Hinglish captions in Latin script, romanized from real Devanagari.

What Hinglish captions actually are

Hinglish is Hindi and English mixed inside a single sentence, which is how a very large number of Indian creators genuinely speak. "Toh basically mera point ye hai ki consistency matters." There is no clean boundary to split on — English nouns take Hindi grammar, Hindi verbs carry English objects, and the switch can happen twice in one clause.

Hinglish captions write that mixture in Latin script rather than Devanagari. "Toh basically mera point ye hai" instead of "तो basically मेरा point ये है". This is not a compromise or a shortcut — it is how Hinglish is written in practice, in chats, comments and captions across India, and it is what a lot of viewers read fastest.

The alternative, mixed-script captions, forces a reader to switch alphabets mid-line. Some audiences handle that fine. For short-form video read in under two seconds on a phone, one script is usually easier.

Why transcribe to Devanagari first

There are two ways to produce romanized Hindi, and the difference in quality is large.

The naive way is to have the speech model write Latin characters directly from the audio. It sounds simpler and it is noticeably worse, because the model is doing two uncertain things at once: working out which word was spoken, and inventing a spelling for it with no agreed standard to anchor to. Errors in each step compound, and you get spellings that drift from line to line — the same word written three ways in one video.

CaptionFX does it in two steps instead. Hindi speech is recognised as Devanagari, where the model is working in the script the language is actually written in and has real orthographic ground truth to aim at. That Devanagari is then transliterated to Latin script by a deterministic mapping.

The payoff is consistency. Because romanization is a rule applied to recognised text rather than a guess from sound, the same Hindi word romanizes the same way every time it appears. Fix a spelling once and it is not wrong differently three captions later.

What you should expect

This is the hardest case in captioning and it would be dishonest to pretend otherwise. Clean English audio is around 95% of words correct. Clean Hindi is roughly 85-90%. Code-mixed Hinglish is below both, because the model has to decide — word by word, often mid-phrase — which language it is hearing before it can decide how to write it.

So treat the output as a draft that saves you the typing, not as finished text. In practice that is a two-to-five minute review on a short clip, and the errors are predictable enough to work through fast: check the English technical words sitting inside Hindi sentences first, since that is exactly where the language decision goes wrong, then names and brands, then numbers.

If a captioning tool advertises clean Hinglish output with no review step, it is not being measured on real code-mixed audio. The useful question is not whether a tool gets Hinglish perfect — none do — but how quickly it lets you fix what it got wrong.

Why the review tools matter more here

Because Hinglish needs a review pass, the speed of that pass is the whole product experience. A tool that gives you 90% accuracy with a fast editor beats one claiming 93% behind a transcript box in a separate window.

CaptionFX puts the captions over the playing video, so you read a line while hearing the audio under it and fix it where it sits. For Hinglish specifically that matters more than for a single-language clip, because judging whether a word should have been written in Hindi or English often needs the surrounding sentence and the speaker's delivery, not just the word.

Word-level editing does the rest of the work. A single wrongly-romanized word is one correction, not a retyped line. And if the clip has a stumble or a filler word, you can cut that word from the audio and video entirely — Hinglish speech tends to have more false starts than scripted English, so this comes up constantly.