Convert Files in Your Browser Without Uploading Them

Why "No Upload" Matters

When you use a traditional online file converter, your file travels to a server, gets processed, and is returned to you. That means:

• Your file (a contract, photo, video) is on someone else's server
• It may be stored, logged, or processed further
• The conversion speed depends on their server load and your internet connection
• If the service goes down or disappears, you can't convert

How Browser Conversion Works

Modern browsers ship with powerful APIs that make local file processing possible:

• Canvas API — renders and converts images (PNG, JPG, WebP, GIF, BMP)
• FFmpeg.wasm — a WebAssembly port of FFmpeg that runs video conversion directly in the browser
• File API — reads files from your device without uploading them
• Blob API — creates downloadable output files

What You Can Convert

• PNG → JPG, WebP, PDF
• JPG → PNG, WebP, PDF
• WebP → JPG, PNG
• GIF → PNG, JPG

• MP4 → WebM, GIF, MOV
• MOV → MP4, WebM
• AVI → MP4, WebM
• WebM → MP4

Performance

Video conversion in the browser is CPU-intensive. For large files (over 500MB), a native desktop app will generally be faster. For images and short video clips, browser conversion is instant to a few seconds and is meaningfully more private.

When to Use Browser Conversion vs. Desktop Apps

For most day-to-day conversions, a browser-based tool is the right choice — no installation, no upload, instant results.