Data Encoding and Cryptography: Local Hasher & Base64 Manual

There's a post on a developer forum I stumbled across a while back where someone casually mentioned they'd been using an online MD5 tool to hash passwords before storing them in a test database. Multiple people in the replies had to gently explain why that was a problem - not just the MD5 part, but the "online tool" part.

When you paste a string into a web-based hasher, it goes to a server. Most of the time nothing bad happens. But "most of the time" is not how you want to approach password handling or API key encoding. You don't actually know what the site does with input it receives.

Client-side means the string never travels

The AllToolGPT Base64 Tool and Cryptographic Hashers run entirely in your browser. The computation happens locally - in your machine's memory - and nothing is transmitted. You get bcrypt, MD5, SHA256, and Base64 encoding and decoding, all with the same guarantee: your string stays on your device.

For day-to-day development work, I use this constantly. Checking a checksum against a downloaded file. Encoding a config value for an environment variable. Decoding a Base64 payload from an API response to see what's actually in it. These are five-second tasks and having a clean, trustworthy tool for them in a browser tab is genuinely better than reaching for the terminal every time.

If you're ever dealing with anything that could be considered sensitive - and in dev work, a surprising amount of it is - running these operations locally just makes sense.