FileFryer
Developer-Grade Base64 Conversion Suite
Encode, decode, inspect, and embed files and text strings with zero hassle.
Bidirectional Encoding & Decoding
Instantly encode UTF-8 plain text, code, emojis, and JSON into standard or URL-safe Base64, or decode Base64 back into human-readable text.
File to Base64 & Data URI Generator
Convert images, PDFs, audio clips, fonts, and SVGs into Base64 Data URIs ready for inline HTML <img> tags, CSS background-image rules, or Markdown.
Reverse Base64 to Binary Download
Paste any raw Base64 string or Data URI to reconstruct the original binary file and download it with auto-detected file extensions.
100% Client-Side Browser Execution
No data, strings, or file buffers are transmitted over the internet. Everything executes locally in your browser's private V8 JavaScript sandbox.
Full UTF-8 & International Character Support
Powered by native TextEncoder and TextDecoder APIs, ensuring error-free handling of multi-byte characters, accents, non-Latin alphabets, and emojis.
URL-Safe & Padding Trimming Controls
Easily strip trailing equals signs (=) or swap standard symbols (+ and /) with URL-safe variants (- and _) for query parameter usage.
How to Use the Base64 Converter in 3 Steps
Fast, accurate data encoding and binary reconstruction.
Choose Text or File Mode
Select "Text / String Mode" for rapid text transformations or "File & Data URI Mode" for embedding media, fonts, and binary documents.
Configure Parameters
Toggle URL-safe encoding (`-` and `_`), padding trimming (`=`), or choose your target snippet format (Data URI, HTML <img>, CSS, or Markdown).
Copy Snippet or Download
One-click copy your Base64 output to your clipboard, save it as a text file, or reconstruct binary files from Base64 inputs.
Zero Server Transfer Guarantee
Your API tokens, configuration secrets, text snippets, and uploaded files are processed strictly inside your local browser memory. Zero cloud storage, zero transmission.
Frequently Asked Questions
Everything you need to know about Base64 encoding, Data URIs, and browser safety.
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that translates arbitrary byte sequences into an ASCII string format composed of 64 characters (A-Z, a-z, 0-9, +, /). It allows binary media (such as images and audio) to be safely transferred over text-only protocols like HTML, CSS, JSON, and email.
Does Base64 encoding increase file size?
Yes. Base64 encoding expands data size by approximately 33% (4 bytes of text for every 3 bytes of binary data). For small icons, avatars, and inline stylesheets, this overhead is often negligible compared to the latency savings of eliminating extra HTTP requests.
Does this tool support Unicode and emojis?
Yes! Unlike legacy JavaScript btoa() and atob() functions which throw errors on characters with code points above Latin1, FileFryer uses modern TextEncoder and TextDecoder APIs to ensure 100% accurate UTF-8 encoding and decoding for international characters and emojis.
What is URL-Safe Base64?
Standard Base64 uses '+' and '/', which have special meanings in URLs and filename paths. URL-safe Base64 replaces '+' with '-' and '/' with '_', making the string safe to pass in query parameters and REST API routes without URL-encoding.
Are my files uploaded to your servers?
Never. All encoding, decoding, file reading, and data reconstruction happens completely client-side in your own web browser. FileFryer has zero server-side storage or tracking.
How do I embed a Base64 image directly in HTML or CSS?
In File Mode, select HTML or CSS Background from the snippet format selector. Copy the pre-formatted snippet and paste it directly into your HTML document or stylesheet without needing external image hosting.