Loading page
Builds a regular expression while explaining every token in a side panel and highlighting matches as you type. Ends a lot of guessing.
Opens in a new tab. We do not control this site and it may have changed since we catalogued it.
Regex101 sits in Unreasonably Useful under Learn, and we have it filed as coffee break — five to fifteen minutes of proper attention. It reads as useful and brainy.
Sites that quietly do a job you would otherwise pay for or install software for. Included because being this good for free is genuinely strange.
Paint over whatever is ruining a photo and it fills the gap convincingly. Free at standard resolution with no account.
Translates a cron expression into plain English as you type it, then tells you when it will next fire. Ends a very specific argument.
GCHQ's cyber swiss army knife: chain base64, XOR, hashes and regex into a recipe and watch the data transform at every step.
Paste two blocks of text and get a colour-coded diff back immediately. Also handles PDFs, images and spreadsheets.
Full flowchart, floorplan and network-diagram editor that saves to your own drive and has never once asked anyone for money.
Hand-drawn-looking diagrams that somehow stay legible, with live collaboration and no account. The whiteboard for people who hate whiteboards.
Paste a terrifying shell command and it pulls the whole thing apart, annotating every flag from the relevant man page.
Merge, split, compress, rotate, sign and convert PDFs from a single page. Covers nearly everything Acrobat charges a subscription for.