zero server round-trips, by design

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

Every tool on this page runs entirely in your browser's own JavaScript engine. Open your network tab and check — nothing you type or paste is ever transmitted anywhere.

Tools

JSON Formatter & Validator

Format, validate, and minify JSON. Catches trailing commas and tells you the line.

JWT Decoder

Decode a token's header and payload, and see its expiry at a glance.

UUID & Hash Generator

Generate UUID v4 values and SHA-1/256/384/512 hashes via Web Crypto.

Regex Tester

Test a pattern against sample text and see matches, capture groups, and replacements live.

Timestamp Converter

Convert between Unix timestamps and human-readable dates, both directions, live.

Why this isn't like other online tools

Most "paste your JSON here" sites work the same way under the hood: your input goes to their server, gets processed there, and comes back. That's fine for a shopping list. It's a real security problem when what you're pasting is an API response with a live key in it, a JWT with a session token in it, or a config file with a database password in it — exactly the kind of thing that ends up in these tools. Once that leaves your machine, you're trusting a server you don't control not to log it, not to get breached, and not to have anyone on the other end glance at it. There's no way to verify any of that from the outside. Vaultools removes the trust requirement instead of asking for it: there's no server in the loop to breach, log, or misuse anything, because parsing happens in your browser's own JavaScript engine — the same one already running this page.

A typical online tool

× Sends what you paste to a server
× No way to verify what happens to it after
× Ads, trackers, or an account wall
× You take their word for the privacy policy

Vaultools

✓ Parses everything in your browser's own JS engine
✓ Zero network requests — open your dev tools and check
✓ No account for any free tool, ever
✓ Nothing to take our word for — you can verify it yourself

See it in action

Recordings of the real tools, not mockups — watch each one format, decode, or hash something in a few seconds before you try it yourself.

How it works →

Who it's for

Built for anyone who'd rather not paste something sensitive into a stranger's server just to format it.

Developers

Decode a token mid-debug, format an API response, or generate a UUID for a fixture — without pasting real data into a site you've never heard of and hoping for the best.

Tinkerers & enthusiasts

People who like knowing how their tools actually work. Every tool here does one small thing you can watch happen — check the network tab, see for yourself, move on.

Anyone learning

Figuring out what a JWT actually contains, or why SHA-256 beats MD5? This is a safe place to try it on something real — even a secret you're about to rotate anyway.

Why go Pro?

Everything above is free forever, no account or signup required. Pro is a $5/mo or $49 one-time upgrade for people who hit copy-paste one too many times:

• Batch processing in most tools (hash, format, regex-test, or convert hundreds of items at once) — JWT decoding has no batch mode yet
• The same batch processing from a CLI, for scripts and CI pipelines
• No ad slot

See pricing →

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) 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 (most tools support it; JWT decoding doesn't yet) 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.