Free Encoding & Decoding Tools Online
Encoding changes representation; it does not encrypt or prove authenticity. Use these utilities to inspect data formats, prepare query values and translate machine timestamps while keeping those limits clear.
Choose a tool and start
Every core workflow is free and available without creating an account.
Base64 Tool
Encode Unicode text to Base64 or decode it back safely.
URL Encoder
Encode query values and decode percent-escaped URLs instantly.
JWT Decoder
Inspect JWT header and payload claims locally without verification.
JSON Formatter
Format, minify and validate JSON with clear browser-side errors.
Timestamp Converter
Convert Unix seconds, milliseconds and human-readable dates.
What to check
- Do not treat Base64 as encryption.
- Decode JWT claims only for inspection unless a trusted library verifies the signature.
- Encode query values rather than an entire URL when building parameters.
From input to result
- 01
Identify the source format and intended output.
- 02
Transform a non-sensitive sample first.
- 03
Check Unicode, timezone and escaping behavior in the consuming application.
Related tool topics
About this topic
What is included in this encoding & decoding collection?+
This page brings together 5 focused ToolMaster utilities that support the same task or workflow.
Can I use these tools without signing up?+
Yes. The core workflow of every listed tool is free and available without an account.
How should I choose between the tools?+
Start with the output you need, read the short description on each card and test the result in its final destination before relying on it.