Newest first. Also as an RSS feed.
: Sorting and pathfinding now have Play, Pause and Step, with a sentence for every move. A new HTTP header lookup explains any header, or a whole pasted block. Common Base64 jobs, like a Basic auth header, have their own pages.
: Each algorithm (A*, Dijkstra, quicksort, merge sort and more) has its own page with the visualizer set to it. New AI tools show the sine waves transformers add to positions, and what int8 and int4 do to model weights.
: Type an edge list like "A B 4" and get shortest paths, breadth-first and depth-first order, a topological sort, a minimum spanning tree or components, drawn with the result highlighted.
: Watch quicksort, merge sort, heapsort, shellsort, insertion, selection and bubble sort sort your numbers, see how many comparisons each makes, and race two side by side.
: Draw walls or make a maze, then watch A*, Dijkstra, breadth-first, greedy and depth-first search find the way. Race two side by side, and share a maze as a link.
: Press ? for the keyboard shortcuts. The paste box can copy a result without opening the tool, and several tools now open with a worked example.
: JSON Diff now shows the whole document with removed lines in red and added lines in green, and folds long unchanged parts. Password fields have the eye inside the field, and dropdowns are tidier.
: Hash a password with bcrypt at any cost from 4 to 14, or check a password against a bcrypt hash. The password stays hidden until you press Show.
: Convert gallons, cups, acres, hectares, km/h, mph, knots, minutes and more. New pages for common pairs like liters to gallons and mph to km/h.
: Wi-Fi passwords, generated passwords, HMAC keys and JWT secrets now show as dots, with an eye button to reveal them. Copy and download still use the real value.
: Pick one color and get complementary, analogous, triadic and other schemes, with swatches to copy. Common npm range forms like ^ and ~ now have their own pages.
: Type small Q, K and V matrices and see each step of transformer attention: scaled scores, softmax weights, an optional causal mask, and the output.
: The QR code generator can now build a Wi-Fi login from the network name and password. Print puts the code and the password on one page for guests. Paste anything also recognises XML, HTML and TOML.
: Paste JSON and get Go structs with json tags, Go initialisms like ID and URL, and omitempty for keys that are not always there.
: Turn a link or any text into a QR code and download it as SVG or PNG. Preview Markdown as you type and copy safe HTML, with tables and task lists.
: Check YAML for indentation errors and duplicate keys, and tidy it without losing comments. Beautify or safely minify HTML, with pre, script and style left untouched.
: Convert JSON and XML both ways, with attributes and repeated elements handled. Convert TOML and JSON both ways, keeping big integers and dates.
: Format, minify and check XML, with the line and column of any error. Shift text by 13 or any amount, or list all 25 shifts to crack a Caesar cipher.
: Compare two JSON documents by path, ignoring key order and formatting. Translate text to Morse code and back, and play it as sound.
: Compare vectors and embeddings by cosine similarity. The base converter can show 8 to 64-bit two's complement. Values like 0.1, MAX_SAFE_INTEGER and NaN have their own float pages.
: Turn scores into probabilities and see the loss and perplexity for the right answer. Common chmod modes like 755 and 600 now have their own pages, and paste anything recognises permissions and version ranges.
: Turn 755 into rwxr-xr-x with a grid of boxes. See what ^1.2.3 allows and test versions against it. See the exact value a float stores and why 0.1 + 0.2 is not 0.3.
: Paste git, ls, grep or test output and see it shortened the way rtk does for AI agents, with token counts before and after.
: Every tool now answers common questions on the page in short, plain English. Buttons show an icon with their word, and the password generator has a Regenerate button.
: Count tokens with the real GPT-4o and GPT-4 tokenizers and see every split; watch temperature, top-k and top-p reshape a next-token choice; and work out how much GPU memory a model needs.
: Each suggestion now previews the result before you open it, offers every way forward, and recognises CSV, YAML, status codes, hashes and measurements too.
: Type "base64 decode" or "timestamp to date" and the result opens the tool already set that way.
: Pin a tool to show it first on the home page. Each tool also reopens with the direction and options you last chose.
: Build a cron expression from five menus, and see the next runs in the time zone your scheduler uses, daylight saving included.
: Two JSON documents with keys in a different order now show no differences, and line diffs get a side-by-side view.
: Paste a UUID into the UUID Generator to see its version, variant and, for v1, v6 and v7, when it was made.
: Any tool you have opened keeps working with the network off. It is also the simplest proof that nothing you type is uploaded.
: Thirty common regular expressions, thirty-six unit conversions and thirty-nine cron schedules, each a pre-filled working tool.
: The regex tester explains each part of a pattern and gives it back as JavaScript, Python or Go.
: Paste a log to convert every timestamp in it; JWTs say "expired 3 days ago" and warn about weak secrets; URLs split into an editable query table.
: Drop a file on any hash tool to hash it, of any size, and paste the published checksum to see whether it matches.
: Base64 that decodes to an image or a file now shows a preview and a download instead of garbled text.
: Trailing commas, comments, single quotes, unquoted keys and Python True/None are fixed automatically, and it tells you what it changed.
: Paste into the box on the home page and it works out what you have (a JWT, JSON, a timestamp…) and opens the right tool. Tools also suggest a better one when you are in the wrong place.