# Clip Caption Kit

> Turn one master SRT and a CSV of clip time ranges into separate, clip-relative SRT and TXT files. Batch-generate organized subtitle deliverables in one ZIP.

> Site: https://clipcaptionkit.com

## Core facts

Clip Caption Kit is a browser-based subtitle delivery tool. It turns one master SRT file and a CSV of clip time ranges into separate, clip-relative SRT and TXT files, packaged in one ZIP with a manifest.csv that records each clip's range, caption count, boundary policy and warnings.
What is a clip-relative subtitle file? It uses the start of a video clip as time zero. Each retained cue is re-timed relative to that point; the first cue may begin later than 00:00:00,000. You create one by subtracting the clip's start time from every caption timestamp in the master SRT: 03:45.500 − 03:42.000 = 00:03.500.
Terminology: "clip-relative subtitle", "re-timed subtitle", "reset to 00:00", "clip-start-relative timing" and "zero-based caption timing" all refer to the same thing on this site.
What Clip Caption Kit is NOT: not a video editor, not an AI transcription service, not a subtitle translator. It does not upload or edit video; it re-times text subtitle files against clip ranges you provide.
Last updated: 2026-09-14.
Free plan: 3 projects per UTC day with up to 100 subtitle cues per project.
Studio plan: unlimited projects and cues at USD 9.99 per month.
The video never has to be uploaded; only the master SRT and the timeline CSV are processed.
Uploaded sources and exported packages are deleted after 24 hours; only project records and anonymous usage events remain.
Timecodes accept HH:MM:SS.mmm and HH:MM:SS,mmm. Captions crossing a clip boundary are trimmed to the boundary or excluded per clip.
The SRT to VTT, WebVTT to SRT, SRT to text, SRT timing and subtitle maker tools run locally in the browser without an account or file upload.
Simplified Chinese versions of every page are served under https://clipcaptionkit.com/zh with language="zh-CN"; the English original and the Chinese variant cross-link with hreflang alternates.

## Machine-readable entry points

- [API catalog](https://clipcaptionkit.com/.well-known/api-catalog) — RFC 9727 linkset naming this site's HTTP API (application/linkset+json; profile="https://www.rfc-editor.org/info/rfc9727")
- [OpenAPI description](https://clipcaptionkit.com/openapi.json) — application/json
- [This digest](https://clipcaptionkit.com/llms.txt) — text/plain, the page list, core facts and FAQ digest
- [Full digest](https://clipcaptionkit.com/llms-full.txt) — text/plain, one section per page in both languages
- [Health probe](https://clipcaptionkit.com/api/health) — application/json
- [Sitemap](https://clipcaptionkit.com/sitemap.xml) — application/xml, every page in both languages

## Verification fixture (deterministic output)

Fixed inputs (UTF-8, LF) and the exact outputs the batch pipeline must produce:

- `verification-master.srt` SHA-256: `48dc6e6435773124c0a548604e96cdbbfa78196cfacef341e6992f85f6ea6029`
- `verification-clips.csv` SHA-256: `b37fd0f3cd8a01d62dc0161bb49f93c796ef30eb800c8e37687dd43c36345174`
- `srt/intro.srt` (CRLF) SHA-256: `5d5aa96a51e0b3ab9780f85ba633ba8a6f4bfefd66142b6c58d4271693913a7b`
- `txt/intro.txt` (LF) SHA-256: `a9e83523a6cb1aa198a5432317cda1705656447aa61bdae4357e0ff54b43bad7`
- `manifest.csv` (CRLF) SHA-256: `1e4ecddbd7997a79a8a613e1a182f4077cc1dc17457430456cad077e0e8e13cf`

Reproduce in the product at `/verification` (and `/zh/verification`): the fixed inputs, their SHA-256 hashes and the exact expected outputs.

