Why does my Base64 decode to garbage?

If the original data was binary (e.g., an image or compressed file), decoding to text will show unreadable characters. The data itself is correct; it just is not meant to be interpreted as text.

What if the padding is missing?

DevDash automatically adds missing = padding before decoding, so truncated Base64 strings are handled gracefully.

Can I decode Base64 images?

This tool decodes to text. For image data, you would need to interpret the binary output as an image format (PNG, JPEG, etc.).

Base64 Decode

Encoding Tools

Decode Base64 strings to plain text

By DevToolHQ teamUpdated 2026-04-15100% client-sideMethodology

100% client-side processing

Base64 Input

About Base64 Decode

Converts Base64-encoded strings back to their original content. The tool handles standard Base64 (with + and /), URL-safe Base64 (with - and _), and is tolerant of missing or incorrect = padding — a common source of errors when Base64 strings are copied from different systems or truncated. Decoding fails with garbage output in two situations: the input was not valid Base64, or the original data was binary rather than text. If you are decoding the payload of a JWT, the output will be readable JSON. If you are decoding an embedded image, the output will be binary data that looks garbled as text — the data itself is correct but needs to be interpreted as the appropriate binary format (PNG, JPEG, etc.) rather than as a string. A common debugging scenario: you receive a JWT and want to inspect the claims without using a dedicated JWT tool. Paste the middle section (between the first and second dots), decode it, and get the raw JSON payload. Similarly, API responses that embed binary data as Base64 (file contents, cryptographic signatures, public keys in PEM format) can be decoded here to inspect the raw content. The URL-safe variant is automatically detected based on the presence of - or _ characters.