JSON formatter & validator
Format, beautify, validate, and minify JSON online. Pinpoint syntax errors by line and column, sort keys, and copy or download the result.
Open ZIP archives or bundle files into a ZIP privately in your browser.
Works on your device. Your files are never uploaded.
Preparing this page for offline use…
Choose a ZIP to browse and download its files, or select files to create an archive. ZIP only; encrypted ZIPs are not supported. Archives are limited to 250 MB expanded and 2,000 entries to keep your browser responsive.
Files and calculations stay on your device. After this page and its assets have loaded, it works without an internet connection.
ZIP extractor and creator is a free online tool on ReallyUseful.Tools. No account is required.
ZIP extractor and creator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
Format, beautify, validate, and minify JSON online. Pinpoint syntax errors by line and column, sort keys, and copy or download the result.
Encode text to Base64 or decode Base64 back to text with full UTF-8 support and an optional URL-safe alphabet.
Convert Unix epoch timestamps to human-readable dates and back. Supports seconds and milliseconds, local time, UTC, and ISO 8601.
Generate MD5, SHA-1, SHA-256, SHA-512, SHA3, and CRC32 hashes for text or files. Verify checksums and create HMACs locally.
Test JavaScript regular expressions with live match highlighting, capture groups, flags, and replace preview.