How it works
Paste a JWT to decode its header and payload JSON locally. Tokens are not verified against remote services here.
Inspect JSON Web Token headers and payloads locally.
JWT string
Paste a JWT to decode its header and payload JSON locally. Tokens are not verified against remote services here.
Conversions run in your tab with JavaScript — no desktop app required.
Files stay on your device during processing. We do not receive your uploads.
Heavy codecs and AI models run locally via Web Workers and WASM (FFmpeg.wasm, Transformers.js).
Paste a JWT to decode its header and payload JSON locally. Tokens are not verified against remote services here.
Signature verification and JWKS fetching are not performed — do not trust unverified tokens for authorization. Processing is 100% offline in your browser — files never leave your device.
Yes. This tool is free convert online with no signup. Processing stays in your browser — no uploads.
You control quality settings. Choose higher quality for no quality loss when converting online.
Every conversion runs inside your browser tab using JavaScript and Web Workers. There is no background server queue and no account is required for core tools.
Your files are never uploaded to FreeConvertKit for processing. Originals, previews, and exports stay on your device unless you choose to download or share them yourself.
When codecs or AI models are needed, WebAssembly modules such as FFmpeg.wasm and Transformers.js execute locally — giving you desktop-class power with absolute file privacy.
Convert HEX, RGB, and HSL with a live preview.
Generate SHA-256 and other hashes from text in the browser.
Encode text or files to Base64 without uploading anywhere.
Beautify, minify, and validate JSON with syntax highlighting in the browser.