FreeFixy

All tools / Developer tools

Untangle the technical bits

Validate and format JSON, inspect a local file, or calculate its SHA-256 hash in your browser.

Choose your task

Runs in your browser · no upload

JSON workspace

Up to 2,000,000 characters. Formatting preserves original number and string tokens, including large integers. Duplicate object keys are retained.

File information & SHA-256

Up to 100 MiB. Shows the name, MIME type, byte size, last-modified date and SHA-256 digest. A hash can help compare files; it does not check whether a file is safe.

Supported scope: JSON: 2,000,000 characters and 128 nesting levels. File hashes: up to 100 MiB. SHA-256 requires browser Web Crypto; files stay in this browser.

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