169
tools
Developer
Formatters, encoders, generators and testers.
Ad mockup generator Drop the creative in and see the whole unit. →Ad preview tool Headline, body and image, against the tightest limits. →Add prefix to lines A string on the front of every line. →Apache config formatter Directive blocks indented by depth. →App icon sizes One master at 1024, and what each store does to it. →App store QR code generator One code, either store. →Apple touch icon size 180 × 180, and never transparent. →ASCII table All 128 codes in decimal, hex, octal and binary. →ASCII to binary Text into eight-bit binary, one group per character. →ASCII to hex Text into hex character codes. →Banner ad sizes The IAB standard set, and which ones sell. →Barcode generator EAN, UPC, Code 128 and more, with the check digit. →Bars to seconds calculator How long a section runs at a tempo. →Base64 decoder Handles missing padding and the URL-safe alphabet. →Base64 encoder UTF-8 safe, with the URL-safe alphabet. →Binary to ASCII Eight-bit groups back into readable text. →Binary to decimal Binary to decimal, with hex and octal beside it. →Binary to hex Binary to hex, grouping the bits into nibbles. →Binary to IPv4 Thirty-two bits, read back as an address. →Bit shift calculator Left and right shifts, and what they do to the value. →Bitwise calculator AND, OR, XOR and NOT on two values, in any base. →Bulk find and replace Many replacements in one pass. →Calendar event QR code generator Scan to add an event to the calendar. →camelCase converter Spaces out, every word after the first capitalised. →Checksum calculator Hash a file and compare it to the published sum. →CIDR calculator What a prefix actually covers. →CIDR to netmask /24 is 255.255.255.0. →Click speed test How many clicks per second, over ten seconds. →Code 128 barcode generator Any text, any length, densely packed. →List difference tool In one list and not the other. →Compare two lists What is in one and not the other. →Test card number generator Luhn-valid numbers for testing a checkout form. →Card number checker Luhn checksum, brand and length. →Cron expression explainer What that schedule actually does, in English. →Cron expression parser What it says, and when it next fires. →CSS formatter One declaration per line, or none at all. →CSS minifier Comments, whitespace and the last semicolon. →CSV to JSON Quoted commas and line breaks handled properly. →CSV to SQL INSERT A spreadsheet into statements you can run. →curl to axios The same command, as an axios config. →curl to fetch A pasted curl command as JavaScript. →Day of year to date Day 200 of 2026 is which date? →Decimal to binary Decimal to binary, grouped so it is actually readable. →Decimal to hex Decimal to hexadecimal, plus binary and octal. →Decimal to octal Base 10 to base 8, with the three-bit groups shown. →Diff checker Line by line, with the unchanged parts folded away. →Docker Compose formatter Compose is YAML, and its indentation is meaning. →EAN-13 barcode generator The world retail barcode, check digit included. →Email QR code generator Opens a draft with subject and body filled in. →.env formatter KEY=value, quoted only where it must be. →Epoch converter Epoch time in and out, with the milliseconds question settled. →Excel column letter to number AA is 27, not 26, bijective base-26. →Extract domain from URL Hostnames only, www stripped, de-duplicated. →Extract emails from text Every address, de-duplicated, one per line. →Extract numbers from text Every number, decimals and negatives included. →Extract phone numbers from text Numbers out, with an honest caveat. →Extract URLs from text Links out, trailing punctuation stripped. →Facebook ad preview Primary text, headline and where they cut. →Facebook ad size 1080 × 1080 feed, 1080 × 1920 stories. →Facebook carousel ad size 1080 × 1080 per card, all the same ratio. →Favicon sizes The four files that actually cover everything. →File hash checker Hash a batch of files and compare the digests. →Fluid typography calculator A CSS clamp() that scales with the viewport. →FPS timecode calculator Frames to timecode and back, at any frame rate. →Google Ads preview Headlines and descriptions against their limits. →Google display ad sizes The five that get almost all the inventory. →GraphQL formatter Indented by depth, commas dropped. →Hash generator MD5, SHA-1, SHA-256, SHA-512 and CRC-32 of any text. →Hex to ASCII Hex character codes back into readable text. →Hex to binary Hex to binary, four bits per digit, exactly. →Hex to decimal Hexadecimal to decimal, with binary and octal alongside. →HTML decoder Entities back to the characters they stand for. →HTML encoder The five that matter, or everything above ASCII. →HTML formatter Indent without touching pre or script. →HTML minifier Whitespace and comments out, pre untouched. →HTML table generator CSV in, a real table out. →HTTP status codes Every code, and what it actually tells you. →Image to Base64 A data URI, ready to paste into CSS or HTML. →INI formatter Sections, keys and comments, tidied. →IP CIDR calculator An address and a prefix, fully expanded. →IP range to CIDR A start and end address, as the fewest blocks. →IPv4 calculator One address, every representation. →IPv6 calculator Expand, compress, and what the prefix means. →ISBN barcode generator ISBN-13 as the EAN-13 a shop can scan. →JSON flattener Nested objects to dotted paths, and