## Pages (detailed)

## Subtitle Delivery Workflow for Every Video Clip

Title: Subtitle Delivery Workflow for Clips | Clip Caption Kit
Description: Run a subtitle delivery workflow for every clip: upload one master SRT and a timeline CSV, review re-timed captions, and export SRT, TXT and a manifest ZIP.
Label: Home
Type: home
Updated: 2026-09-25
Language: en-US

Full page: https://clipcaptionkit.com/

## 把一个 SRT 批量拆分成多个片段字幕

Title: Clip Caption Kit — 批量把一个 SRT 拆分成多个片段字幕
Description: Clip Caption Kit 是一款浏览器内的字幕交付工具：把一个主字幕 SRT 和一份剪辑时间线 CSV 批量拆分成每个片段独立的 SRT 与 TXT 文件，并打包为一个带 manifest 清单的 ZIP。无需上传视频，文件仅保留 24 小时。
Label: 中文首页
Type: home
Updated: 2026-09-25
Language: zh-CN

Full page: https://clipcaptionkit.com/zh

## How to Run a Subtitle Delivery Workflow for Video Clips

Title: Subtitle Delivery Workflow Guide for Editors
Description: A practical subtitle delivery workflow for editors: prepare one master SRT and clip CSV, check boundaries, and export re-timed SRT, TXT and manifest files.
Label: Subtitle delivery workflow
Type: guide (hub: guides)
Updated: 2026-09-25
Language: en-US

Full page: https://clipcaptionkit.com/subtitle-delivery-workflow

## 如何完成视频片段字幕交付流程

Title: 视频片段字幕交付流程指南
Description: 从一份主字幕 SRT 和片段时间线 CSV 开始，逐段检查边界字幕和时间码，再导出重新计时的 SRT、TXT 与 manifest 清单。本指南附带可直接使用的批量工具。
Label: 字幕交付流程
Type: guide (hub: guides)
Updated: 2026-09-25
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/subtitle-delivery-workflow

## Split SRT by Timestamp

Title: Extract an SRT Time Range Online
Description: Upload an SRT, enter a start and end time, and export that subtitle segment. Optionally reset timestamps to 00:00 and choose how boundary captions are handled.
Label: Split by timestamp
Type: tool (hub: tools)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/tools/split-srt-by-timestamp

## 按时间码拆分 SRT

Title: 在线按时间码拆分 SRT — 提取指定时间范围的字幕
Description: 上传 SRT，输入开始与结束时间，导出该时间范围内的字幕。可以把时间码重置为 00:00，并选择跨越边界字幕的处理方式。
Label: 按时间码拆分
Type: tool (hub: tools)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/split-srt-by-timestamp

## Split an SRT File Online

Title: Split an SRT File Online by Time
Description: Split an SRT file at an exact timestamp. Keep master timing or reset the second part, choose how boundary captions are handled, and download both parts.
Label: SRT splitter
Type: tool (hub: tools)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/tools/srt-splitter

## 在线拆分 SRT 文件

Title: 免费在线 SRT 拆分器 — 按时间拆分字幕文件
Description: 在精确的时间码处拆分 SRT 文件：保留主时间轴或把后半段重置到 00:00，选择跨越边界字幕的处理方式，并下载拆分后的两个部分。
Label: SRT 拆分器
Type: tool (hub: tools)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/srt-splitter

## Batch Split One SRT into Multiple Subtitle Files

Title: Batch SRT Splitter for Multiple Clips
Description: Upload one master SRT and a CSV of clip names, start times and end times. Generate separate, re-timed SRT and TXT files for every clip in one ZIP.
Label: Batch SRT splitter
Type: tool (hub: tools)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/tools/batch-srt-splitter

## 把一个 SRT 批量拆分成多个字幕文件

Title: 批量 SRT 拆分器 — 把一个 SRT 拆成多个片段文件
Description: 上传一个主字幕 SRT 和一份含片段名称、开始与结束时间的 CSV，一次为每个片段生成独立、重新计时的 SRT 与 TXT 文件，并打包为一个 ZIP。
Label: 批量拆分 SRT
Type: tool (hub: tools)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/batch-srt-splitter

## Convert SRT to VTT Online

Title: SRT to VTT Converter Online
Description: Convert SRT subtitles to WebVTT online for free. Preview every cue and download a standards-based VTT file without uploading it or creating an account.
Label: SRT to VTT
Type: tool (hub: tools)
Updated: 2026-09-12
Language: en-US

Full page: https://clipcaptionkit.com/tools/srt-to-vtt

## 在线把 SRT 转换为 VTT

Title: SRT 转 VTT 在线转换器 — 免费 WebVTT 工具
Description: 免费在线把 SRT 字幕转换成 WebVTT：逐条预览字幕内容，下载符合标准的 VTT 文件，无需上传文件，也无需注册账号。
Label: SRT 转 VTT
Type: tool (hub: tools)
Updated: 2026-09-12
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/srt-to-vtt

