Free developer tools
Paste it. Read it. Nothing leaves your tab.
Small tools for the encoding and decoding that fills a working day. They run in your browser, they have no way to send what you paste anywhere, and there is nothing to sign up for. No advertising, no analytics, no accounts.
The tools
One job each, done properly.
Each tool is its own page on its own subdomain, and each one is a single self-contained file. Save one to disk and it keeps working with no network at all.
Encode and decode in either direction. Paste anything and it works out which way you meant, reads data URLs, handles the URL-safe alphabet, and tells you what the bytes turned out to be.
ReadyRead the header and claims of a token, with the expiry worked out in your own time zone. Signatures are read, never verified, because verifying one needs a key.
Not built yetPercent-encoding both ways, with query strings pulled apart into their parameters and put back together again.
Not built yetSHA-256 and its relatives, over text or over a file you drop in, computed by the browser's own cryptography.
Not built yetFormatting, minifying, and an error message that points at the character where the document stopped making sense.
Not built yetEpoch seconds, milliseconds and ISO 8601, converted between each other and into whatever your machine thinks the time is.
Not built yetWhy bother
The things you paste into a converter are not harmless.
A token, a config file, a customer record, a response body from a system that is misbehaving. People paste all of it into whatever page a search turns up, and that page is usually funded by advertising.
The browser enforces it
Every page ships connect-src 'none', which makes fetch,
XMLHttpRequest, WebSocket, EventSource and
sendBeacon fail at the browser level. Not by convention. By policy.
The build checks it
Policy cannot disable everything, so the build rejects the rest: WebRTC, programmatic navigation, service workers, and every form of browser storage. It then inspects the finished file and refuses to publish one that has stopped being self-contained.
Nothing is remembered
No cookies, no local storage, no session storage, no IndexedDB. There is no account to make and no preference to save. Close the tab and there is nothing left behind.
Do not take our word for it
Check it yourself in about a minute.
- Open a tool, then open your browser's developer tools.
- Switch to the Network tab and reload the page.
- Paste something in and use it. The list should show the document itself and nothing else, however long you keep going.
- While you are there, look at View Source. The policy is in the head of the page and the whole application is in the same file.
These are free, and they stay free.
There is no paid tier and nothing is being upsold, because the moment a tool like this has a business model built on attention, the incentives point the wrong way. If they save you some time, you can put something towards the hosting.