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Free developer tools that never send your data anywhere.

Vaultools formats JSON, decodes JWTs and certificates, encodes Base64, URLs and HTML, explains cron schedules and Unix permissions, and more. Every tool runs on your device, so there’s no account and nothing to upload.

Paste tokens, JSON and configs without handing them to a stranger's server.

Don’t take our word for it: open your network tab and check.

Format Identifier

Not sure which tool you need?

Paste it and the Format Identifier tells you, then opens the right one. It never leaves your device.

eyJhbGciOiJIUzI1Ni… opens in JWT Decoder
-----BEGIN CERTIFICATE----- opens in X.509 Certificate Decoder
0 9 * * 1-5 opens in Cron Expression Explainer
drwxr-xr-x opens in chmod Calculator

Open the Format Identifier

Tools

Tokens & security

Inspect tokens, certificates and IDs.

Encoding

Convert text for URLs, HTML and Base64.

Data & text

Clean up JSON and test patterns.

Time & systems

Read timestamps, schedules and permissions.

Help me choose

Paste it, and we’ll point you to the tool.

Format Identifier Paste anything to find out what it is (a JWT, JSON, a certificate, Base64, a cron schedule and more), then open it in the right tool.

Why this isn’t like other online tools

Most “paste your JSON here” sites process your input on their server, which is a real risk when it holds a live API key or session token. Here there is no server in the loop at all.

How it works, with recordings →

A typical online tool

Sends what you paste to its server
No way to see what happens to it next
Ads, trackers or an account wall
You take its privacy policy on trust

Vaultools

Runs in your browser’s own JavaScript engine
Zero network requests: check your dev tools
No account for any free tool, ever
Nothing to take on trust: verify it yourself

The JSON formatter showing formatted output

See it in action

Real recordings of every tool, not mockups.

Watch the demos →

Pro · $5/month or $49 once

Hundreds of items at once, and CI checks in the CLI

Batch mode in the browser, the same from the command line, and no ads. Every tool stays free.

See Pro →

Questions

Do you store or see what I paste?

No. Every tool runs entirely in your browser's own JavaScript engine — nothing is ever sent to a server. Open your browser's dev tools while you use any tool and check the network tab yourself.

Why should I believe that?

Don't — verify it. Every tool page shows a live "network requests sent: 0" counter, and your own dev tools will show the same thing: zero requests while you paste, format, decode, or hash.

Is it free?

Yes, fully — every tool is free with no account, no signup, and no limits. Pro adds batch processing (in the browser and via a CLI), CLI checks for CI pipelines, and removes the small ad on pages like this one; see the Pro page for details.

Does Pro change the privacy model?

No. Pro only unlocks batch processing (the JSON, hash/UUID, regex and timestamp tools support it; the JWT, certificate, Base64, URL, cron, chmod and HTML entity tools don't yet), the CLI's CI checks for certificates, crontabs and file permissions, and hides the ad slot on non-tool pages. It doesn't add tracking or an account — just a license key, stored locally in your browser or, for the CLI, in a local config file.