The daily decoders, together
Decode JWTs, convert Base64 and URL strings, translate Unix timestamps, generate UUIDs and ULIDs, and test regex — all in one popup.
jwt · base64 · regex
DT
Developer tools · Utilities
Dev Toolbox decodes JWTs, Base64 and timestamps in one popup, fully offline.
Paste a token, a string or a Unix timestamp and get the answer without opening another website. Free, local-first and built to replace the "paste your JWT here" sites.
Recommended for your browser
Choose where to install
Official stores are the safest choice and provide automatic updates.
CH
Chrome
Detected: Chrome
Other browsers
Developer / manual installation
Use the ZIP only when an official store is unavailable.
- Unzip the file, open the browser's Extensions page, enable Developer mode, then choose Load unpacked.
Manual installations do not update automatically. ZIP files are not one-click installers.
Completely free · no paywall
product screenshot · Dev Toolbox popup
product screenshot · Dev Toolbox onboarding
product screenshot · Dev Toolbox options
product screenshot · Dev Toolbox jwt-workflow
product screenshot · Dev Toolbox regex-guardrail
Nothing to paste online
Tokens and secrets never belong on someone else’s website. Every tool runs locally, with no network calls.
no uploadFree by design
No account, no paywall and no tracking. It exists to make our paid tools easier to trust.
freePrivate by construction
local-first · optional online features disclosed · no data sold
- No analytics
- No telemetry
- No third-party SDKs
- Core processing stays local; optional sync, backup, AI or sharing connects only when you enable it
Questions people ask
Is Dev Toolbox free?
Yes. It is a free extension with no account requirement and no paid upgrade.
Do my tokens leave the browser?
No. Decoding, conversion and generation all run locally. The extension requests no site access and makes no network requests.
Which tools are included?
A JWT decoder, Base64 and URL converters, a Unix timestamp converter, UUID and ULID generators, and a regex tester.
Questions & suggestions
Ask a question, request a feature or report an issue. We read every message and publish the useful ones with our answer.
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