## Convert WebVTT to SRT Online

Title: WebVTT to SRT Converter Online
Description: Convert WebVTT subtitles to SRT online for free. Keep cue timings and text, review unsupported VTT features, and download locally without an account.
Label: WebVTT to SRT
Type: tool (hub: tools)
Updated: 2026-09-12
Language: en-US

Full page: https://clipcaptionkit.com/tools/webvtt-to-srt

## 在线把 WebVTT 转换为 SRT

Title: WebVTT 转 SRT 在线转换器 — 免费 VTT 工具
Description: 免费在线把 WebVTT 字幕转换成 SRT：保留字幕时间与文本，查看不受支持的 VTT 特性说明，本地下载且无需注册账号。
Label: WebVTT 转 SRT
Type: tool (hub: tools)
Updated: 2026-09-12
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/webvtt-to-srt

## Free Online Subtitle Maker

Title: Free Online Subtitle Maker
Description: Create an SRT subtitle file online by entering cue text and timestamps. Validate every caption, preview the result, and download it without signing in.
Label: Subtitle maker
Type: tool (hub: tools)
Updated: 2026-09-12
Language: en-US

Full page: https://clipcaptionkit.com/tools/subtitle-maker

## 免费在线字幕制作工具

Title: 免费在线字幕制作工具 — 生成 SRT 字幕文件
Description: 输入字幕文本与时间码，在线创建 SRT 字幕文件：逐条校验字幕、预览生成结果，无需登录即可下载，全部在浏览器内完成。
Label: 字幕制作
Type: tool (hub: tools)
Updated: 2026-09-12
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/subtitle-maker

## Shift SRT Subtitle Timing

Title: Shift SRT Timing Earlier or Later
Description: Fix SRT timing by shifting every subtitle earlier or later by one exact offset. Preview clipped cues and download the adjusted file locally for free.
Label: SRT timing
Type: tool (hub: tools)
Updated: 2026-09-12
Language: en-US

Full page: https://clipcaptionkit.com/tools/srt-timing

## 调整 SRT 字幕时间轴

Title: SRT 时间轴工具 — 整体前移或后移字幕
Description: 用一个精确的偏移量把整份 SRT 字幕整体前移或后移，修复时间轴不同步：预览被裁剪的字幕，免费在本地下载调整后的文件。
Label: SRT 时间轴
Type: tool (hub: tools)
Updated: 2026-09-12
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/srt-timing

## Convert SRT to Text Online

Title: SRT to Text Converter Online
Description: Convert SRT subtitles to clean plain text online. Remove cue numbers and timestamps, preview the transcript, and download TXT locally without an account.
Label: SRT to text
Type: tool (hub: tools)
Updated: 2026-09-12
Language: en-US

Full page: https://clipcaptionkit.com/tools/srt-to-text-converter

## 在线把 SRT 转换为纯文本

Title: SRT 转文本在线转换器 — 提取纯文本转录
Description: 在线把 SRT 字幕转换成干净的纯文本：去掉字幕序号与时间码，预览转录文本，免费在本地下载 TXT 文件，无需注册账号。
Label: SRT 转文本
Type: tool (hub: tools)
Updated: 2026-09-12
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/tools/srt-to-text-converter

## Create Separate SRT Files for Multiple Video Clips

Title: Subtitle Files for Multiple Video Clips
Description: Turn one long-video SRT into separate subtitle files for every edited clip. Use clip start and end times, reset timestamps, and export all files together.
Label: Subtitles for video clips
Type: use-case (hub: use-cases)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/use-cases/subtitles-for-video-clips

## 为多个视频片段创建独立的 SRT 文件

Title: 为多个视频片段创建独立的 SRT 字幕文件
Description: 把一部长视频的 SRT 拆成每个剪辑片段独立字幕文件：使用片段的开始与结束时间、重置时间码，并一次性导出全部字幕文件。
Label: 视频片段字幕
Type: use-case (hub: use-cases)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/use-cases/subtitles-for-video-clips

## Turn One Podcast SRT into Subtitles for Every Clip

Title: Podcast Clip Subtitles from One Transcript
Description: Split a podcast's master SRT into separate, re-timed subtitle files for Shorts, Reels and social clips using a CSV of clip time ranges.
Label: Podcast clip subtitles
Type: use-case (hub: use-cases)
Updated: 2026-09-14
Language: en-US

