Set the output
For the documented free tier, use a target below 20 MB rather than exactly 20 MB, then verify the result before attaching it.
VIDEO FOR DISCORD
Discord currently documents 20 MB for non-Nitro users, 50 MB for Nitro Basic and up to 500 MB for Nitro, while noting that limits may be experimental.
Quick answer
Choose the limit shown in your own Discord client and target slightly below it. Lower resolution or remove unnecessary audio if the estimate remains too high.
Select the video from your computer. The extension reads only the file you choose.
Choose the size, quality and resolution that matches the destination.
Preview the result, compare its measured size and save the new copy only after it passes verification.
Discord checks file size before upload. A local compressed copy can fit the applicable tier without sending the original to another compression service.
Processing runs locally in Chrome. Video bytes, frames, thumbnails, filenames and paths are not uploaded for conversion.
For the documented free tier, use a target below 20 MB rather than exactly 20 MB, then verify the result before attaching it.
Preview the result, compare its measured size and save the new copy only after it passes verification.
Use the limit displayed in Discord and leave a small margin below it; the current documentation states 20 MB for non-Nitro users.
No. The selected video is processed locally in Chrome.
No. The extension creates a separate output and leaves the original untouched.
Use the limit displayed in Discord, compress locally and check the actual output.