInspect and format .env files: duplicates, exports, quoting rules named./config/env (/config/env) INIParse INI: sections, dotted paths, boolean coercions, last-wins duplicates./config/ini (/config/ini) .propertiesJava properties: dotted keys, escapes decoded, comments counted./config/properties (/config/properties) chmodOctal ⇄ symbolic permission modes, special bits named for what they do./config/chmod (/config/chmod) CSV to SQLPaste CSV, get INSERT statements, quoted per standard SQL with NULLs by your choice./config/csv-to-sql (/config/csv-to-sql) docker run → composeTurn a docker run command into a compose service. Unmapped flags are listed, never dropped./config/docker (/config/docker) nginx.conf ExplainerPaste an nginx.conf snippet: every directive explained in its block context, unknowns counted, nothing loaded or tested./config/nginx (/config/nginx) SSH Config ExplainerPaste sshconfig or sshdconfig: Host blocks and every keyword explained, weakening settings called out, nothing connects./config/ssh (/config/ssh) YAMLFormat, validate, and convert YAML to and from JSON with a loss ledger./config/yaml (/config/yaml) TOMLFormat, validate, and convert TOML to and from JSON, with dates and big ints exact./config/toml (/config/toml) XMLFormat, validate, extract, view the tree, and convert XML. Mapping stated, transform set declared, subset documented./config/xml (/config/xml) CSV studioSniff, profile, and convert CSV: column stats, type preview, formula guard./config/csv (/config/csv) SQL to CSVRead INSERT statements back as CSV, TSV, JSON, JSONL, or Markdown./config/sql-to-csv (/config/sql-to-csv) umaskWhat a umask clears, and the file (0666) and directory (0777) modes it leaves./config/umask (/config/umask)

Network
Network Tools HubSubnet math, IPv6 notation, classification, ports/network (/network) IPv4 Subnet CalculatorNetwork, broadcast, mask, wildcard, host counts. Exact BigInt math on your CIDR./network/ipv4-subnet (/network/ipv4-subnet) IPv6 Expand & CompressExpand, compress, and canonicalize IPv6 with RFC 5952 rules applied and named./network/ipv6-format (/network/ipv6-format) IPv6 Prefix CalculatorFirst and last address, exact 2^n capacity, arpa prefix, for any prefix from /0 through /128./network/ipv6-subnet (/network/ipv6-subnet) IP Range ClassifierPrivate, reserved, or special-purpose, checked against a dated IANA registry snapshot./network/ip-classify (/network/ip-classify) IP Number FormsIPv4/IPv6 as integer, hex, and binary, exact in both directions./network/ip-numbers (/network/ip-numbers) VLSM PlannerAllocate unequal subnets from one base, every sizing decision visible as a step./network/vlsm (/network/vlsm) Subnet Split & AggregateSplit a block into equal children, or merge siblings back. Preconditions are refused honestly./network/subnet-split (/network/subnet-split) MAC & EUI-64Every MAC notation, the U/L and group bits named, the EUI-64 and its fe80:: derivation./network/mac-eui64 (/network/mac-eui64) Port ReferenceA dated, curated IANA port snapshot: search numbers, names, and protocols./network/ports (/network/ports) Bandwidth CalculatorTransfer time at a line rate: exact fractions, both unit bases, no fake efficiency./network/bandwidth (/network/bandwidth) CIDR Overlap CheckPairwise overlaps and uncovered gaps over pasted CIDR blocks./network/cidr-check (/network/cidr-check) MTU & MSS CalculatorVersioned overhead table for VLAN, PPPoE, GRE, VXLAN, WireGuard, IPsec./network/mtu (/network/mtu) ULA GeneratorRFC 4193 unique local addresses plus a /48 planner./network/ula (/network/ula) DNS Explainerdig transcripts and zone records explained line by line; no resolver./network/dns-explain (/network/dns-explain) Live DNS LookupResolve a name over DNS-over-HTTPS JSON (Cloudflare or Google): records, TTLs, status, flags./network/dns (/network/dns) What Is My IPYour public address as the echo endpoints see it: IPv4 and dual-stack, classified./network/my-ip (/network/my-ip) RDAP LookupRegistry data for domains, IPs, and AS numbers over RDAP: events, status, nameservers./network/rdap (/network/rdap) HTTP Timing ProbeRepeated timed GETs against an https URL: TTFB, totals, and Resource Timing phase splits./network/http-timing (/network/http-timing) WebSocket TesterConnect a WebSocket in your browser: subprotocols, frames, close codes, timeouts./network/ws-tester (/network/ws-tester)

