JSON formatter
Check JSON, then format or minify it in the browser.
Developer
Free online tools
Small jobs, finished in one place.
Kiln is a free utility site for formatting, checking, and converting. Open a tool, get a clear result, and come back the next time you need it.
- No account
- Free to use
- Browser tools stay on your device
Browse
Categories
Start with the kind of job you need to do. Each category has its own page.
- TextCount words, compare drafts, and tidy text on your device.
- DeveloperFormat data, encode text, and inspect tokens without an account.
- EmailCheck an address format and public mail records. A result never means the mailbox exists.
- NetworkLook up DNS, response headers, redirects, and public certificates.
- SEORead titles, meta tags, sitemaps, and the files search engines request.
- ImagesResize, compress, and convert images, or create a QR code on your device.
- SecurityInspect public security records and see exactly what the result does and does not prove.
Start here
Featured tools
A short list of tools worth opening first.
JSON formatter Word and character counter Word and character counter
Count words, characters, sentences, and paragraphs as you type.
Text
All tools
Every published utility, in one list.
JSON formatter JSON formatter
Check JSON, then format or minify it in the browser.
Developer
Word and character counter Word and character counter
Count words, characters, sentences, and paragraphs as you type.
Text
Text case converter Text case converter
Change text to upper, lower, title, sentence, camel, pascal, snake, or kebab case.
Text
Base64 encoder Base64 encoder
Encode or decode Base64 in the browser, including Unicode text.
Developer
URL encoder URL encoder
Encode or decode a URL component or a full URI in the browser.
Developer
Unix timestamp Unix timestamp
Convert a Unix timestamp to a date, or an ISO 8601 date to a timestamp.
Developer
Email syntax validator Email syntax validator
Check whether an email address is formatted correctly. This does not prove the mailbox exists.
Email
JWT decoder JWT decoder
Decode a JWT header and payload in the browser. The signature is not verified.
Developer
Text diff Text diff
Compare two texts and see added and removed lines.
Text
QR code generator QR code generator
Create a QR code from text or a URL and download it as PNG or SVG.
Images
Recently used
Saved in this browser after you open a tool. Kiln does not keep this list on a server.
No recent tools yet
Open a tool and it will show up here on this browser. The list stays on your device.
Questions
Do I need an account?
No. Every tool on Kiln is free to open and use. There is no sign-in.
Is it free?
Yes. You can use the tools without paying or creating an account.
Where does my text go?
Tools that can run in the browser keep what you type on your device. If a tool has to look up a public address, its page says so before you run it.