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Base64 Decoder

Decode Base64 strings online to recover the original text, JSON, or binary data behind opaque encodings.

base64decodeconvert

Formatting Options

Preview the shared config renderer across simple, choice-based, and multi-select settings.
Alphabet handling

Choose how the decoder should interpret incoming Base64 characters.

Strip data URI prefix

Ignore data URI metadata before decoding Base64 content.

Decoded output

Choose whether the decoded content should be shown as text or bytes.

Interpret decoded bytes as text.

Overview

That long string in an API response or a data URI—what is it? Decode base64 to text, JSON, or raw bytes and find out. Base64 to text, base64 decode tool for inspecting payloads, debugging data URIs, or recovering content from encoded config. Convert base64 to string when you need to see what's behind the encoding. Decode base64 online locally.

Features

  • Base64 Decoding

    Turn Base64 text back into readable content instantly

  • Quick Inspection

    Check encoded payloads without leaving the browser

  • Copy Ready

    Review decoded output before using it elsewhere

  • Privacy First

    All processing happens in your browser

Quick Tips
  • •Decode API payloads or data URIs when you need to inspect their contents
  • •Watch for invalid padding if the decoded result looks incorrect
  • •Use decoded output to verify data before storing or forwarding it
  • •All data stays in your browser - nothing is sent to servers

When this tool helps

Practical situations where this tool is worth opening.
  • Inspecting opaque values in API payloads, cookies, or configuration files.
  • Checking what is inside a data URI before embedding or shipping it.
  • Recovering readable text from test fixtures or encoded support examples.

Common mistakes to avoid

A few easy ways these workflows go wrong in practice.
  • Assuming every Base64 value is UTF-8 text when some inputs represent binary data.
  • Ignoring padding or alphabet mismatches between Base64 and Base64url.
  • Treating decoded output as trusted without validating its structure or source.

Worked examples

Short examples that show what this tool is useful for.
Decode readable text

Input

aGVsbG8gd29ybGQ=

Output

hello world

A quick check that the payload contains plain text rather than binary.

FAQ

Clarifications people often need before using the output.

Related guides

Original reading that explains the workflow around this tool.
When Base64 Helps And When It Adds Friction
A field guide to using Base64 for transport, embedding, and debugging without confusing encoding for encryption.

5 min read