Toolkit

Turn <, >, &, " and ' into HTML entities so text shows as code, or turn them back.

Format messy or minified JSON, check it's valid, or minify it again.

Convert JSON to YAML in block, flow or quoted style, or YAML back to JSON.

Format SQL for SQLite, Postgres, MySQL and standard SQL.

Browse a large YAML file as a collapsible tree, from pasted text or a URL.

Encode and decode text with Caesar, Atbash, Vigenère or Morse code.

Pull every link out of copied web content or plain text, one per line.

Preview a hex colour, see its RGB and HSL values and contrast, and keep a palette.

Sort a list A–Z or Z–A, reverse it, and remove duplicates.

Placeholder text by the paragraph, ready to paste into a design.

Paste formatted text from a web page or document and get its HTML.

Make random, URL-safe slugs for links, filenames and IDs.

Reverse text, reverse the order of words, or sort the characters A–Z.

Highlight weasel words, passive voice and repeated words in your writing.

Turn a PNG, WebP or other image into a JPEG at the size and quality you choose.

Trace a JPEG or PNG into a scalable SVG, with a choice of detail levels.

See the hidden metadata in a photo, including where it was taken, and save a copy without it.

See one image at ten combinations of size and JPEG quality, with file sizes, and download the best.

Make a QR code with a small thechels.uk label up its edge, architectural drawing style, checked to scan.

Read a QR code from a photo, a screenshot or your camera, and see what's in it before you open it.

Drag a slider to see the earliest age your pension, SIPP and ISA pots last to 100.

Find the ISA "apex" that bridges you from early retirement to your pension, or the earliest age you could stop.

Fill in a simple invoice with your logo, line items and tax, then print it or save it as a PDF.

How long a lump sum, redundancy payment or settlement lasts when you draw it down monthly.

Will your savings last from early retirement to 100, alongside a final salary and State Pension?

Statutory redundancy, notice and holiday pay for 2026/27, with tax, NI and the likely HMRC refund.

Assign and rotate ensemble programming roles, with prompts for what each role does.

Turn a GitHub issue or pull request and all its comments into one Markdown document.

Plan or record four weeks of activity hour by hour, from sleep to high effort, and print it.

Forecast how many sprints a backlog will take, from your team's past throughput.

A focus timer with a goal for each session and a log of what you got done.

Random thought-provoking questions to sharpen backlog refinement sessions.

Chart a series of numbers with its rolling average and overall average.

Current weather for any UK postcode, using your own OpenWeatherMap key.

Search your own YAML list of films to check whether you've seen something before.

Turn the podcasts in an OPML export into a grid of their cover art, and save it as an image.

The latest episode date for every podcast in an OPML file, to spot ones that have stopped.

The latest post date for every blog in an OPML blogroll, to spot stale or broken feeds.