# ByteToolBox

> ByteToolBox provides free, privacy-first browser-based developer tools.
> Tools run locally in the user's browser and include JSON formatting,
> Base64 encoding and decoding, hashing, UUID generation, regex testing,
> and timestamp conversion.

## Tools

- [JSON Formatter](https://www.bytetoolbox.com/json-formatter): Format, validate, and debug JSON locally in the browser.
- [Base64 Encoder & Decoder](https://www.bytetoolbox.com/base64): Encode and decode Base64 and Base64URL data.
- [Hash Generator](https://www.bytetoolbox.com/hash): Generate SHA-256 and SHA-512 hashes locally.
- [UUID Generator](https://www.bytetoolbox.com/uuid): Generate UUID v4 values.
- [Regex Tester](https://www.bytetoolbox.com/regex): Test regular expressions against sample text.
- [Timestamp Converter](https://www.bytetoolbox.com/timestamp): Convert Unix timestamps, UTC, and ISO dates.

## Guides

- [Developer Guides](https://www.bytetoolbox.com/blog): Practical references for JSON, Base64, hashing, regex, UUIDs, and timestamps.
- [How to Find and Fix Invalid JSON](https://www.bytetoolbox.com/blog/find-and-fix-invalid-json-examples): Fix trailing commas, unquoted keys, comments, and other common JSON errors.
- [Unix Timestamp to Date Cheat Sheet](https://www.bytetoolbox.com/blog/unix-timestamp-to-date-developer-cheat-sheet): Convert epoch time, seconds vs milliseconds, UTC, and ISO-8601 dates.
- [Verify File Integrity With SHA-256](https://www.bytetoolbox.com/blog/verify-file-integrity-sha-256-checksum): Generate and compare SHA-256 checksums for downloads and release artifacts.
- [Base64URL and JWT Encoding Rules](https://www.bytetoolbox.com/blog/base64url-jwt-api-encoding-rules): When to use Base64 vs Base64URL for APIs, JWTs, and URL-safe payloads.

## About

- [About ByteToolBox](https://www.bytetoolbox.com/about)
- [Privacy](https://www.bytetoolbox.com/privacy)
- [FAQ](https://www.bytetoolbox.com/faq)

## Related sites

- [TextCraft](https://www.textcraft.dev/): Browser tools for counting, cleaning, converting, comparing, and organizing text.
- [SecureTools](https://www.securetools.dev/): Browser security tools for passwords, encryption, 2FA, random data, and privacy.