Skip to content
TinkerTools

Free Online Developer Tools

A growing collection of fast, private utilities for developers. Everything runs in your browser — no data is sent to any server, no account required.

JSON

JSON Formatter

Format, validate, and minify JSON data

CSV to JSON

Convert CSV or TSV files to JSON

Base64

Base64 Encoder/Decoder

Encode or decode Base64 strings

Base64 to Image

Convert a Base64 string to a viewable image

Image to Base64

Convert an image file or URL to Base64

Text & Encoding

Diff Checker

Compare two texts and highlight differences

URL Encoder/Decoder

Encode or decode URL components

Date & Time

Epoch Converter

Convert Unix timestamps to human-readable dates

TinkerTools provides 8 free online utilities designed for developers, programmers, and web professionals. Each tool runs entirely in your browser for maximum speed and privacy. From formatting JSON and comparing text differences to encoding Base64 strings and converting Unix timestamps, all tools are optimized for speed and ease of use with no installation or setup required.