Web
- JWT Encode Guide
A JWT is three dot-separated sections: a JSON header, a JSON payload (claims), and a signature. JWT Encode builds and signs a test token when you choose Encode / sign; it does not verify a token or rebuild automatically …
- JWT Expiry Editor Guide
JWTs can contain three time claims measured in seconds since 1970 UTC: iat (issued), nbf (not before), and exp (expires). JWT Expiry Editor decodes a token and lets you change these times; it can re-sign using an HMAC …
- JWT Parser Guide
A JWT is text with pieces separated by dots. One piece describes how it was made; another contains information called claims. JWT Parser lets you read those pieces. Reading a token is not the same as proving it is safe …
- Keycode Info Guide
Browsers describe keyboard presses using key (the character or action) and code (the key’s physical position). Keycode Info shows those values plus older numeric fields and modifiers so you can design a keyboard …
- Meta Tag Generator Guide
Meta tags are lines of HTML that describe a page to browsers and link-preview services. Meta Tag Generator writes description, Open Graph, and Twitter-card tags as text you can copy into a page’s <head>.
- Microphone Recorder Guide
A microphone can be detected by the browser yet still deliver a quiet or silent signal. Mic Tester shows the input level and peak marker, with a recording you can play back to hear what was actually captured.
- MIME Types Guide
A MIME type is a label telling a browser or another program what kind of content it received. For example, a server might send Content-Type: application/json for JSON data. MIME Types is a small table of common …
- OpenAPI Viewer Guide
An API’s request and response shapes can be scattered across paths and schema definitions. OpenAPI Viewer brings them together as a list of operations from a pasted OpenAPI or Swagger document.
- OTP Generator Guide
A TOTP (time-based one-time password) is a short code derived from a shared secret and the current time. OTP Generator shows the current code from a Base32 secret using your browser’s clock.
- PDF Merger Guide
A cover page and an appendix need to land at opposite ends of a merged document. PDF Merger lists the source files in their output order, with controls to rearrange them before downloading the combined PDF.