Browser
Browser Tools HubLive browser report, UA parsing, capability probes/browser (/browser) Browser ReportEvery identity field your browser volunteers, read live in this tab, caveats included./browser/ua-report (/browser/ua-report) UA ParserPaste any user-agent string, see the browser, engine, OS, and device it claims./browser/ua-parser (/browser/ua-parser) Capability DashboardWhich APIs this browser has: presence measured, permissions only queried, never asked./browser/capabilities (/browser/capabilities) Feature SupportA dated web-platform snapshot checked live, so you see where this browser agrees, leads, or lags./browser/feature-support (/browser/feature-support) Screen & ViewportScreen, DPR, layout and visual viewports, orientation, preferences. Live values, fingerprinting labeled./browser/screen (/browser/screen) Deep ProbesFonts, codecs, WebGL/WebGPU, storage, permissions: the five probes that need real work./browser/probes (/browser/probes)

AI
AI Tools HubToken counting, context fit, costs, fine-tune files, exports/ai (/ai) Tokenizer PlaygroundCount and inspect OpenAI tokens (o200k, cl100k, p50k, r50k) in a worker./ai/tokenizer (/ai/tokenizer) Context FitDoes your prompt fit? Exact OpenAI counts; labeled estimates for any other model./ai/context-fit (/ai/context-fit) API Cost EstimatorWhat a prompt costs to run: dated price data, exact arithmetic, tiers applied./ai/cost-estimator (/ai/cost-estimator) Fine-tune JSONL FormatterValidate and format training files: target presets, per-line errors, loss ledger./ai/jsonl-formatter (/ai/jsonl-formatter) Chat Export ViewerRead a ChatGPT export or JSONL log. Virtualized, local, nothing sent anywhere./ai/chat-export (/ai/chat-export) Chat Template RendererRender a transcript to ChatML, Llama, Mistral, or Gemma format, with token counts./ai/chat-template (/ai/chat-template) Model ComparisonThe dated model registry as a table: context, output ceiling, rates, long tiers, tokenizer status./ai/model-comparison (/ai/model-comparison) Vision Token CostImage tokens by documented tile/area rules, costed exactly. Versioned formulas, custom rates, no vendor calls./ai/vision-cost (/ai/vision-cost) Prompt DiffBefore/after prompts with exact token deltas, a line diff, and the cost change per model./ai/prompt-diff (/ai/prompt-diff)

Fake data
Data Tools HubFake names, addresses, phones, people, companies, bulk test data/data (/data) Fake Name GeneratorFake names from a locale's own pools (first, last, and full), seeded so every list reproduces./data/name (/data/name) Fake Address GeneratorFake street, city, region, postcode, and country rows in the locale's pattern. Shapes for tests, never locations./data/address (/data/address) Fake Phone Number GeneratorPhone numbers that match a locale's pattern, for form tests, with no live/dead claim anywhere./data/phone (/data/phone) Fake Person GeneratorWhole fake people (name, username, example-domain email, phone, birthday, job, address), one seeded row./data/person (/data/person) Fake Company GeneratorInvented company names with catch phrase and buzz phrase. Fixture businesses matching no registry./data/company (/data/company) Bulk Test-Data BuilderThousands of fake rows for tests: pick columns, lock a seed, export JSON, JSONL, or CSV./data/test-data (/data/test-data) Relational datasetsUsers → orders → line items: seeded FKs, reproducible CSV/JSONL/SQL exports./data/relational (/data/relational)

Media

Legal
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