Portuguese subtitle generator
Portuguese is among the languages the speech model handles best: 7.3% of words wrong for the Accurate model in OpenAI’s figures. Write the subtitles without uploading the video.
Drop your video here
Choose your videoMP4, MOV, WebM or MKV. It opens right here, on your device.
- Nothing uploaded
- No sign-up
- No watermark
How often it gets a Portuguese word wrong
| Model in Shycut | Word error rate | Roughly | From the paper |
|---|---|---|---|
| Accurate (Whisper small) | 7.3% | 1 word in 14 | Table 13, “Whisper small” row, Portuguese column · OpenAI |
| Fast (Whisper base) | 13% | 1 word in 8 | Table 13, “Whisper base” row, Portuguese column · OpenAI |
Word error rate is the share of words a model gets wrong (swapped, missed or added) against a human transcript, in OpenAI’s own test on the FLEURS speech set; lower is better.
Shycut runs these two models converted to work in a browser (with 8-bit or 4-bit weights on some devices), so its results can differ a little from the paper’s.
Which model to pick
- Accurate
- Makes 44% fewer mistakes in Portuguese than Fast. A one-time download of about 300 MB, kept on your device.
- Fast
- About 100 MB to download and quicker to run, at about 1 word in 8 wrong instead of 1 in 14.
- Either way
- Correct any line in the Captions tab before saving; the speech never leaves your device.
Strong in Portuguese, both ways
Portuguese comes third of 10 for accuracy. It is also the language the model translates into English best of all those Shycut offers, so the same video can carry Portuguese or English captions.
The Fast model gets 13% of words wrong, about 1 in 8; Accurate cuts that by 44%. For a clip you will post, the larger download pays for itself in fewer corrections.
Need English captions for Portuguese speech? Translate it instead.
How to do it in Shycut
Open your video
The button opens Shycut with the captions set to Portuguese, ready to write.
Write the captions
The speech model downloads once, then turns the speech into timed lines in this browser tab.
Check, then save
Fix names and terms, pick a caption style, and save the video with the captions in it, or download them as an SRT file.
Where these facts come from
Questions
How accurate is it for Portuguese?
OpenAI reports 7.3% of words wrong for Whisper small, the Accurate model in Shycut, and 13% for base, the Fast one.
Can the subtitles be translated into English?
Yes. Portuguese is the best-translated language Shycut offers; see the Portuguese translation page.
Where is the video processed?
In your browser, on your device. Nothing is uploaded.
Your video stays with you.
Open Shycut, drop the video in and export. Free, with no account, and your video never leaves your device.
Choose your video