Use-case online tools

Developer Converter Tools

Developer utilities for common encoding, decoding, generation, and inspection tasks.

url base64 jwt uuid converter10 tools

Useful For

Encode and decode URLs

Inspect JWT payloads

Generate UUIDs and passwords

Which Tool Should I Use?

URL Encoder DecoderChoose this when you need to handle: Encode, decode, and inspect URL strings and query parameters.Try an example first, then check real values, units, and whether the output should be shared.Base64 Encoder DecoderChoose this when you need to handle: Encode plain text to Base64 or decode Base64 back to text.Try an example first, then check real values, units, and whether the output should be shared.HTML to Markdown ConverterChoose this when you need to handle: Convert blog, docs, and email HTML snippets into Markdown for GitHub, Notion, and README files.Try an example first, then check real values, units, and whether the output should be shared.HTML Entity Encoder DecoderChoose this when you need to handle: Encode HTML special characters into entities or decode entity strings back to text.Try an example first, then check real values, units, and whether the output should be shared.JWT DecoderChoose this when you need to handle: Decode JWT header and payload directly in your browser.Try an example first, then check real values, units, and whether the output should be shared.

Tools In This Set

URL Encoder DecoderEncode, decode, and inspect URL strings and query parameters.Base64 Encoder DecoderEncode plain text to Base64 or decode Base64 back to text.HTML to Markdown ConverterConvert blog, docs, and email HTML snippets into Markdown for GitHub, Notion, and README files.HTML Entity Encoder DecoderEncode HTML special characters into entities or decode entity strings back to text.JWT DecoderDecode JWT header and payload directly in your browser.Regex TesterTest regex patterns, flags, groups, and replacements directly in your browser.UUID GeneratorGenerate and copy UUID v4 values in your browser.Password GeneratorGenerate random passwords locally with length and character options.Data URI ConverterConvert text content into a data: URI for small inline assets and snippets.MIME Type LookupLook up common MIME types from filenames or file extensions.

Suggested Workflow

01Start with URL Encoder DecoderEncode, decode, and inspect URL strings and query parameters. Use an example first to understand the input and output format.

02Continue with Base64 Encoder DecoderEncode plain text to Base64 or decode Base64 back to text. Use related tools in the same set to avoid repeated manual work.

03Check with HTML to Markdown ConverterCopy the final output or reopen the example link to confirm the workflow.

Before You Use These Tools

Treat developer tool output as a draft

URL encoding, Base64 conversion, regex testing, and JWT decoding are useful for quick checks, but they may not match every production runtime. Re-test copied values against your runtime, security rules, and browser support.

Avoid real production secrets

JWTs, passwords, and API keys can be exposed through screenshots, browser history, or shared context. Use sample values or expired tokens when checking structure, and handle live secrets in dedicated security workflows.

Compare before and after conversion

Encoding and decoding can be affected by whitespace, special characters, Unicode, and line breaks. Confirm the meaning is preserved, and combine formatters or parsers when working with structured JSON or URLs.

FAQ

Can I paste tokens or passwords?

Use browser-local tools for sensitive values where possible, but avoid pasting production secrets.

Does the JWT decoder verify tokens?

It helps read JWT payloads. Signature validation and permission checks should still happen in your real server environment.

Where are generated values stored?

Generated UUIDs, passwords, and Data URIs are handled on the page by default, and you copy only the values you need.