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Text Encoding Converter
Convert between Text, Base64, Binary, Hexadecimal, and Decimal formats.
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Developer Tools
Format JSON, convert encodings, and translate Unix timestamps — the utilities you open ten times a day.
3 tools in this category
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JSON Formatter
Validate, format, and minify JSON data with syntax highlighting.
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Unix Timestamp
Convert between Unix timestamps and human-readable dates.
Use Tool ➜About Developer Tools
TechCompare's developer tools are the small utilities you reach for a dozen times a day: a JSON formatter that pretty-prints and validates with clear error messages, an encoding converter that moves text between UTF-8, Base64, binary, hex, and decimal, and a Unix timestamp converter that handles seconds, milliseconds, and timezones in both directions.
All three run entirely in the browser, so you can paste production payloads without worrying about a server logging them. They're designed to be fast enough to belong in your muscle memory — open the tab, paste, copy the result, close the tab.
Frequently asked questions
Does the JSON Formatter send my data anywhere?
No. Formatting, validating, and minifying all happen in your browser via the built-in JSON.parse and JSON.stringify APIs. You can disconnect from the internet after the page loads and it continues to work.
Can I decode a JWT with the Encoding Converter?
Yes — a JWT is three Base64URL-encoded segments separated by dots. Paste the header or payload segment and convert from Base64 to text to see the decoded JSON. Note that this doesn't verify the signature; it just reveals the contents.
Why is my Unix timestamp giving me a date in 1970?
You're almost certainly passing a seconds value to a milliseconds API, or vice versa. The Unix Timestamp tool detects the magnitude automatically and shows both interpretations side-by-side, so you can tell at a glance which unit you actually have.
Can the JSON Formatter handle huge payloads?
It can handle anything your browser's memory can hold — typically tens of megabytes without issue. For multi-GB files use a streaming tool; for anything you'd reasonably paste, it's fine.
Are these tools free for commercial use?
Yes. No accounts, no rate limits, no paid tier. They're free to use at work, on personal projects, or anywhere else.