62 tools

Developer

Formatters, encoders, generators and testers, plus subnets, link speeds and uptime.

The largest shelf on the site, and the one that most rewards knowing its shape before you start looking. Everything here runs inside the tab: nothing you paste into a formatter, a decoder or a hash function is sent anywhere. That is the property that matters when the string in your clipboard is a production token you should not have copied in the first place.

Password generator Passwords, passphrases, PINs and tokens, drawn in your browser and never sent. →JSON formatter Format, minify, validate, sort keys, flatten and clean. →QR code generator Links, Wi-Fi, WhatsApp, contacts and events. No redirect, no expiry. →JSON validator Valid or not, and exactly where it fails. →Diff checker Two texts or two lists, with the unchanged parts folded away. →Barcode generator EAN, UPC, ISBN, Code 128 and more, with the check digit. →Reaction time test Click when it turns green. Median of your attempts. →Subnet calculator Network, broadcast, range, mask and scope for any prefix. →Text compare Two drafts of the same writing, compared word by word. →ASCII table All 128 codes in decimal, hex, octal and binary. →Base64 decoder Handles missing padding and the URL-safe alphabet. →Online metronome Accented downbeat, 30 to 260 BPM. →Hex to decimal Hexadecimal to decimal, with binary and octal alongside. →Click speed test How many clicks per second, over ten seconds. →Typing speed test Words per minute, counted the standard way. →Binary to decimal Binary to decimal, with hex and octal beside it. →HTTP status codes Every code, and what it actually tells you. →Regex tester Matches highlighted as you type, the pattern read back to you, and a literal escaped on demand. →Base64 encoder UTF-8 safe, with the URL-safe alphabet. →UUID generator UUID v4, ULID, Nano ID or MAC, up to fifty a draw, plus a validator. →CSV to JSON Quoted commas and line breaks handled properly. →Tone and noise generator 20 Hz to 18 kHz in four waveforms, or white, pink and brown noise. →XML formatter Indent, minify and check it is well-formed. →Markdown table generator Paste a spreadsheet column, get a table. →Hash generator SHA-256, SHA-384, SHA-512, SHA-1, MD5 and CRC-32 of any text. →URL encoder Component or full URL, they escape differently. →JWT decoder Header, payload and expiry, signature not verified. →HTML formatter Indent without touching pre or script. →Network latency calculator The floor physics puts under your ping. →Number lines Numbered from any start, any separator. →Password strength checker An upper bound on how strong a password — or a policy — is. →Image to Base64 A data URI, ready to paste into CSS or HTML. →Favicon and app icon sizes Every icon a site or an app has to ship. →Cron expression generator and explainer Build a schedule from a preset, or read one back in English. →Download time calculator How long the transfer takes, and what speed it needs. →Banner ad sizes The IAB display set, the paid social frames, and which ones sell. →Unicode converter Every character, and the four counts that never agree. →Slug generator Accents folded, everything else hyphenated. →Test card number generator and checker Luhn-valid numbers for a checkout form, and a check for one you already have. →Checksum calculator Hash files locally and compare one against the published sum. →SERP preview tool How your title and description will actually be cut. →Fluid typography calculator A CSS clamp() that scales with the viewport. →Markdown to HTML The HTML, and a preview of it. →Extract emails from text Every address, de-duplicated, one per line. →TOTP secret generator A base32 shared secret and the otpauth URI to go with it. →Excel column letter to number AA is 27, not 26, bijective base-26. →MAC address formatter Colons, hyphens, Cisco dots, bare hex, or any separator you type. →HTML entity decoder and encoder Entities back to characters, and characters back to entities. →Unicode escape converter Non-ASCII into JavaScript, HTML, CSS or URL notation, and back. →Uptime percentage calculator What "three nines" actually allows. →curl to fetch or axios A pasted curl command as JavaScript, either way round. →Wifi signal strength (dBm) What −67 dBm actually means. →Bitwise calculator AND, OR, XOR, NOT and shifts, on values in any base. →Code formatter Ten syntaxes, one box: format, minify, or convert. →Data extractor URLs, domains, emails, phone numbers and figures out of any text — and lines into a row or an array. →Data format converter JSON, CSV, YAML and SQL INSERTs, in every direction. →Decimal to binary Decimal to binary, grouped so it is actually readable. →Decimal to hex Decimal to hexadecimal, plus binary and octal. →Epoch converter Any epoch number to a date and back — Unix, FILETIME, ticks, Excel serials. →Number base converter Any base from 2 to 36, in either direction. →Table generator CSV in, an HTML or Markdown table out. →Two’s complement calculator Signed binary at 4, 8, 16 or 32 bits, with the range it fits in. →

Five shelves inside one

Format and inspect: the JSON, XML, HTML, CSV, Markdown and code formatters, the JSON validator, the diff and text-compare pair, and the regex tester. Encode and decode: Base64 both ways, URLs, HTML entities, Unicode escapes, JWTs, and the number bases — hex, binary and decimal in every direction. Generate: UUIDs, passwords, hashes, checksums, TOTP secrets, QR codes, barcodes, cron expressions and test card numbers.

Test the machine: typing speed, click speed, reaction time, the tone generator and the metronome, which read your input devices and report back without keeping anything. And the network arithmetic — subnet, latency, download time, uptime percentage and Wi-Fi signal in dBm — which had its own category until it turned out to be the same audience arriving from a different search. SEO output files are under SEO & web; the CSS generators are under Colour, next to the values you feed them.

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