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Validate Base64

Inspect Base64 and Base64URL strings live. Detect alphabet, padding, and data URIs — then repair, normalize, convert to URL-safe, or MIME-wrap.

PrivateIn your browserInstantUnlimited

16 characters

Valid standard Base64.

  • Length: 16 raw · 16 without whitespace
  • Decoded size: 10 bytes
  • Trailing padding: 2 (=)
  • Alphabet: standard (+/)

How it works

1

Paste Base64

Drop in standard Base64, Base64URL, or a data:...;base64,... URI. Analysis updates as you type.

2

Read the status

See whether the string is valid, which alphabet it uses, padding count, decoded byte length, whitespace, and data-URI detection.

3

Repair or convert

Repair strips noise and fixes padding. Normalize re-encodes standard Base64. To Base64URL switches alphabet. MIME wrap inserts 76-character lines.

What is a Base64 validator?

A Base64 validator checks that a string uses a legal alphabet and padding, and can decode to bytes. This page also repairs common issues and converts between standard Base64, Base64URL, and MIME-wrapped forms in your browser.

Why use this tool

  • Live Base64 / Base64URL validation
  • Alphabet, padding, and byte stats
  • Data URI detection
  • Repair, normalize, URL-safe, MIME wrap
  • Copy and download cleaned output
  • Unlimited use — no daily cap

Questions

What does Validate Base64 do?

It checks whether a string is valid Base64 or Base64URL and can repair whitespace, fix padding, switch alphabets, or wrap for MIME.

What is the difference between Repair and Normalize?

Repair cleans the input (strip data URI, whitespace, pad) into a decodable form. Normalize decodes then re-encodes as canonical standard Base64.

What does mixed alphabet mean?

The string contains both standard (+/) and URL-safe (-_) characters. That usually means two encodings were concatenated by mistake.

Is my input sent to a server?

No. Validation runs entirely in this tab.

Is there a daily limit?

No. This tool has no daily cap.

Do I need an account?

No. Open the page and use it.

Does it work on a phone?

Yes. It runs in the mobile browser.

If Easy24 helped, buy a coffee

Tools stay free in your browser. One-time thanks via Kreosus. Turkish cards work.

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