Base64 Encoder Online Free — Text to Base64

Base64 Encoder — encode text to Base64 error runs in your browser · nothing uploaded

⌃⏎ run · ⎋ clear · / focus input

TEXT ⇅ upload

⇅ drop a file to load it

BASE64

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 Encoder Online

Updated 2026-07-09

Encode text to Base64 online, instantly and privately in your browser. Paste any string and SnapTools returns the Base64 result as you type, with standard, URL-safe, and MIME-wrapped variants to match wherever the output needs to go. Nothing is uploaded; the encoding runs locally, so it's safe for private data.

Base64 turns arbitrary text or binary data into an ASCII string that survives transport through systems that expect plain text — data URIs, JSON fields, email headers, and HTTP auth headers. Remember that it's an encoding, not encryption: anyone can decode the result, so it secures nothing.

// how to use

1 Paste or type your text into the input panel on the left.
2 Pick an output variant — standard, URL-safe, or MIME-wrapped — in the options.
3 Read the Base64 result in the output panel on the right.
4 Use Copy or Download to take the encoded output with you.

// examples

Encode a short string

Input

Hello

Output

SGVsbG8=

URL-safe encoding

Input

subjects?ids=1&page=2

Output

c3ViamVjdHM_aWRzPTEmcGFnZT0y

// common uses

Embedding images or files in data URIs Encoding binary data for JSON or XML Building Basic Auth headers Passing values safely inside URLs

// faq

No. Encoding happens entirely in your browser, so nothing is uploaded and your input never leaves your machine.

No. Base64 is a reversible encoding, not encryption — it provides no security at all. Anyone can decode it back to the original text, so never use it to protect secrets.

Standard Base64 uses "+" and "/", which have special meaning in URLs. URL-safe replaces them with "-" and "_" so the output can be dropped into a query string or path without escaping.

MIME-wrapped output breaks the Base64 into 76-character lines, the format expected by email headers and some legacy systems. Leave it off for compact, single-line output.

Use the Base64 Decoder, which reverses this process and returns the original text from a Base64 string.

↳ Curious to go deeper? Read the What is Base64 encoding (and when to use it) guide →

// related

Base64 Decoder URL Encoder JWT Decoder Sort & Dedupe Lines Slug Generator

Use this via API

Get a free API key →

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