Base64 Decoder Online Free — Base64 to Text

Base64 Decoder — decode Base64 to text error runs in your browser · nothing uploaded

⌃⏎ run · ⎋ clear · / focus input

BASE64 ⇅ upload

⇅ drop a file to load it

TEXT

send output to

no matches

Handles pastes up to ~5MB smoothly in your browser — bigger files still work, just budget a second or two.

Base64 Decoder Online

Updated 2026-07-09

Decode Base64 to plain text online, instantly and privately in your browser. Paste a Base64 string and SnapTools returns the original text as you type, with standard and URL-safe variants so the characters map back correctly. Nothing is uploaded; decoding runs locally, so it's safe for private payloads and tokens.

Base64 shows up everywhere data needs to travel as plain text — data URIs, API fields, auth headers, and config values. Because it's an encoding rather than encryption, decoding it simply reverses the transform and gives you the readable content back; it never proves anything was secure.

// how to use

1 Paste your Base64 string into the input panel on the left.
2 Choose the matching variant — standard or URL-safe — in the options.
3 Read the decoded text in the output panel on the right.
4 Use Copy or Download to save the decoded result.

// examples

Decode a standard string

Input

SGVsbG8=

Output

Hello

Decode URL-safe Base64

Input

c3ViamVjdHM_aWRzPTEmcGFnZT0y

Output

subjects?ids=1&page=2

// common uses

Reading values from data URIs Inspecting Base64 fields in API payloads Recovering encoded config or token values Decoding Basic Auth header contents

// faq

No. Decoding happens entirely in your browser, so nothing is uploaded and your input stays on your machine.

Base64 is encoding, not encryption, so it provides no security — anyone can decode it. If a value was only Base64-encoded, decoding it exposes the original text, which is why secrets should never be stored that way.

URL-safe Base64 uses "-" and "_" in place of "+" and "/". Pick the variant that matches how the string was encoded so the characters map back correctly.

The input may be the wrong variant, have missing padding, or not be Base64 at all. Check that you've selected standard versus URL-safe correctly and that the whole string was copied.

Use the Base64 Encoder, which turns plain text into a Base64 string in standard, URL-safe, or MIME format.

// related

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Use this via API

Get a free API key →

curl -X POST https://snaptools.dev/api/v1/tools/base64-decode \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text":"SGVsbG8="}'