I built a free offline all-in-one file converter for Windows. Documents, images, audio & video, no uploads, no account

Hyacinthe — Sun, 05 Apr 2026 00:19:49 +0000

Hey everyone,

I've been working on File Converter Pro, a free desktop app for Windows that handles document, image, audio, and video conversions, all locally, without sending your files anywhere.

Why I built it
I was tired of either uploading sensitive files to online converters or juggling 4 different tools for different formats. I wanted one clean tool that works on a clean machine with zero setup.

What it does

Converts documents (PDF, DOCX, XLSX, PPTX, HTML, EPUB...), images (JPEG, PNG, WebP, HEIC, ICO...), audio (MP3, WAV, FLAC...) and video (MP4, MKV, MOV...)
Batch conversions
Multi-engine fallback if one engine fails, it tries the next automatically
100% offline, no telemetry, no account

Some extras I'm proud of

Auto dark/light mode from the Windows registry
Statistics dashboard with animated charts
Achievements & rank system backed by SQLite
Project files (.fcproj) to save and reopen conversion setups
Drag files directly onto the .exe to pre-load them
Encrypted settings storage

It's open source and completely free.

Here is where you can find it or if you want to learn more:

GitHub
Itch.io

I will be glad to hear your thoughts on it.
Thanks

DEV Community: Hyacinthe

I built a free offline all-in-one file converter for Windows. Documents, images, audio & video, no uploads, no account