back. →JSON flattener Nested objects into dotted paths. →JSON formatter Format, minify, validate and sort keys. →JSON Lines to array NDJSON into one array, with the broken row named. →JSON minifier Every byte of whitespace out. →JSONPath tester An expression, and every value it matches. →JSON empty value remover Nulls, empty strings and empty containers out. →JSON key sorter Alphabetical at every level, so a diff is readable. →JSON to CSV Every key becomes a column, nothing dropped. →JSON to YAML Readable config, with the right things quoted. →JSON unflattener Dotted paths back into nested objects. →JSON validator Valid or not, and exactly where it fails. →Julian date converter The astronomical Julian Day, not the ordinal date. →JWT decoder Header, payload and expiry, signature not verified. →kebab-case converter Lowercase, joined with hyphens. →Network latency calculator The floor physics puts under your ping. →Leaderboard ad size 728 × 90, and the mobile one that replaced it. →Link preview generator Build the card, then copy the tags you need. →List to comma separated A column of lines into one delimited line. →Location QR code generator Coordinates that open in any maps app. →MAC address formatter Colons, hyphens, Cisco dots or none. →Markdown table formatter Pipes lined up, columns padded. →Markdown table generator Paste a spreadsheet column, get a table. →Markdown to HTML The HTML, and a preview of it. →MD5 generator For checking old published checksums, not for security. →Online metronome Accented downbeat, 30 to 260 BPM. →Nano ID generator Short, URL-safe, and still collision-resistant. →Netmask to CIDR 255.255.255.0 is /24. →nginx config formatter Blocks indented by depth. →Number base converter Any base from 2 to 36, in either direction. →Number lines Numbered from any start, any separator. →Octal to decimal Base 8 to base 10, the one file permissions use. →Open Graph preview The card Facebook, LinkedIn and Slack will build. →Open Graph image size 1200 × 630, the one image every platform reuses. →PascalCase converter Every word capitalised, including the first. →Passphrase generator Words you can actually remember, still hard to guess. →Password entropy calculator What a password policy is actually worth, in bits. →Password generator Strong passwords, drawn in your browser and never sent. →Password strength checker An upper bound on how strong a password is, never sent. →Phone QR code generator Scan to dial, no typing. →QR code generator Links, Wi-Fi, contacts, no redirect, no expiry. →Random PIN generator Digits only, leading zeros kept. →Random token generator Hex, base32, base58, base62 or a UUID. →Reaction time test Click when it turns green. Median of your attempts. →Regex escaper Literal text, safe to drop into a pattern. →Regex tester Matches highlighted as you type, and the pattern read back to you. →SERP preview tool How your title and description will actually be cut. →SHA256 generator The 64-character digest, computed as you type. →Shuffle lines Random order, every arrangement equally likely. →Skyscraper ad size 160 × 600, the tall one down the side. →Slug generator Accents folded, everything else hyphenated. →SMS QR code generator Opens a text with the number and message filled in. →snake_case converter Lowercase, joined with underscores. →Snapchat ad size 1080 × 1920, with three seconds to land. →Social share preview One card, checked against every platform limit. →SQL formatter Keyword breaks, with string literals protected. →SQL IN list formatter A pasted list into a WHERE clause. →SQL minifier One line, comments gone, strings untouched. →SQL to CSV INSERT statements back into a spreadsheet. →Strip HTML tags Tags out, and the script contents with them. →Subnet calculator Network, broadcast, range and host count. →Text compare Two versions side by side, differences marked. →Text to CSV converter Lines and columns into a comma-separated row. →Text to JSON array Lines into a properly escaped array. →TOML formatter Tables flush left, keys indented under them. →Tone generator 20 Hz to 18 kHz, four waveforms. →TOTP secret generator A base32 shared secret and the otpauth URI to go with it. →X / Twitter card preview Summary and large image, before you post. →Two's complement calculator Signed binary at any bit width, with the wrap-around shown. →Typing speed test Words per minute, counted the standard way. →ULID generator Sortable identifiers, timestamp first. →Unicode converter Every character, and what it actually is. →Unicode escape converter Non-ASCII in and out of escapes. →Unix timestamp converter Seconds since 1970, both directions, with millisecond detection. →UPC-A barcode generator The North American retail barcode. →URL encoder Component or full URL, they escape differently. →UUID generator Ten at a time, from the browser’s crypto source. →UUID validator Valid or not, and which version. →vCard QR code generator A contact card that scans straight into the phone. →WhatsApp QR code generator Opens a chat with your number and a message ready. →White noise generator White, pink and brown, generated, not streamed. →Wi-Fi QR code generator Guests join without typing the password. →XML formatter Indent, minify and check it is well-formed. →YAML formatter Reindented, and told where it broke. →YAML to JSON The config subset, parsed honestly. →
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