Developer Tools

Lay out a query one clause per line, or flatten it to one, without touching what is inside a string.

Safe minification with the real gzip saving measured rather than estimated.

Find the error by line and column, catch duplicate keys a parser hides, and check a document against a JSON Schema.

MD5, SHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, plus HMAC and checksum comparison.

Flatten JSON or NDJSON into a spreadsheet-ready CSV, with nested objects becoming dotted columns.

Test a pattern against real text with every match lit up — run in a worker, so a runaway expression cannot freeze the page.

Read every claim in a token, see when it expires, and actually verify its signature against a secret or public key.

Generate v4, v7 and v5 UUIDs in bulk from the browser's cryptographic random source — and read back the ones you already have.

Check HTML against forty conformance and accessibility rules — every finding with its line, column and the markup that caused it.

Everything for getting a picture into the shape, size and format something else will accept — compression, resizing, cropping, conversion between formats and background removal.

Everything for the PDF itself — joining files and taking pages out, making one smaller, stamping, redacting and locking it, and converting it to and from Word, Excel and images.

Tools for text and the formats it gets trapped inside — counting and analysing writing, converting between data formats, and pulling readable text back out of pictures.

The technical side of getting a page indexed and shared properly: the tags that decide how it appears in results, the structured data behind rich results, and the files crawlers read before anything else.

Tools for the part of posting that is fiddly rather than creative — hitting each platform's dimensions, staying inside its character limits, and getting a thumbnail or a still that actually works.

Tools that make something from nothing much: a QR code, a password, a favicon set, a colour scheme, a font pairing, or speech from a block of text.

Everyday arithmetic that is easy to get slightly wrong: percentage change and reverse percentages, an exact age, a loan repayment, a unit conversion, a meeting time across three countries.

Video and audio handled in the browser itself, with ffmpeg compiled to WebAssembly — so a large file is never uploaded, and there is no queue behind other people's jobs.