Small tools that do one thing each.

Length, weight, temperature, volume, area and speed, converted as you type.

Every percentage question in one place, including tips, discounts and tax.

Divide a bill between people, with tip, tax and uneven shares handled.

Days between two dates, adding or subtracting time, and exact ages.

Numbers written out in words for cheques, plus Roman numerals and ordinals.

Pick a name, roll dice, flip a coin, or shuffle a list — fairly.

Monthly payment, total interest, and the full schedule for any loan.

Resize, crop and compress a photo, or change its format — without uploading it.

Unix timestamp in, every representation out. Paste anything date-shaped.

One moment shown in several places at once, for scheduling across zones.

Reads a cron expression back in English and lists the next ten firings.

Seconds to something human, and human back to seconds. Understands ISO 8601.

Encode and decode text or files, standard or URL-safe, with the padding made visible.

Base16, base32, base58 and base64 in one place, converting between any pair.

Percent-encode and decode, and take a URL apart into its named pieces.

HTML entity encode and decode, with a named-vs-numeric switch.

Generate a QR code with real control over version, error correction and quiet zone.

Click bits, read the number. Signed, unsigned, hex, octal and octet view at once.

Float bits laid out as sign, exponent and mantissa. Drag any of them.

Drop a file, read the offsets, and see the magic number identified.

Byte sizes converted across decimal and binary units, both directions.

SHA-1 through SHA-512 over text or a dropped file, computed in the tab.

CRC-8, CRC-16 and CRC-32 with the common polynomial variants spelled out.

Generate v4 and v7 in bulk, and decode the timestamp buried inside a v7.

Decode header and payload locally, and say loudly when the token has expired.

How much guessing your passphrase actually costs, without the wordlist shaming.

Generate passwords and passphrases from the browser's own CSPRNG.

Format, minify, sort keys, and point at the exact character that broke it.

Live match highlighting with every capture group broken out underneath.

Line diff of two blocks of text, with the moved and changed lines marked.

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

Unicode-aware slugs that survive accents, Japanese and combining marks.

Characters, words, lines and bytes, with graphemes counted properly.

Hex, RGB, HSL and OKLCH side by side, with out-of-gamut values flagged.

Two colors, the WCAG numbers, and the smallest change that would pass.

Subnet in, usable range out, with the mask drawn one bit at a time.

Toggle the permission grid, get the octal. Or paste the octal, see the grid.