Why are broadcast TV subtitles and closed captions in ALL CAPS?

Legacy television broadcast standards like EIA-608 and CEA-708 used fixed-grid, low-resolution character generators where uppercase letters were much more legible on cathode-ray tube (CRT) screens. Many broadcast captioners still deliver files in all-caps today.

Will converting the text case mess up my timecodes or cue numbers?

No. SubPreflight only transforms the dialogue text of each cue. Timecode lines, arrow separators (-->), millisecond values, and sequential cue numbers are preserved with 100% accuracy.

Does this tool preserve HTML formatting tags like and ?

Yes. The case converter isolates formatting tags during processing, so tags like , , and remain lowercase and structurally valid.

Does Sentence Case capitalize the word "I"?

Yes. The sentence-case engine automatically capitalizes standalone "I" and contractions like "I'm", "I'll", "I'd", and "I've".

.SRT.VTT

Subtitle Case Converter & ALL CAPS Fixer

Convert broadcast ALL CAPS closed captions to clean Sentence case, Title Case, or lowercase without altering subtitle timecodes or HTML formatting tags.

100% In-Browser · Zero Upload

Zero latency · Client-side Web Worker

Select Target Case Style

Sentence case Capitalizes the first letter of each sentence and standalone "I". Recommended for fixing ALL CAPS captions. Hello world. This is a sentence.

Title Case Capitalizes the first letter of major words while keeping minor words (in, the, of) lowercase. Hello World. This Is a Sentence.

lowercase Converts all dialogue characters to lowercase. hello world. this is a sentence.

UPPERCASE Converts all dialogue characters to capital letters for legacy broadcast requirements. HELLO WORLD. THIS IS A SENTENCE.

Drop your SRT or WebVTT file to transform text case

Case conversion preserves timestamps and HTML tags safely

Why Convert Subtitle Case?

Closed captions exported from television broadcasts, government archives, or automated transcription engines often arrive in ALL CAPS. When published on YouTube, Vimeo, or social video feeds, all-caps subtitles feel aggressive, crowd the video screen, and reduce viewer reading comprehension.

Before (All Caps Broadcast)

1
00:00:01,000 --> 00:00:04,500
HELLO EVERYONE AND WELCOME TO THE SHOW.
TODAY I'M JOINED BY OUR SPECIAL GUEST.

After (Clean Sentence Case)

1
00:00:01,000 --> 00:00:04,500
Hello everyone and welcome to the show.
Today I'm joined by our special guest.

Smart Sentence-Case Rules Applied

Sentence Capitalization: Capitalizes the start of each cue and any word following sentence-ending punctuation (., !, ?).
English "I" Pronoun Protection: Detects and capitalizes standalone "I" and contractions like "I'm", "I'll", and "I've".
HTML Tag Preservation: Skips formatting tags like , , and , preventing broken tags.
Zero Timecode Drift: Timestamps, cue markers, and sequence numbers remain completely unmodified.

Frequently Asked Questions

Why are broadcast TV subtitles and closed captions in ALL CAPS?: Legacy television broadcast standards like EIA-608 and CEA-708 used fixed-grid, low-resolution character generators where uppercase letters were much more legible on cathode-ray tube (CRT) screens. Many broadcast captioners still deliver files in all-caps today.
Will converting the text case mess up my timecodes or cue numbers?: No. SubPreflight only transforms the dialogue text of each cue. Timecode lines, arrow separators (-->), millisecond values, and sequential cue numbers are preserved with 100% accuracy.
Does this tool preserve HTML formatting tags like and ?: Yes. The case converter isolates formatting tags during processing, so tags like , , and remain lowercase and structurally valid.
Does Sentence Case capitalize the word "I"?: Yes. The sentence-case engine automatically capitalizes standalone "I" and contractions like "I'm", "I'll", "I'd", and "I've".