Base64 & URL encoder

Client

This workspace handles Base64 (UTF-8 bytes) and URL component encoding (encodeURIComponent / decodeURIComponent) so query keys and values round-trip safely. For whole URLs, encode only the values that need it—not the full URL string.

Part of encoding tools.

Workspace

Paste text, run an action—output replaces the field for a quick copy. Decoding Base64 assumes UTF-8 text; binary that is not valid UTF-8 will show an error.

Base64

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Encode or decode using UTF-8 bytes so Unicode text round-trips correctly. Processing is local in your browser.

Decoding arbitrary binary to UTF-8 may fail if the payload is not text.

URL encoding

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Uses encodeURIComponent and decodeURIComponent for query strings and path segments. Runs entirely on the client.

For full URLs, encode only the pieces that need escaping—encoding an entire URL can break the scheme.

Common use cases

  • Encode query parameter values safely before appending them to URLs.
  • Convert UTF-8 text to Base64 for transport or test fixtures.
  • Decode Base64 text that represents UTF-8 strings—not arbitrary binary blobs.

Common mistakes to avoid

  • Encoding entire URLs with component functions

    Use component encoding for parameter values, not for the full URL. Encoding separators can break routing.

  • Confusing Base64 with encryption

    Base64 is reversible encoding for transport, not a security mechanism.

  • Ignoring UTF-8 assumptions during decode

    Decoding binary payloads as text can fail. Use text-oriented Base64 only when the source is UTF-8 content.

FAQ

When should I use URL encoding here?

Use it when a value contains spaces, symbols, or non-ASCII characters and will be placed in a query string.

Can I use this page for cryptographic protection?

No. This page handles encoding and decoding. Use the encrypt/decrypt tool when you need cryptographic operations.

Does encoding run on the server?

No. Base64 and URL operations in this workspace run in your browser tab.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • base64 encode online
  • base64 decode online
  • url encode decode online
  • encode uri component online

More tools

Related utilities you can open in another tab—mostly client-side.