Last updated May 24, 2026 (UTC)
CaptionPass vs Subtitle Edit
Subtitle Edit is the go-to open-source desktop editor for caption authors. CaptionPass is a different layer: delivery QA — automated checks and repairs tuned for YouTube, TikTok, and HTML5 before you upload or send files to a client.
Subtitle Edit — strengths
- Full cue-by-cue editing, translation, and spell check
- Broad format support and batch operations on a workstation
- No per-day cloud quota — files stay local
Run your file through CaptionPass — free caption converter with a full QA report.
Convert & fix free →CaptionPass — strengths
- Platform delivery presets (YouTube, TikTok, HTML5, LMS)
- Automatic overlap trim, timing repair, and reading-speed flags
- Explainable report — every fix named for client or producer review
- HTTP API for CI/CD without scraping the browser tool
- Free browser tool at captionpass.com/#tool — no install
Recommended workflow
- Author and polish cues in Subtitle Edit (or your NLE).
- Export SRT or WebVTT for the destination.
- Run through CaptionPass with the matching preset and download the report.
- Upload to YouTube Studio or deliver to the client with the audit trail.
See also CaptionPass vs generic converters and What is CaptionPass?
Convert your captions free
Upload on CaptionPass, pick a delivery preset, and download upload-ready output with optional enhanced formatting — free tier, no account required.
Convert & fix free →More guides
- Free online caption converter — SRT, VTT, and delivery QAHow CaptionPass works as a free caption converter with upload-ready and enhanced exports, platform presets, and explainable fixes.
- SRT to VTT converter guide — headers, timestamps, and pitfallsWhen to convert SRT to WebVTT, what breaks if you rename extensions, and how to validate before HTML5 or YouTube delivery.
- SRT vs VTT — when each format silently failsComma vs dot timestamps, WEBVTT headers, and where YouTube, TikTok, and HTML5 bite.
- Caption file encoding — UTF-8, BOM, and garbled textWhy uploads show mojibake or blank cues: UTF-8 vs legacy encodings and quick fixes.
- Burned-in vs soft subtitles — what to deliver whenOpen captions burned into the picture vs separate SRT/VTT tracks — tradeoffs for editors and clients.
- Reading speed for captions — CPS, line length, and platformsCharacters per second, lines per cue, and where YouTube, TikTok, and HTML5 push back.
- YouTube caption upload issues — silent rejection and timingWhen Studio accepts a file but captions vanish: format, line length, drift, and how to validate before publish.
- YouTube rejected my SRT — invalid file and Studio errorsWhen YouTube Studio blocks an SRT upload: encoding, index gaps, bad timestamps, and how to validate before you retry.
- Caption timing drift after export from Premiere or DaVinciWhy captions slip after NLE export: frame rates, timecode starts, and how to normalize before YouTube or client delivery.
- CaptionPass vs generic subtitle convertersFormat swap tools vs delivery QA: explainable fixes, platform presets, and when each approach fits your workflow.
- Caption QA API for CI/CD pipelinesAutomate SRT and VTT validation in GitHub Actions or your build pipeline with POST /api/v1/process and Bearer API keys.
- TikTok subtitle format — short lines, CPS, and clean SRTVertical video reading speed, styling stripped on upload, and export settings that survive TikTok delivery.
- Why your captions are not showing — a triage guideHTML5, YouTube, and TikTok checks when subtitles vanish after upload.
- Fix overlapping subtitlesWhat overlap means and why some players drop overlapping cues.
- TTML and DFXP — broadcast-style timed text on the webNamespaces, timing, styling stripped in practice, and when TTML is the right interchange vs SRT or WebVTT.
- CaptionPass JSON IR and the developer-json presetLossless-ish cue interchange for tooling: when to use JSON IR, version tag, and how it pairs with the HTTP API.
- Timecode, frame rate, and caption syncWhy captions drift or jump: drop-frame vs non-drop, fractional frame rates, and export settings that survive upload.
- WCAG-minded captions — reading speed, sound tags, and burned-in contrastHow WCAG 1.2.x thinking maps to real files: CPS, line length, SDH-style cues, and contrast for open captions.
- Educators & classrooms — CaptionPass for instructionPartner program for instructors: API keys, workspace pilots, Learn guides, and classroom-appropriate access.
Fix in CaptionPass
Free caption converter · Homepage tool · HTTP API (v1) · Pro workspace