Does it change my caption timings?

No. It keeps every cue number, its order and its timestamps. It flags overlaps and timing problems for you instead of moving them.

Which caption files does it work with?

SRT and WebVTT exports from your editor. In Claude, attach a copy renamed to .txt and say which format it is, because Claude’s upload list doesn’t name .srt or .vtt.

Does it check reading speed or line length?

Only when you give it your counting rule and limit. It doesn’t assume a universal standard, and it never changes timing to meet one.

Do I still need to watch the video?

Yes. It checks caption text and file structure, not the audio, sync or position on screen. Import the corrected file into a duplicate caption track and watch it before you publish.

Which plan do I need?

Claude works on any plan, including Free, with Code execution and file creation turned on. ChatGPT Work needs file uploads and file creation, and on the web it needs Plus, Pro, Business, Enterprise or Edu.

Caption Checker

Clean a caption file and flag playback checks

Caption Checker is an AI agent you set up in the ChatGPT or Claude you already use. Upload an SRT or WebVTT caption export, and it makes a corrected copy with only the fixes your rules support, a list of every change and a short list of cues to check on playback.

Pick your AI for the steps and the prompt

About each AI:ChatGPT WorkClaude app

Checked 29 Oct 2026. Not run by JuicyAgents yet. Written from each AI’s official docs; the example is illustrative.

Caption Checker · reply in the chat

3 cues corrected, 2 to check on playback

Cue 1“We did not approve the change.”
Cue 2Gets a full stop and keeps [unclear]
Cue 3“Thank you.”
0.5-second overlapFlagged

Illustrative example: a fictional three-cue SRT file with a checked correction for cue 1, an [unclear] word in cue 2 and an overlap between cues 1 and 2.

How it works

What it does for you, and what it leaves to you.

Video editors describe repeated caption corrections, inconsistent punctuation and awkward line breaks after automatic transcription. A shared style guide helps, but the final video still needs review.

Upload the caption export you already have. The assistant reads the cue structure, applies supported text corrections and returns a new caption file with a change list. You do not need to label every cue or prepare checked wording for the whole video. Audio meaning, synchronization and visual placement still need a final playback check.

You stay in charge. Review the change list, especially any corrected negation, name or number. Import the new file into a duplicate caption track and watch the final video before publishing.

You get

A corrected caption file, cue change list and focused playback queue

It never

Change a timestamp or the order of cues
Guess a missing word, negation, name or speaker
Drop a cue it can’t read, or edit your original file
Claim the captions are in sync or accessible without a playback check

The corrected file it makes

The example above, in words.

Three cues remain. Cue 1 becomes “We did not approve the change.” Cue 2 gets a full stop and keeps [unclear] for a playback check. Cue 3 becomes “Thank you.” The 0.5-second overlap is flagged. The corrected caption file, a change list and a playback list are created only if file tools are available.

Settings

The setup prompt starts with the defaults, marked here.

Review order

Change the order of the review list. Both views produce the same corrected caption file.

By cue (default)
By issue type

Buy instead

Ready-made products that do a similar job, if you would rather pay for one.

Happy ScribeHappy Scribe creates AI subtitles from video or audio and machine-translates them into 80+ languages, so you can correct text, timing, reading speed and line length in its editor before exporting files such as SRT or VTT.

Questions people ask

Does it change my caption timings?: No. It keeps every cue number, its order and its timestamps. It flags overlaps and timing problems for you instead of moving them.
Which caption files does it work with?: SRT and WebVTT exports from your editor. In Claude, attach a copy renamed to .txt and say which format it is, because Claude’s upload list doesn’t name .srt or .vtt.
Does it check reading speed or line length?: Only when you give it your counting rule and limit. It doesn’t assume a universal standard, and it never changes timing to meet one.
Do I still need to watch the video?: Yes. It checks caption text and file structure, not the audio, sync or position on screen. Import the corrected file into a duplicate caption track and watch it before you publish.
Which plan do I need?: Claude works on any plan, including Free, with Code execution and file creation turned on. ChatGPT Work needs file uploads and file creation, and on the web it needs Plus, Pro, Business, Enterprise or Edu.

Have us set it up

Rather not set it up yourself?

We set up Caption Checker in your own accounts and the AI you already pay for, test it on your real work, and hand it over with a short walkthrough.

From $299

Runs in your accounts; you own everything
Tested before handover
Money back if we can’t make it work

Request a setup