Codificador / Decodificador Base64 — Herramienta online gratis
Codifica o decodifica Base64 al instante
Codifica o decodifica cadenas Base64 al instante. Gratis, en tu navegador, compatible con UTF-8. No sale de tu dispositivo.
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Free Base64 encoder & decoder — UTF-8 safe, browser-based
Herramientaolis Base64 Encoder/Decoder converts between plain text and Base64 entirely in your browser. Full UTF-8 support means emojis, accented letters, and non-Latin scripts encode and decode correctly. No server round-trips, no logging — your data stays on your device.
What Base64 is used for
- Email attachments — Binary files embedded in plain-text email (MIME)
- Data URLs — Inlining images directly into CSS or HTML (
data:image/png;base64,…) - JWT tokens — The three parts of a JWT are Base64-URL-encoded JSON
- Basic authentication — HTTP headers like
Authorization: Basic <base64(user:pass)> - API keys in URLs — When a key contains special characters
- Storing binary in JSON — Since JSON can\'t hold raw bytes
How to use this tool
- 1
Choose a direction
Toggle between Encode (plain text → Base64) and Decode (Base64 → plain text).
- 2
Paste your input
Type or paste text. UTF-8 is fully supported — emojis, accented letters, Asian scripts all work. The tool detects invalid Base64 and shows a clear error.
- 3
Copy the result
Output updates live. Click Copy to send it to your clipboard, ready to drop into an API request, email, or config file.
Base64 is NOT encryption
Base64 is reversible by anyone in under a second. It is encoding, not encryption. Never use Base64 to protect passwords, API keys, or private data. For privacy, use real encryption like AES-256 (try our coming-soon AES Encrypt tool) and pair with a secure key exchange.
Output size
Base64 encoding grows your data by approximately 33%. A 100-byte input produces a ~136-byte Base64 string. This is the trade-off for transporting binary data through text-only channels.
Frequently Asked Questions
What is Base64 encoding?
A-Z, a-z, 0-9, +, /, and = for padding. It's used when you need to transport binary data through text-only channels like email, JSON, or URLs.Is Base64 encryption?
How does Base64 handle UTF-8?
TextEncoder / TextDecoder to handle UTF-8 correctly. Non-ASCII characters (é, ü, 中, 🎉) are converted to their UTF-8 byte sequences before encoding, and restored properly on decode.Why does my Base64 end with = or ==?
= characters are padding. Base64 groups input into chunks of 3 bytes → 4 characters. If your input isn't a multiple of 3 bytes, padding fills the gap. One trailing = means the input was 2 bytes short; two means 1 byte short.What's URL-safe Base64?
+ and / which have special meaning in URLs. URL-safe Base64 replaces them with - and _, and sometimes omits padding. This tool uses standard Base64. For URL-safe, manually replace +→-, /→_.Can I encode images or files?
Is my input private?
btoa, atob, and the TextEncoder API. No data leaves your device. Safe for API keys, tokens, and sensitive payloads.Puntos clave
- Base64 Encoder / Decoder is a free, browser-based developer tool — encode or decode base64 instantly.
- No signup, no downloads, no file uploads — your data stays on your device.
- Works on desktop, tablet, and mobile. Install as a PWA for offline access.
How to Use Base64 Encoder / Decoder
- Open the tool: Launch Base64 Encoder / Decoder on Herramientaolis — no account or download needed.
- Enter your data: Paste text, enter values, or select a file directly in your browser.
- Get instant results: Everything is processed locally — results appear immediately.
- Copy or download: Save your output or share it. Bookmark for quick access next time.
Base64 Encoder / Decoder — Quick Facts
- Precio
- Gratis — sin límites, sin marcas de agua, sin paywall
- Privacidad
- 100% en el navegador — ningún dato sale de tu dispositivo
- Plataforma
- Cualquier navegador moderno — escritorio, tablet o móvil
- Categoría
- Desarrollador Herramientas on Herramientaolis
- Sin conexión
- Works offline after first visit (Progressive Web App)
| Característica | Detalles |
|---|---|
| Herramienta | Base64 Encoder / Decoder |
| Categoría | Desarrollador |
| Requiere registro | No |
| Subida de archivo | Ninguno — procesado en el navegador |
| Compatible con móvil | Totalmente adaptable |
| Coste | Gratis para siempre |
Why Use Base64 Encoder / Decoder?
You should try Base64 Encoder / Decoder for a quick, private way to encode or decode base64 instantly. All processing happens in your browser. Your files and data never leave your device. According to web.dev, client-side processing is the gold standard for privacy.
On the other hand, dedicated APIs or desktop tools suit batch processing better. They also handle server-side automation. For everyday tasks, browser tools offer the best speed, privacy, and convenience.