Forty-two tools. All on your device.

Spreadsheet rows to JSON objects and back.

Options: Direction · Delimiter · First row is a header · Detect numbers and booleans

Pretty-print, minify and validate JSON.

Options: Mode · Indent · Sort keys · Escape non-ASCII

Pull values out of JSON with JSONPath and jq-style pipes.

Options: Query · Always return an array · Indent

Binary, octal, decimal, hex and any base from 2 to 36.

Options: Input base · Output base · Bit width · Uppercase digits · Group bits in fours

Turn a one-line query into something you can read.

Options: Indent · Uppercase keywords · Commas at the start of the line

Convert XML to JSON and back, attributes included.

Options: Direction · Indent

Convert YAML to JSON and back, both directions.

Options: Direction · Indent · Sort keys

Encode and decode Base64, including the URL-safe alphabet.

Options: Mode · Alphabet · Add padding · Wrap at 76 columns

String escaping for JSON, Swift, C, shell, SQL and regex.

Options: Mode · For · Wrap in quotes

Escape text for HTML, and turn entities back into characters.

Options: Mode · Escape

Percent-encode and decode text for URLs and form bodies.

Options: Mode · Style

Subject, issuer, validity, SANs and fingerprints from a PEM or DER certificate.

Options: Show extensions

MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of text or bytes.

Options: Input is · Output · Show every algorithm

Keyed message authentication codes over any of the supported hashes.

Options: Key · Key is · Output · Compare with

Read a token's header and claims, and check HMAC signatures.

Options: HMAC secret · Secret is · Show raw segments

PBKDF2 iterations for a target time, and the bcrypt cost table.

Options: Target time · Pseudorandom function · Derived key length · Salt · Iterations to derive with

Key type, size, curve and fingerprint — without ever sending the key anywhere.

See Markdown rendered natively, with a structure summary.

Options: Show the heading outline

Match, capture and replace with live results and named groups.

Options: Pattern · Mode · Replacement · Ignore case · ^ and $ match each line · . matches newlines

URL-safe slugs, with accents folded and punctuation removed.

Options: Separator · Maximum length · Lowercase · Slugify each line separately

camelCase, snake_case, kebab-case and nine more, all at once.

Options: Convert to · Convert each line separately

Line-by-line differences between two blocks of text.

Options: Separator line · Ignore leading and trailing spaces · Ignore case · Hide unchanged lines

Characters, words, lines, reading time and the most frequent words.

Options: Frequent words to list · Ignore common words

Every scalar's name, code point, category and encoded bytes.

Options: Scalars to list · Show UTF-8 bytes

Read a cron line in English and see when it next fires.

Options: Runs to predict · Time zone

One moment shown in every zone you care about, with offsets and DST.

Options: Input zone · Show in

Epoch seconds, milliseconds, microseconds and nanoseconds ↔ readable dates.

Options: Epoch unit · Time zone

Render an HTML fragment offline, with scripts and network access off.

Options: Wrap a fragment in a document

Turn key = value lines into a query string, and back again.

Options: Direction · Encode spaces as + · Sort by key

Scheme, host, port, path, query and fragment, decoded.

Options: Decode query values

HEX, RGB, HSL, HSB and CMYK, with WCAG contrast ratios.

Options: Primary output · Uppercase hex

Network, broadcast, host range and subnet splits for IPv4 and IPv6.

Options: Split into /n subnets · Subnets to list

Symbolic and octal file permissions, both directions.

Options: Show the chmod command

The git command you half-remember, with an example.

Options: Results to show

What each status code means and when to send it.

Options: Results to show

File extension ↔ MIME type, offline.

Options: Results to show

Parse, order and range-check semantic versions.

Options: Mode · Range · Sort newest first

ULIDs that sort by time, and NanoIDs with your own alphabet.

Options: Kind · How many · NanoID length · NanoID alphabet

Placeholder words, sentences and paragraphs.

Options: Generate · How many · Start with “Lorem ipsum dolor sit amet” · Seed

Generate a QR code, or scan one with the camera.

Options: Error correction

Passwords, hex, names, emails, IPs and dates — reproducible when seeded.

Options: Type · How many · Length · Include symbols in passwords · Seed

Random version 4 and time-ordered version 7 UUIDs, in bulk.

Options: Version · How many · Uppercase · Hyphens