Fast, private developer utilities

Format JSON, convert YAML and XML, decode JWTs, encode Base64, test regex, generate hashes, and encode URLs — all in your browser.

No uploads for standard tools. No backend processing. Your data stays local.

Find the right tool

Search by task, format, or keyword and jump directly to the tool page.

Tip: try “jwt”, “sha256”, or “yaml”

Format, validate, minify, visualize, and convert JSON to YAML or XML.

Decode JWT claims, inspect headers, check expiration, and verify signatures.

Encode text to Base64 or decode Base64 and Base64URL back to UTF-8.

Test regular expressions with live match highlighting and capture groups.

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes.

Encode and decode URLs and URL components instantly.

Standard tools run locally in your browser, so sensitive payloads, tokens, and configs do not need to be uploaded.

Open a focused tool page, paste your data, and get results instantly without account creation or setup.

Install utills.dev and launch JSON, JWT, Base64, regex, hashes, URL encoding, and converters from one app.

Read practical guides for Base64, JSON, JWT security, YAML configuration, data encoding, and common web data formats.