Subtitle Case Converter

The Subtitle Case Converter rewrites every cue in a SubRip file to one consistent case style. Paste the file into the SRT Content box, choose UPPERCASE, lowercase, Title Case or Sentence case from the Case dropdown, and the tool returns a full SRT - saveable as an .srt file - with identical numbering and timecodes but uniformly cased dialogue.

Mixed casing marks a file that has passed through several hands: a transcript typed in capitals, a machine translation that lower-cased proper nouns, cues merged from two suppliers. Burn-in workflows sometimes require ALL-CAPS for legibility over picture, while streaming platforms and accessibility guidance prefer sentence case because mixed-case text reads measurably faster.

Each mode is precisely defined. Upper and lower apply a straight case fold. Title Case capitalises the first letter of every word at each word boundary, so short words like of and the are capitalised too. Sentence case lower-cases the text, then capitalises the opening letter and the first letter after a full stop, question mark or exclamation mark, so a cue holding two sentences comes out right. Line breaks and timings are untouched.

Conversion is computed locally in the browser, so no subtitle file is uploaded and long tracks convert instantly.

• Four modes in the Case dropdown: UPPERCASE, lowercase, Title Case and Sentence case cover the conventions used by broadcast, streaming and burn-in workflows.
• Sentence case that follows punctuation: The sentence mode re-capitalises after a full stop, question mark or exclamation mark, so a cue holding two sentences comes out correct rather than capitalised only at the front.
• Whole-file consistency: Every cue in the pasted SRT Content is converted in the same pass, which removes the mixed-style problem in one action.
• Timings and numbering untouched: Only the text of each cue changes; start and end timecodes and cue order are written back exactly as parsed.
• Multi-line cues handled: Line breaks inside a caption are preserved, so a carefully balanced two-line cue keeps its shape after conversion.
• Predictable Title Case: Title mode capitalises the first character of every word by rule, which is ideal for song titles and stylised cards where uniformity matters more than editorial exceptions.
• Reversible in practice: Because the tool is non-destructive to timing, you can convert to lowercase and then to Sentence case to normalise a shouted ALL-CAPS transcript.
• No upload: Conversion runs entirely in your browser, so client scripts and unreleased dialogue stay on your machine.

1. Click Load sample if you want a demonstration file in the SRT Content box before working on your own subtitles.
2. Paste the subtitle file you want to convert into the SRT Content box, keeping the cue numbers and timing lines in place.
3. Open the Case dropdown and pick the style you need - Sentence case for readable soft subs, UPPERCASE for stylised or burned-in captions.
4. Press Run to convert every cue; the rebuilt SRT appears in the output area.
5. Check a few cues that contain proper nouns or acronyms, since a mechanical case fold will lower-case names in lowercase and Sentence case modes and may need a manual touch-up.
6. Confirm the timecodes in the output match the input, then click Copy or Download to save the result as an .srt file.
7. If you started from an ALL-CAPS transcript, run Sentence case once and then use Find and Replace to restore any names the fold flattened.

Example 1 - taming an all-caps transcript. A stenographic transcript arrived entirely in capitals; Sentence case makes it readable as soft subtitles.

Before:
3
00:00:15,000 --> 00:00:18,200
WE LOST THE SIGNAL. CHECK THE RELAY.

After (Case = Sentence case):
3
00:00:15,000 --> 00:00:18,200
We lost the signal. Check the relay.

Both sentences inside the cue are capitalised because the mode restarts after the full stop, and the timing line is byte-identical.

Example 2 - stylised burn-in captions. Choosing UPPERCASE turns Stand clear of the doors. into STAND CLEAR OF THE DOORS. across the whole file, giving the uniform look some broadcast and signage workflows require without retyping a single cue.

• One consistent house style: A file assembled from several sources comes out looking as though one person typed it, which is what clients notice first.
• Better readability where it counts: Sentence case is easier and faster to read than blocks of capitals, which improves comprehension for viewers relying on captions.
• Meets delivery conventions: Workflows that mandate all-caps captions for legibility over picture can be satisfied in one click instead of a retype.
• No retyping, no typos: Converting mechanically avoids the transcription errors that creep in when someone re-keys hundreds of lines by hand.
• Sync stays intact: Since only text changes, you can restyle casing at any point in the process without re-checking timing.
• Confidential scripts stay private: The conversion never leaves your browser, so embargoed dialogue is safe to process.