Developer Tools
This page is a directory of free, no-signup developer utilities: Base64 encoding/decoding, JWT decoding, MD5/SHA-1/SHA-256 hashing, UUID generation, a random password generator, a URL encoder/decoder, a Punycode/IDN converter and a User-Agent parser. Every tool listed below runs entirely client-side, with no account required — each tool's own page states its exact privacy model.
Unlike the network/IP tools in the main tools directory, nothing here is about an IP address, subnet or ASN — this subsection targets the general web-developer toolbox instead: encoding and decoding data, inspecting tokens, computing checksums, and generating identifiers. The audience overlaps (developers use both clusters), but the search intent doesn't, which is why this lives in its own subsection rather than mixed into the network tool list.
Privacy matters more here than for most tools, since a JWT or a hashed string can carry sensitive data — every tool below runs the computation in your browser, in JavaScript, with no network request involved (WebCrypto for SHA-1/SHA-256, a local implementation for MD5, and crypto.getRandomValues for UUID generation — never Math.random()). The JWT decoder in particular states, prominently on its own page, that it never verifies a signature and never transmits the token you paste anywhere.
Tools in this section
- Base64 Encoder / Decoder Encode text to Base64 or decode it back, with full Unicode support.
- JWT Decoder Decode a JSON Web Token's header and payload — signature never checked, token never sent anywhere.
- Hash Generator (MD5/SHA-1/SHA-256) Compute MD5, SHA-1 and SHA-256 hashes of any text — with a clear warning about where MD5 is (and isn't) safe to use.
- UUID Generator Generate cryptographically random UUID v4, v1 or v7 identifiers, one at a time or in bulk.
- Password Generator Configurable-length passwords from crypto.getRandomValues, with selectable character sets.
- URL Encoder / Decoder encodeURIComponent/decodeURIComponent-style URL encoding, with an explanation of component vs full-URL encoding.
- Punycode / IDN Converter Convert an internationalized domain name (with non-ASCII characters) to and from its ASCII-compatible Punycode form.
- User-Agent Parser Parse any User-Agent string into OS, browser, engine and device, with a one-click fill from your own browser's string.
Glossary
- Base64
- An encoding scheme that represents binary data using 64 printable ASCII characters, so it survives text-only transport like email or URLs.
- JWT
- JSON Web Token — a compact, signed token format carrying a JSON payload of claims, widely used for authentication and authorization.
- Hash function
- A deterministic function turning input data of any length into a fixed-length digest, practically impossible to reverse.
- UUID
- Universally Unique Identifier — a 128-bit value designed to be generated without central coordination while remaining globally unique in practice.
- WebCrypto
- The browser's built-in cryptography API (window.crypto.subtle and crypto.getRandomValues) — the source of SHA-1/SHA-256 hashing and all random bytes used across this subsection.
- Client-side
- Computed entirely in your browser's JavaScript, with no data sent to any server — the execution model every tool in this subsection uses (see each page's own privacy statement for the precise wording).
API equivalent
These developer utilities have no API equivalent in our service — Base64/JWT/hashing/UUID aren't IP-address facts, so there's nothing for our API to return here. Every computation runs entirely on your device. If you're looking for our IP-lookup API instead, it covers geolocation, ASN/network and threat/fraud data for an IP address:
Frequently asked questions
- Are these tools really free?
- Yes — every tool in this subsection is free, with no signup, no account and no usage limit, since each one runs entirely in your browser rather than calling a metered server endpoint.
- Is any of my data sent to a server?
- No — every tool listed above computes its result entirely in your browser's JavaScript. Nothing you type or paste into a Base64, JWT, hash or UUID tool on this subsection is ever transmitted anywhere.
- Why is this a separate subsection from the main tools directory?
- The main tools directory covers network/IP-address tasks (subnetting, DNS, ASN lookups); nothing here is about an IP address at all. Keeping the two clusters separate keeps each one's topic focused, both for you and for how search engines understand the page.
- Will more developer tools be added to this section?
- Possibly — this subsection may grow over time, and any new tool appears here, linked, the same day it ships. There's no fixed roadmap published on this page.
- Do I need an account to use these tools?
- No — none of the tools in this subsection require an account, a login, or any personal information at all.
- Which tool should I use to inspect a login token?
- If it's a JSON Web Token (three dot-separated segments), use the JWT Decoder — it handles the Base64URL decoding and JSON formatting for you. For a plain Base64 string that isn't a JWT, use the Base64 tool instead.
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