Diff Tools for Developers: Finding What Changed Between Two Files
Diff tools reveal exactly what changed between two versions of text, code, or data. Learn how diff works, the formats it produces, and compare any text instantly free.
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Tool Guides
In-depth guides to using developer tools effectively — from formatters and converters to generators and testers.
QR Codes for Developers: When, Why, and How to Generate Them
QR codes aren't just for menus — developers use them for app links, Wi-Fi sharing, 2FA setup, deep links, and local dev testing. Learn how they work and generate them free.
Read Article10 Text Tools Every Developer Should Bookmark
From word counters to diff checkers, these free browser-based text tools solve the small problems that slow developers down every day. All free, no sign-up needed.
Read ArticleHow to Format and Validate JSON Online Without Installing Anything
Raw JSON is nearly impossible to read. Learn how to format, validate, and debug JSON instantly in your browser — no tools to install, no accounts to create.
Read ArticleTry the tools yourself — free.
Format, encode, generate, and convert — everything runs client-side. No account needed.