Full page: https://clipcaptionkit.com/use-cases/podcast-clip-subtitles

## 把一期播客 SRT 变成每个片段的字幕

Title: 用一份播客主字幕批量生成片段 SRT 字幕文件
Description: 把一期播客的主字幕 SRT，按片段时间范围拆成 Shorts、Reels 与社交短片各自独立、从 00:00 开始的字幕文件，一次导出。
Label: 播客片段字幕
Type: use-case (hub: use-cases)
Updated: 2026-09-14
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/use-cases/podcast-clip-subtitles

## Turn One Course SRT into Subtitles for Every Module

Title: Course Module Subtitles from One Recording
Description: Split a course recording's master SRT into separate, re-timed subtitle files for every module or chapter, each starting at 00:00, from one CSV.
Label: Course module subtitles
Type: use-case (hub: use-cases)
Updated: 2026-09-14
Language: en-US

Full page: https://clipcaptionkit.com/use-cases/course-module-subtitles

## 把一节课程 SRT 变成每个章节的字幕

Title: 把一节课程录像的字幕按章节拆成多个 SRT
Description: 把一节长课程的主字幕 SRT，按章节起止时间拆成每个模块独立、从 00:00 开始的字幕文件，修订时只需重跑一次。
Label: 课程章节字幕
Type: use-case (hub: use-cases)
Updated: 2026-09-14
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/use-cases/course-module-subtitles

## What Is a Clip-Relative Subtitle?

Title: What Is a Clip-Relative Subtitle?
Description: A clip-relative subtitle file starts at 00:00 for its own clip. Learn the exact definition, the subtraction formula, and which terms mean the same thing.
Label: Clip-relative subtitle
Type: guide (hub: guides)
Updated: 2026-09-14
Language: en-US

Full page: https://clipcaptionkit.com/guides/what-is-a-clip-relative-subtitle

## 什么是片段相对字幕？

Title: 什么是片段相对字幕？
Description: 片段相对字幕是指时间码从片段起点 00:00 开始的字幕文件。本文给出准确定义、相减公式，并说明哪些说法是同一个意思。
Label: 片段相对字幕
Type: guide (hub: guides)
Updated: 2026-09-14
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/what-is-a-clip-relative-subtitle

## How to Split an SRT File by Time Range

Title: How to Split an SRT File by Time Range
Description: Learn how to extract subtitles between two timestamps, handle captions crossing the boundaries, renumber cues, and reset the new SRT to 00:00.
Label: Split SRT by time range
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/how-to-split-srt-by-time-range

## 如何按时间范围拆分 SRT 文件

Title: 如何按时间范围拆分 SRT 文件
Description: 了解如何提取两个时间码之间的字幕、处理跨越边界的字幕、重新编号，并把新的 SRT 时间码重置到 00:00，附带手动与工具两种做法。
Label: 按时间范围拆分
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/how-to-split-srt-by-time-range

## How to Split One Master SRT for Multiple Video Clips

Title: Split One Master SRT for Video Clips
Description: A practical workflow for turning one long-video SRT and a list of clip time ranges into separate, re-timed subtitle files for every clip.
Label: Split a master SRT for clips
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/how-to-split-master-srt-for-video-clips

## 如何为多个视频片段拆分一个主字幕 SRT

Title: 如何为多个视频片段拆分一个主字幕 SRT
Description: 一套可执行的流程：把一部长视频的 SRT 与一份片段时间范围清单，转换成每个片段独立、重新计时到 00:00 的字幕文件并打包交付。
Label: 拆分主字幕 SRT
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/how-to-split-master-srt-for-video-clips

## How to Convert SRT to TXT

Title: Convert SRT to TXT Without Timecodes
Description: Convert an SRT subtitle file to clean plain text: strip cue numbers and timecodes, keep the spoken captions, and export one file or many clips in a batch.
Label: Convert SRT to TXT
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/how-to-convert-srt-to-txt

## 如何把 SRT 转换成 TXT

Title: 如何把 SRT 转换成 TXT — 保留干净的转录文本
Description: 把 SRT 字幕文件转换成干净的纯文本：去掉字幕序号与时间码、保留口播文案，既可以导出单个文件，也可以批量导出多个片段。
Label: SRT 转 TXT
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/how-to-convert-srt-to-txt

