MultiDevTools — Free Online Developer Tools
MultiDevTools is a free, privacy-first collection of browser-based
developer tools. No data is ever sent to external servers — everything
runs locally in your browser.
Available Tools
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JSON Formatter — Parse, pretty-print, and minify
JSON with syntax highlighting.
-
Text Diff — Compare two texts side by side and see
additions, deletions, and unchanged lines.
-
JSON to Class — Convert JSON objects into
TypeScript interfaces or Python dataclasses automatically.
-
JWT Decoder — Decode JSON Web Tokens to inspect
headers, payloads, and expiration status.
-
Base64 Encoder/Decoder — Encode and decode Base64
strings, with image preview support.
-
Regex Tester — Write and test regular expressions
with real-time match highlighting and capture groups.
-
SQL Formatter — Format and beautify raw SQL queries
for better readability.
-
UUID Generator — Generate random UUIDs (v4) in bulk
with one click.
-
Log Prettifier — Format production JSON logs and
extract embedded SQL queries for easy reading.
Please enable JavaScript to use these tools.