Tool category
Encoding Tools
Encode, decode, inspect, and hash text locally using browser APIs. Every tool on this page is designed to process data locally in your browser. Nothing is uploaded for normal tool usage.
- Base64 Encoder / Decoder Encode text to Base64 or decode Base64 back to text without sending it to a server.
- JWT Decoder Decode JWT headers and payload claims locally so you can inspect tokens without uploading them.
- SHA256 Hash Generator Generate SHA hashes from text locally using the browser Web Crypto API.
- URL Encoder / Decoder Encode unsafe URL characters or decode percent-encoded strings without sending URLs anywhere.
Common encoding and decoding workflows
Use these encoding tools when inspecting tokens, encoding URLs, decoding Base64 strings, generating hashes, or reviewing security-adjacent data.
- Decode Base64 strings to inspect readable text or encoded payloads.
- Encode text into Base64 for testing or transport-safe examples.
- Decode JWT headers and payloads for debugging authentication claims.
- Generate SHA-256 hashes for checksums or deterministic identifiers.
- Encode and decode URL components when testing query strings, callbacks, or redirects.
Decoder, encoder, hash generator, or JWT decoder?
Use Base64 tools for reversible encoding, URL tools for safe query and path values, SHA-256 for one-way hashing, and JWT Decoder for inspecting token header and payload data. JWT decoding does not verify signatures.
Why use private encoding tools?
Developer tools often handle data that should not be sent to unknown servers: API payloads, export files, configuration documents, token claims, logs, identifiers, and production-like samples. Browser Data Tools keeps the working area simple and runs processing in the browser so you can inspect, convert, and clean data with less risk.
These tools are designed for everyday development, debugging, testing, content cleanup, and data preparation. They are useful when you need a quick result without installing software, creating an account, or uploading working data to a remote API.
How to use these tools
- Open the tool that matches your input and output format.
- Paste a small sample or load a local file where supported.
- Check the available options before processing.
- Run the tool and review the result carefully.
- Copy or download the output when it looks correct.
Privacy notes
For normal usage, processing happens inside the browser using client-side JavaScript and browser APIs. Some tools may use Web Workers to keep the interface responsive while handling larger inputs.
Even with browser-based processing, you should avoid pasting production passwords, private API keys, customer records, medical records, financial records, or highly confidential business data unless your organization allows it.
Frequently asked questions
Does JWT Decoder verify signatures?
No. It decodes the token header and payload for inspection. Decoding a JWT does not prove that the token is valid, trusted, or unmodified.
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone can decode Base64 text.
Should I paste production tokens?
Avoid pasting live secrets or production tokens unless you understand the risk and your organization allows it.