🔐 Free Online Tool

Base64 Encoder & Decoder Free Online

The ultimate free online Base64 encoder and decoder — encode text, decode Base64 to text, URL-safe Base64, file to Base64 converter, image to Base64 converter, validator & Hex tool. Fast, secure, 100% browser-based.

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Instant Processing

Real-time encoding and decoding — no server, no upload

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URL Safe Base64 Encode

RFC 4648 §5 compliant — perfect for JWTs, URLs & APIs

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File to Base64 Converter

Convert any file type to Base64 with drag & drop

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100% Private

Your data never leaves your browser — nothing uploaded

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Image to Base64 Converter

Convert PNG, JPG, GIF, WebP images to Base64 or Data URL

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Base64 to Text Online

Instantly decode any Base64 string back to readable text

URL-Safe Mode Line Breaks (76 chars) No Padding (=)

📝 Plain Text Input

0 chars

🔐 Base64 Output

0 chars

Input: –

Output: –

Size Increase: –

Mode: Standard

Encoding: UTF-8

Auto-fix Padding URL-Safe Input

🔐 Base64 Input

0 chars

📝 Decoded Output

0 chars

Use this tool to URL safe Base64 encode your text. Standard Base64 uses + and / which have special meaning in URLs. URL-Safe Base64 (RFC 4648 §5) replaces + with - and / with _, removing padding — making it safe for JWT tokens, URL parameters and filenames.

📝 Input Text

🔗 URL-Safe Base64 Output

⟵ Standard ↔ URL-Safe Converter ⟶

Standard Base64

URL-Safe Base64

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Drop file here or click to browse

File to Base64 Converter — all file types supported • Max 10MB

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–

📤 Base64 Output

0 chars

Data URL Format (data:...;base64,...) URL-Safe Mode

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Drop image here or click to browse

Image to Base64 Converter — PNG, JPG, GIF, WebP, SVG • Max 5MB

📤 Base64 Output

0 chars

Data URL (img src compatible) CSS background-image format

Base64 → Image Preview

Paste Base64 or Data URL to preview

Paste any Base64 string below — this tool instantly checks whether it is valid or invalid, detects the type (Standard or URL-Safe), and shows full padding & length analysis.

🔍 Base64 String to Validate

0 chars

✓ Valid Base64

Hex ↔ Base64 Converter: Convert hexadecimal strings to Base64 and Base64 back to hex. Useful for developers working with cryptographic data, binary protocols, and network packets.
Example hex: 48656c6c6f → Base64: SGVsbG8=

🔢 Hexadecimal Input

🔐 Base64 Output

Reverse: Base64 → Hex

🔐 Base64 Input

🔢 Hex Output

Ignore spaces in hex input Uppercase Hex output

Frequently Asked Questions

Base64 is an encoding scheme that converts binary data into ASCII text format. It uses 64 printable characters (A–Z, a–z, 0–9, +, /). It is widely used to safely transmit binary data in emails, APIs, and web pages. Important: Base64 is not encryption — it is only encoding. Anyone can decode a Base64 string.

Standard Base64 contains + and / characters which have special meaning in URLs. URL-Safe Base64 (RFC 4648 §5) replaces + with - and / with _, and removes padding (=). Use URL-safe Base64 encode for JWT tokens, URL query parameters, and filenames to avoid encoding issues.

Base64 encoding increases data size by approximately 33–37%. This happens because every 3 bytes are represented by 4 ASCII characters (3×8 = 24 bits → 4 characters). Adding line breaks (76 chars) increases the size slightly more. Our tool shows the real-time "Size Increase" stat in the stats bar after encoding.

This tool is completely secure. It runs 100% client-side inside your browser. None of your data — not passwords, not files, not images — is sent to any server. All processing happens on your device only. You can even use it offline after the page has loaded.

Common uses of the image to Base64 converter: (1) Embed images inline in HTML/CSS — no separate file request needed, (2) Embed images in email templates, (3) Send image data in JSON/XML API responses, (4) Build offline-capable web apps. The format used is: <img src="data:image/png;base64,...">. Our tool also generates the CSS background-image format.

If Base64 is not decoding, check the following: (1) Enable Auto-fix Padding — the padding (=) characters may be missing. (2) Enable URL-Safe Input — if the string contains - and _ instead of + and /. (3) Remove any extra spaces or newlines from the string. (4) Use the Validate tab first — it will show you the exact problem.

Hex (hexadecimal) uses 16 characters (0–9, A–F) — each byte is represented by 2 hex characters, so the size doubles. Base64 uses 64 characters — every 3 bytes become 4 characters, so size increases by ~33%. Base64 is more compact and preferred for data transfer. Hex is used for debugging and binary inspection. Use our Hex ↔ Base64 tab to convert between them instantly.

UTF-8 is the recommended encoding — it supports all languages (Arabic, Chinese, emoji, and all Unicode characters). Most modern APIs use UTF-8. Latin-1 (ISO-8859-1) only supports Western European characters but is used by many legacy systems. If you are encoding text with special characters or non-Latin scripts, always use UTF-8.

JWT (JSON Web Tokens) use Base64URL encoding which is another name for URL-Safe Base64: + → -, / → _, and padding (=) is removed. The header, payload, and signature of a JWT are all Base64URL encoded. You can use our URL-Safe tab to decode individual parts of a JWT token.

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