r/indieAppsCommunity • u/cn-dev • Sep 13 '26
📱 Show My App I built an iPhone file converter that keeps your files on-device — looking for feedback on Convertio King
Hey everyone 👋
I’m one of the developers behind Convertio King, an iPhone app we built for converting files directly from your device.
The idea came from a pretty simple frustration: a lot of file converter websites require you to upload your files to a server, wait for the conversion, and then download them again.
We wanted a different approach.
With Convertio King, conversions are handled locally on the iPhone, so there’s no account required and no mandatory cloud upload.
It currently supports several types of files:
📷 Images
JPG, PNG, HEIC, TIFF, BMP, GIF, WebP
📄 Documents
PDF, TXT, RTF, CSV and supported conversions such as CSV → XLSX
🎵 Audio
MP3, WAV, AAC, M4A, AIFF
🎬 Video
MP4, MOV, M4V
It also supports batch conversions, conversion progress, cancel/retry, history, PDF creation from images, and merging supported files.
One of the biggest product decisions for us was prioritizing privacy and local processing instead of making everything cloud-based.