The collection / 37 tools
Word counts, file conversions, JSON formatting, and a drum machine.
Format or minify JSON and check for syntax errors.
Make QR codes for links, text, contacts, and Wi-Fi details.
Convert images between PNG, JPEG, WebP, and other formats.
Generate passwords with your chosen length and character sets.
Count words and characters, then estimate reading and speaking time.
Convert length, weight, volume, and temperature measurements.
Find shared working hours across time zones and export a meeting.
Scale an ingredient list to new servings, including fractions.
Compare a local file with its published SHA-256 checksum.
Convert audio files between MP3, WAV, and other formats.
Build drum patterns on a 16-step sequencer.
Set a countdown with a fullscreen display and sound alerts.
From the guides
Hi 👩💻!An emoji can contain several Unicode characters. Here, the woman, joiner, and laptop form one visible symbol. Text Counter treats it as one character in browsers with Intl.Segmenter; JavaScript’s string length counts the same text differently.
For a form with a length limit, check its own counter after pasting.
How character counts worktea & biscuitsIn a URL, an ampersand usually separates query parameters. If it’s part of the search phrase, encode the value in Component mode: & becomes %26. Keep the address around that value intact.
Encoding an already encoded space turns %20 into %2520. Encode each value once.
URL encoding, with examples00127 → 127The CSV converter infers numbers automatically, even inside quoted fields. That works for quantities, but removes leading zeros from IDs. Compare the output with the source; quoting 127 afterward won’t bring the zeros back.
For a dataset with identifier columns, use an importer that preserves those columns as strings.
CSV types and quoted fields