## How to Split SRT Files for Free

Title: Free Ways to Split SRT Files
Description: Split SRT files for free with text editors, online tools, or the Free plan (3 projects per UTC day, up to 100 cues per project). No video upload required.
Label: Free SRT splitting
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/free-ways-to-split-srt-files

## 如何免费拆分 SRT 文件

Title: 免费拆分 SRT 文件的方法 — 每个片段一份字幕
Description: 免费拆分 SRT 文件的几种方式：用文本编辑器手动处理、使用在线工具，或使用免费版（每日 3 个项目、每项目最多 100 条字幕，按 UTC 重置），全程无需上传视频。
Label: 免费拆分 SRT
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/free-ways-to-split-srt-files

## Export Separate SRT Files for Each Video Clip

Title: Export Separate SRT Files for Each Video Clip
Description: Turn one master SRT into a separate SRT file per clip. Use each clip's start as time zero, re-time retained captions relative to it and download the files together.
Label: Export separate SRT per clip
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/export-separate-srt-files-for-video-clips

## 为每个视频片段导出独立的 SRT 文件

Title: 为每个视频片段导出独立的 SRT 文件
Description: 把一份主字幕 SRT 转换成每个片段一份的 SRT：以片段起点作为时间轴零点，按此重新计时保留字幕，并一次性下载全部字幕文件。
Label: 按片段导出 SRT
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/export-separate-srt-files-for-video-clips

## Fix Subtitles Out of Sync After Trimming a Video

Title: Fix SRT Timing After Trimming Video
Description: Why subtitles go out of sync after you trim a video, and how to fix it: the SRT still follows the original timeline, so subtract the clip start from every timestamp.
Label: Out of sync after trimming
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/subtitles-out-of-sync-after-trimming-video

## 修复剪辑视频后字幕不同步的问题

Title: 剪辑后字幕不同步？修复 SRT 时间码
Description: 为什么裁剪视频后字幕会不同步，以及如何修复：SRT 仍然沿用原始时间轴，只要从每个时间码中减去片段起点时间即可对齐。
Label: 剪辑后字幕不同步
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/subtitles-out-of-sync-after-trimming-video

## How to Reset SRT Timestamps to Zero

Title: Reset SRT Timestamps to 00:00
Description: Reset SRT timestamps to 00:00 after trimming a video. Subtract the clip start time from every caption timestamp so the subtitle file matches the clip timeline.
Label: Reset SRT timestamps
Type: guide (hub: guides)
Updated: 2026-09-10
Language: en-US

Full page: https://clipcaptionkit.com/guides/reset-srt-timestamps-to-zero

## 如何把 SRT 时间码重置到 00:00

Title: 把 SRT 时间码重置到 00:00 — 让字幕从零开始
Description: 裁剪视频后把 SRT 时间码重置到 00:00：从每条字幕的时间码中减去片段起点时间，让字幕文件与片段自身的时间轴完全对齐。
Label: 重置 SRT 时间码
Type: guide (hub: guides)
Updated: 2026-09-10
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/guides/reset-srt-timestamps-to-zero

## Verify the Output Is Deterministic

Title: Verify Deterministic Subtitle Output
Description: Reproduce a fixed subtitle export byte for byte: published inputs, SHA-256 hashes, and the exact expected outputs of the batch pipeline.
Label: Verification
Type: guide
Updated: 2026-09-14
Language: en-US

Full page: https://clipcaptionkit.com/verification

## 验证输出是确定性的

Title: 验证字幕输出的确定性
Description: 用公开的固定输入逐字节复现一次批量导出：输入与输出的 SHA-256 哈希，以及管线应生成的确切字幕内容。
Label: 可验证性
Type: guide
Updated: 2026-09-14
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/verification

## Upgrade to Studio

Title: Pricing: Free and Studio Plans
Description: Compare the Free and Studio plans: Free includes 3 projects per UTC day with up to 100 captions per project, while Studio removes both limits for USD 9.99 per month.
Label: Pricing
Type: pricing
Updated: 2026-09-04
Language: en-US

Full page: https://clipcaptionkit.com/pricing

## 升级到 Studio

Title: 价格
Description: 对比免费版与 Studio 版：免费版每日 3 个项目、每项目最多 100 条字幕（按 UTC 重置）；Studio 每月 9.99 美元，解除两项限制，适合逐集或整季交付。
Label: 价格
Type: pricing
Updated: 2026-09-04
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/pricing

