Base64 Encoder & Decoder Online – Convert Text, Files, Images, and More

Base64 encode or decode text and files online. Supports images, documents, audio, and video formats like PNG, JPG, WEBP, PDF, DOCX, MP3, and MP4. Fast, secure, browser-based tool.

Encoding Decoding

Images

PNG, JPG, JPEG, GIF, WEBP, AVIF, BMP

Images - Encoding

Enter text or attach a file to encode

Images -> Base64

Images - Decoding

Enter a Base64 string to decode

Base64 -> Images

All formats

Documents

PDF, DOCX, XLSX, TXT, CSV, XML, JSON

Documents - Encoding

Enter text or attach a file to encode

Documents -> Base64

Documents - Decoding

Enter a Base64 string to decode

Base64 -> Documents

All formats

Audio

MP3, WAV, OGG, M4A, FLAC

Audio - Encoding

Enter text or attach a file to encode

Audio -> Base64

Audio - Decoding

Enter a Base64 string to decode

Base64 -> Audio

All formats

Video

MP4, WEBM, MOV, AVI, MKV

Video - Encoding

Enter text or attach a file to encode

Video -> Base64

Video - Decoding

Enter a Base64 string to decode

Base64 -> Video

All formats

All formats Base64

Base64 guides and deep dives

Open all guides

PNG to Base64 in JavaScript

Browser workflow with FileReader, validation, and performance notes.

Base64 Data URL Guide

Structure, practical examples, and common limits.

Fix InvalidCharacterError in Base64

Normalize payload, restore padding, and decode safely.

Base64URL vs Base64

Alphabet differences, padding rules, and conversion examples.

Base64 File Size Overhead

How to estimate the 33% size increase and avoid payload bloat.

Convert PDF to Base64 in Browser

Client-only PDF conversion flow with file validation.