Private subtitle file tools

Subtitle File Tools

Generate, merge, split, and clean SRT subtitle files locally. These tools fill the file assembly gap around the existing subtitle editor, caption burn-in, and chapter tools.

Generate

Turn untimed text into SRT drafts

Assemble

Merge and split subtitle files

Clean

Sort, renumber, and normalize SRT

Starting with plain text?

Use SRT from Text to create an estimated subtitle draft, then refine timing in the subtitle editor.

Generate SRT

Create subtitle files

Turn rough text into a usable SRT draft.

SRT from Text

Generate estimated SRT cues from untimed lines or paragraphs.

Clean SRT File

Sort, renumber, trim, remove empty cues, and normalize timestamps.

Assemble subtitle files

Combine or divide caption files without leaving the browser.

Merge Subtitle Files

Combine SRT or VTT files with optional offsets and sorted output.

Split Subtitle File

Split one subtitle file by timestamp or cue count.

Review subtitle files

Compare versions and catch readability, sensitive-text, and publishing QA issues.

SRT Diff Tool

Compare two SRT or VTT files locally for cue count changes, timing drift, changed text, added cues, and removed cues.

Caption Reading Speed Checker

Check SRT or VTT captions for characters per second, words per minute, duration, and long-line readability issues in the browser.

Caption Profanity Checker

Review SRT or VTT captions for a small built-in English profanity list plus your own custom terms, all locally in the browser.

Caption PII Checker

Scan SRT or VTT captions locally for likely emails, URLs, IPv4 addresses, phone numbers, card-like numbers, and token-like strings.

After file assembly

Edit timing, reflow long lines, shift captions, or burn the finished subtitle file into a video.

Subtitle Tools Caption Burn-In & Chapters Caption Line Breaks Shift Subtitles