About OnlineConvert
A privacy-first image converter
What we do
OnlineConvert is a free image conversion tool that runs entirely in your browser. Convert between JPG, PNG, WebP, and other formats without uploading your files anywhere. Your images stay on your device, always.
How it works
Unlike most online converters that upload your files to a server, OnlineConvert uses modern browser APIs to process images directly on your device. This means:
- → Faster conversions — No upload/download wait times
- → Complete privacy — Your files never leave your device
- → Works offline — Once loaded, no internet needed
- → No limits — Process as many files as your device can handle
Why we built this
Most image converters require you to upload your files to unknown servers. You don't know what happens to your photos, how long they're stored, or who might access them.
We believe simple tools shouldn't require you to trust strangers with your data. Modern browsers are powerful enough to handle image conversion locally, so that's exactly what we do.
Features
Format conversion
JPG, PNG, WebP, and more. Convert single files or entire batches.
Quality control
Adjust compression quality to balance file size and image quality.
Smart defaults
Auto background color for transparency, correct EXIF orientation.
Batch processing
Drop multiple files at once. Download individually or as a ZIP.
Our values
Privacy first
We don't collect, store, or access your files. Period.
No dark patterns
No forced signups, no hidden fees, no fake "processing" delays.
Transparent limits
We tell you exactly what the tool can and can't do.
Free to use
Supported by non-intrusive ads. No premium tiers or paywalls.
Technical details
For the curious, OnlineConvert uses:
- • Canvas API for image encoding/decoding
- • File API for reading local files
- • Blob/URL API for generating downloads
- • fflate for ZIP compression
- • Astro for the website framework