All tools › Things to look up
User agent
A browser's description of itself, read as itself — every one of them claims to be three others.
It runs entirely in this browser tab: nothing you type is uploaded, and the tool makes no network request at all — it does not fetch the address you gave it. Open your browser's network panel and try it.
Settings
- Shape
- Choices: Parts, Table.
How to use it
- Paste your text into the box above, or open a file.
- Adjust the settings beside it until the result is what you wanted.
- Copy the result, or save it as a file. The result updates as you type.
Questions
- Does it fetch the address I give it?
- No, and that is the difference between these tools and most with the same names. Nothing is downloaded, nothing is checked over the network, and no request leaves this page. What is described is the text you handed over. Every tool that could be mistaken for a fetching one says so on its own result.
- Is a length count here a rule?
- No. The widths shown are what each search engine and each social network happens to display, and they are cut by pixels rather than by characters — a line of capitals is cut sooner than a line of lower case. There is no maximum title or description length in any specification, and nothing here pretends otherwise.
- Will this configuration work on my server?
- It is written to the syntax the server you chose reads, and every rule carries a comment saying what it does. Check the whole file before reloading: a rule that needs a module you have not enabled stops the server starting, and the certificate paths in an Nginx block are the usual ones rather than yours.
- Why does a policy tool warn about my own settings?
- Because a rule that blocks the site is worth more than a rule that works. A content security policy that allows inline scripts undoes most of what it is for; a star with credentials is a pair every browser refuses outright; a permanent redirect is remembered by the browser and is hard to take back. Each of those is said where you can still change it.
Other tools for things to look up
Character references
A character found by itself, by name or by number, written for markup, style sheets and code.
Status codes
What a code means and what to do about it, including the pairs that differ in one sentence.
Media types
An extension and a type each find the other, with the header to serve it under.
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