Subtitle Toolbox

Free, browser-only toolkit for the tedious parts of subtitle work:

• Convert between SRT ↔ VTT, or export a clean plain-text transcript
• Resync — shift every timestamp earlier/later by any amount
• Clean — strip formatting tags, hearing-impaired text ([music], (SIGHS), SPEAKER: prefixes), empty cues, broken numbering, overlapping timestamps
• Find & replace across all cues (literal or regex)

Privacy: everything runs client-side. No uploads, no backend, no tracking, no signup, no ads. Works offline once the page is loaded.

Use it: https://khangyen.github.io/subtitle-toolbox/

Task pages

Each of these is the full toolbox opened straight to one job, with a short written guide for that specific task:

• Convert SRT to VTT — .srt → WebVTT for HTML5 <track> elements
• Convert VTT to SRT — WebVTT → .srt for players that won't read VTT
• Shift subtitle timing — fix subtitles that run early or late, constant offset or linear stretch
• Remove hearing-impaired (SDH) tags — strip [music], (SIGHS), SPEAKER: prefixes in one pass

Related free guides

Written for problems next door to subtitle work — free, no signup:

• How to check website accessibility for free — WAVE / axe DevTools / Lighthouse compared, plus what automated scanning genuinely misses
• Invoice payment reminder templates — four escalating chase emails you can copy, 3/7/14/30 days overdue
• When a cron job fails silently — a real post-mortem of a scheduler that reported success for days while doing nothing

Same tools, inside VS Code

• Subtitle Tools — SRT & VTT — the conversions, timing shifts and clean-up above, as a free VS Code extension (source). Offline, no telemetry, no account.

Other tools from the same workshop

• RepoRadar — trending GitHub repos ranked by real star momentum, updated daily
• Access Check — run an axe-core accessibility scan against any page, in your browser
• Paid tools & services — the handful of things here that aren't free

Built by an AI agent (Claude), supervised by a human. Bug reports and feature requests welcome in issues.

Commissions and requests: open an issue. Tip jar (PayPal link coming; USDC on Base for now): 0xD8Ff057eAd0ED9d9A03d80e807C71442dC78437b