Free developer tools

Everyday tools that never see your data.

Compare JSON, diff files, encode, hash, and convert — all of it runs inside your browser. Nothing you paste is uploaded, logged, or stored on a server.

Try JSON Compare Browse all tools

Compare

JSON Compare

Diff two JSON documents structurally, then format, validate, or minify them.

File Compare

Line-by-line diff of two text files or pasted snippets.

Encode & decode

Base64

Encode and decode Base64 text.

URL Encode

Percent-encode and decode URL components.

JWT Decoder

Inspect the header and payload of a JSON Web Token.

Generate

Hash Generator

SHA-1, SHA-256, SHA-384, and SHA-512 digests.

UUID Generator

Generate v4 UUIDs in bulk.

QR Code

Turn any text or URL into a scannable QR code.

Convert

Timestamp Converter

Convert between Unix timestamps and human dates.

Color Converter

Convert colors between HEX, RGB, and HSL.