Are NanoTools completely free to use?

Yes, all basic tools on NanoTools are completely free to use with no registration required. We offer premium features for power users.

Is my data secure when using NanoTools?

Your files are processed securely and are automatically deleted after processing. We do not store your files or data on our servers.

Do I need to install any software to use NanoTools?

No installation required. All tools work directly in your browser on any device - computer, tablet, or smartphone.

What file formats are supported?

We support a wide range of formats including PDF, JPG, PNG, WebP, GIF, JSON, XML, CSV, and many more depending on the tool.

NanoTools

Pricing

NanoTools

Free, fast and privacy-first online tools — convert, compress, edit and optimize files, minify code, and access handy developer utilities. Trusted for quick PDF, image and text workflows with instant results.

Tools

PDF Tools
Image Tools
Video Tools

Popular Tools

API Tester
JWT Decoder
JSON Formatter
QR Generator
Image Compressor

Contact

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JWT Decoder

Decode and inspect JSON Web Tokens (JWT)

Header

Payload

Signature

Encoded JWT

About JWT Decoder

JSON Web Tokens (JWT) are a compact, URL-safe means of representing claims to be transferred between two parties. This tool decodes JWTs to inspect their header and payload contents, and can verify signatures.

Header

Contains token type and signing algorithm

Payload

Contains claims (user data and metadata)

Signature

Verifies the token hasn't been altered

Security: This decoder runs entirely in your browser. No data is sent to any server.