Dev Tools

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.