Base64 File Converter - Encode and Decode Files Online
Convert files to Base64 strings or decode Base64 data into files instantly. Secure, browser-based Base64 file converter. Free with no upload limits.
About Base64 File Converter
The Base64 File Converter allows you to encode any local file into a Base64 string or decode existing Base64 text back into its original binary format. It supports all common file types, including images, PDFs, audio tracks, spreadsheets, and compiled binaries.
Because processing happens directly inside your web browser, your files are never transmitted to an external server. This tool provides web developers, API engineers, and data analysts with a secure, private, and instant conversion workflow without requiring any software installation.
Key features
- Two-way conversion between binary files and Base64 strings
- Client-side processing keeps your files completely private
- Supports all file types including images, documents, and archives
- Generates ready-to-use Data URI strings for web development
- One-click copying for long Base64 strings
- Direct file download for decoded binary outputs
How to use Base64 File Converter
- Select whether you want to encode a file or decode a Base64 string.
- Upload your file via drag-and-drop or paste your Base64 text into the input box.
- Choose your output options, such as formatting as a Data URI if needed.
- Copy the generated Base64 string or download the decoded file to your device.
Who is it for?
- Web developers embedding inline images and SVGs directly into HTML or CSS
- API developers testing JSON payloads that require Base64-encoded file attachments
- Software engineers reconstructing binary assets from serialized raw strings or log files
- Email template designers embedding lightweight graphical assets directly into email markup
Frequently asked questions
What is a Base64 file converter?
A Base64 file converter is a utility that translates binary files into an ASCII text representation using 64 printable characters, and vice versa.
Are my files uploaded to your servers during conversion?
No. The conversion runs entirely within your browser using JavaScript, meaning your files never leave your computer.
Does converting a file to Base64 increase its file size?
Yes. Encoding binary data to Base64 typically increases the total size by approximately 33% due to the translation into 6-bit chunks.
What file formats can I encode with this tool?
You can encode any file format, including PNG, JPEG, PDF, ZIP, MP3, and TXT, as Base64 handles arbitrary binary data.
Is the Base64 File Converter free to use?
Yes. The tool is completely free to use with no account creation or subscription required.