Convertio is an online converter supporting a huge range of file formats, from images and video to documents and e-books. Files are uploaded and converted on their servers.
Toolkoa focuses on the most common image, video and audio conversions and does them inside your browser. No sign-up, no watermark and your files never pass through someone else's server.
Real limits: the format catalogue is much smaller than Convertio's and there's no document or e-book conversion. Very long videos may convert slowly, since it uses your device's power.
| Feature | Toolkoa | Convertio |
|---|---|---|
| Where files are converted | In your browser, never uploaded | On their servers |
| Number of formats | The most common ones | Very wide |
| Documents and e-books | No | Yes |
| Account required | No | Check their website |
| Private files without sending them | Yes | Requires uploading |
Yes. The conversion uses the browser's canvas and the image never leaves your device.
Yes, with MP4 to MP3 or the audio converter, which run FFmpeg in the browser.
You need a connection to open the page and download the engines the first time; the file itself is processed locally.