JWT Decoder & Debugger - No Key Upload, Private Local Tool

Decode and debug JWTs in your browserโ€”no secret key, no uploads. Inspect header/payload, pretty-print JSON, and see a live exp countdown. Paste offline now.

Header
{}
Payload
{}

How to Use

  1. Paste your JWT (often starts with ey...) into the input.
  2. The tool decodes header and payload and formats them as JSON.
  3. Review status: active / expired / not-yet-valid.
  4. Copy the decoded JSON to share internally or debug safely.

Core Features

  • Client-side Decoding: Decode JWTs locally with zero key upload and zero server calls.
  • Expiration Countdown: Calculate remaining time from the exp claim with a live countdown.
  • Visual Payload Inspector: Inspect claims clearly to debug roles, audience, issuer, and scopes.
  • JSON Pretty Print: Beautify header and payload automatically for fast troubleshooting.
  • Keep data private: Tokens stay in memory on your device.

Related Tools

FIRE Calculator 2026 (Inflation Adjusted) | Retirement Gap Simulator

The 2026 FIRE Calculator (Inflation Adjusted). Simulate real purchasing power, analyze retirement savings gaps, and generate a visual wealth roadmap. One-click CSV export for your Excel or Notion finance dashboard. 100% Private, client-side calculation.
Position Size Calculator - Risk-Based Trade Sizing

Calculate trade position size from account balance, risk %, entry, and stop loss. Runs locally in your browser with no uploads, so you can compare risk scenarios before you trade.
PUBG Erangel Interactive Map 2026: Secret Basements & Loot Guide

Struggling to find Erangel secret rooms? Use our 2026 interactive map to locate all 15 red-door entries, key spawns, and T3 loot heatmaps. Privacy-first & free.
PUBG Taego Secret Room Map 2026: Key Spawn & Hidden Locations

Definitive Taego map for 2026. With Error Spaces removed, identify "Blue-Roof" houses for crate-tier loot and Self-AEDs. Privacy-first, forever free.
PUBG Vikendi Map 2026: Bear Caves, Lab Camps & Secret Loot

Vikendi 2026 tactical guide. Track deadly Bear Cave entrances, Lab Camp security keys, and Thermal Scope spawn zones. Avoid Polar Bears, grab loot.
PUBG Rondo Interactive Map 2026: Security Keys & Safes Guide

Master Rondo 2026 with our 8x8 tactical map. Locate every Security Door, Keycard spawn, and Safe for maximum gold. Privacy-first & free.
Universal Image Stamper Pro: SVG & WebP Support, Lossless Annotation 2026

Struggling with blurry markups? EasyTools offers a universal stamper supporting lossless SVG scaling and high-quality WebP export. Preserve transparency and export JSON data locally.
Image Compressor - Reduce File Size, No Uploads

Compress JPG, PNG, and WebP images locally in your browser. Compare before/after size, adjust quality, and download the result with no uploads.

Calculation Logic

  • A JWT is header.payload.signature.
  • We Base64Url-decode the first two parts and JSON.parse them for inspection.
  • We do not verify the signature (verification requires a secret/public key), so readable does not mean trusted.

FAQ

Is it safe to paste my JWT here?

Yes. We never ask for your secret key, and decoding runs 100% in your browser with no uploads.

How to check when a JWT expires?

We read the exp claim and compute the remaining time from now, showing a live countdown.

Is my data safe (local/privacy)?

Yes. Tokens are processed locally and are not sent, stored, or logged by a server.

Is it free? Any limits?

Itโ€™s free. For security, avoid pasting production tokens on shared/public devices.

Can I verify a JWT without a key?

No. Signature verification requires the correct secret/public key. This tool is for decoding and debugging claims only.