Base64 & URL Encoder/Decoder Online — Decode Text Safely

Encoding turns data into a representation that is safer to transport through URLs, APIs, files, forms, and binary channels. Decoding reverses that transformation so you can inspect the original text or bytes.

What is encoding?

Encoding is not the same as encryption. Encoding changes format; encryption hides meaning with a key. Base64, URL encoding, hex, binary, and gzip are common tools for moving data safely between systems.

Text: hello world
Base64: aGVsbG8gd29ybGQ=
URL encoded: hello%20world
Hex: 68656c6c6f20776f726c64

Base64 and URL encoding

Base64 represents binary data as text. It is common in data URLs, tokens, email, certificates, and API payloads. URL encoding escapes characters that have special meaning in URLs, such as spaces, question marks, ampersands, and slashes.

• Use Base64 when binary data needs to travel through a text-only system.
• Use URL encoding when putting values into query strings, paths, redirects, or form submissions.
• Use Base64URL for URL-safe tokens such as JWT header and payload segments.

Hex, binary, and gzip

Hex and binary are useful when inspecting bytes, hashes, colors, payload signatures, or low-level protocol data. Gzip compresses content to reduce transfer size, which is useful for logs, API responses, and web assets.

• Hex is compact and common for hashes, byte arrays, and color values.
• Binary shows the bit-level representation of data.
• Gzip compresses repeated patterns and can dramatically shrink text-heavy content.

How to encode and decode using inspectly.dev

1. Open inspectly.dev/encoder
2. Paste your input into the left panel
3. Choose Base64, URL, Hex, Binary, or Gzip
4. Switch between encode and decode modes
5. Copy the output or inspect detected formats

Common encoding mistakes

• Calling Base64 encryption — Base64 is reversible by anyone and should not protect secrets.
• Double URL encoding — %20 can accidentally become %2520.
• Using standard Base64 in URLs — characters like +, /, and = can cause issues unless escaped.
• Decoding the wrong character set — bytes and text need the same encoding assumptions on both sides.

Frequently asked questions

Is Base64 secure?

No. Base64 is an encoding format, not a security boundary. Anyone can decode it. Use encryption, hashing, signing, or access controls when you need security.

Why does my URL encoded value have percent signs?

Percent signs mark escaped bytes. For example, a space often becomes %20 so it can safely travel inside a URL.

What is Base64URL?

Base64URL is a URL-safe variant of Base64 that replaces characters that are awkward in URLs. It is commonly used in JWTs and other compact token formats.