Everyday developer tools,
ready when you are.
Base64, JWT, YAML, JSON, URL, timestamps, and more. No signup, with most data processed locally in your browser.
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Choose a tool, paste your input, and get the result.
Base64
Encode Unicode text to Base64 or decode Base64 safely in your browser. No upload, signup, or server processing.
Runs locally EncodingBase64 File
Turn a file into Base64 or download a Base64 data URI as a file. Processing stays completely on your device.
Runs locally Time & AutomationCron Parser
Explain standard five-field cron expressions in plain English and validate common ranges locally.
Runs locally Cloud NativeHelm Debugger
Render and lint a Helm template with the real Helm engine, precise errors, and an ephemeral server-side workspace.
Backend check SecurityJWT Decoder
Decode JWT headers and claims, inspect timestamps, and check expiration locally. Decoding does not verify the signature.
Runs locally Cloud NativeKubernetes Validator
Run a fast Kubernetes manifest preflight for YAML structure, required identity fields, metadata, and common safety issues.
Backend check Cloud NativeKubernetes Secret
Decode every value in a Kubernetes Secret manifest locally and identify invalid Base64 without exposing credentials.
Runs locally SecurityPEM Inspector
Inspect an X.509 PEM certificate, validity dates, subject, issuer, serial number, and SHA-256 fingerprint locally.
Runs locallyA simple set of categories.
Your input stays in the browser by default.
Base64, JWT, YAML, URL, and timestamp tools run locally. Server-side features such as certificate generation and Helm are clearly marked.
Find the cause, then verify the fix.
JWT expired or exp claim validation failed
The token exp timestamp is earlier than the verifier's current time. Decode the claim, confirm seconds versus milliseconds, and obtain a new token through the intended flow.
Verified 2026-08-02 YAMLdid not find expected key
The parser reached a line that cannot belong to the current mapping or sequence. Compare indentation with sibling lines and inspect the previous key.
Verified 2026-08-02 YAMLmapping values are not allowed in this context
A colon is being interpreted as a mapping separator where the parser does not expect one. Check indentation and quote scalar text containing colon-space.
Verified 2026-08-02 Kubernetesfield is immutable
The update changes a field Kubernetes uses as stable identity. Revert that field or plan a controlled replacement.
Verified 2026-08-02