Developer Tools

Browse all DevToolsify tools by category. Free, privacy-first tools — most run entirely in your browser.

What is Base64? Base64url vs Base64 JWT claims explained JWT signature verification Common JSON parse errors

Encoders

  • Base64 Encoder

    Encode text, images, and files to Base64 format with URL-safe encoding support and real-time conversion.

Decoders

  • Base64 Decoder

    Decode Base64 strings to plain text with automatic data URI detection, image preview, and file upload support.

  • JWT Decoder

    Decode JSON Web Tokens (JWT) to inspect header, payload, and signature. Interprets standard claims like exp, iat, and nbf with human-readable timestamps.

Formatters

  • JSON Formatter

    Beautify, minify, and validate JSON with inline error detection and syntax highlighting. Format JSON instantly in your browser.

  • Diagram Viewer

    Render and preview diagrams from plain-text source (Mermaid, PlantUML, GraphViz, and more) with export options like SVG/PNG/PDF.