CSV to JSON Converter

Convert CSV (with quoted fields) into JSON, pretty JSON, or transpose rows and columns. In your browser, nothing uploaded.

File Hash Checker

Compute the SHA-256, SHA-1 or SHA-512 checksum of any file to verify its integrity. The file never leaves your browser.

JSON Formatter & Validator

Format, minify, validate, sort keys, or convert JSON to CSV. Real parsing in your browser — nothing uploaded.

JWT Decoder

Decode a JSON Web Token to see its header and payload. Runs entirely in your browser — your token is never sent anywhere. Decode only (no signature verification).

Markdown to HTML

Convert Markdown into clean HTML — headings, bold, italics, code and links. In your browser.

Unix Timestamp Converter

Convert Unix timestamps to ISO 8601 dates and back. Supports seconds and milliseconds. Runs in your browser.