## About Clip Caption Kit

Title: About Clip Caption Kit
Description: Who builds Clip Caption Kit, who it serves, and what it is not: deterministic batch subtitle delivery for editors, with 24-hour file deletion and email support.
Label: About
Type: about
Updated: 2026-09-14
Language: en-US

Full page: https://clipcaptionkit.com/about

## 关于 Clip Caption Kit

Title: 关于 Clip Caption Kit
Description: Clip Caption Kit 由谁制作、服务于谁、以及它不是什么：面向剪辑师的确定性批量字幕交付，文件 24 小时内删除，并提供邮件支持。
Label: 关于
Type: about
Updated: 2026-09-14
Language: zh-CN

Full page: https://clipcaptionkit.com/zh/about

## FAQ digest

- **Q: What is a clip-relative subtitle file?**
  A: It uses the start of a video clip as time zero; each retained cue is re-timed relative to that point, and the first cue may begin later than 00:00:00,000. Example: 03:45.500 − 03:42.000 = 00:03.500. Full definition: https://clipcaptionkit.com/guides/what-is-a-clip-relative-subtitle

- **Q: How do I split one master SRT into multiple clip subtitle files?**
  A: Upload the master SRT once and a timeline CSV with one row per clip (name, start, end). The tool re-times the captions for every row and exports an SRT and TXT pair per clip inside one ZIP.

- **Q: Are the exported subtitles re-timed to each clip?**
  A: Yes. The clip start becomes 00:00:00,000 on the clip-relative timeline; the first cue may begin later when no caption overlaps the clip start.

- **Q: What happens to captions that cross a clip boundary?**
  A: You decide per clip: trim at the boundary or exclude the partial caption, and the choice is recorded in manifest.csv.

- **Q: Do I need to upload the video?**
  A: No. Only the subtitle file and the clip time ranges are needed; the video never leaves your machine.

- **Q: How long are my files stored?**
  A: Sources and exported packages are stored only for processing and deleted after 24 hours.

- **Q: What is included in the free plan?**
  A: Three projects per UTC day with up to 100 subtitle cues per project; Studio removes both limits at USD 9.99 per month.

- **Q: How can I verify the output is deterministic?**
  A: Reproduce the published fixture byte for byte: https://clipcaptionkit.com/verification lists fixed inputs, SHA-256 hashes, and the exact expected outputs.


## 中文常见问题 (Chinese FAQ digest)

- **Q: 什么是片段相对字幕？**
  A: 片段相对字幕以视频片段的起点作为时间轴零点；保留的字幕按这个起点重新计时，第一条字幕可以晚于 00:00。示例：03:45.500 − 03:42.000 = 00:03.500。完整定义：https://clipcaptionkit.com/zh/guides/what-is-a-clip-relative-subtitle

- **Q: 怎么把一个 SRT 批量拆分成多个片段字幕？**
  A: 上传一个主 SRT，再上传一份每行定义一个片段的时间线 CSV（名称、开始、结束）。工具会为每一行重新计时，并为每个片段导出一份 SRT 与一份 TXT，最后打包成一个 ZIP。

- **Q: 导出后的字幕时间码会重置吗？**
  A: 会。片段起点会成为片段相对时间轴的 00:00:00,000；如果起点处没有字幕重叠，第一条字幕可以晚于零点出现。

- **Q: 跨片段边界的字幕怎么处理？**
  A: 可以按片段选择：在边界处裁剪，或完全排除这条字幕。选择会记录在 manifest.csv 里，之后的修订可以原样复现。

- **Q: 需要上传视频吗？**
  A: 不需要。整个流程只需要字幕文件和片段时间范围，视频不会离开你的电脑。

- **Q: 怎么验证输出是确定性的？**
  A: 按公开夹具逐字节复现：https://clipcaptionkit.com/zh/verification 列出了固定输入、SHA-256 哈希与确切预期输出。

- **Q: 文件会被保留多久？**
  A: 上传的源文件和导出的 SRT、TXT、manifest 只用于处理，24 小时后删除，仅保留项目记录与匿名使用事件。


## External standards (外部规范)

The format claims above rest on these specifications. Each is cited on the page that makes the claim:

- W3C WebVTT: The Web Video Text Tracks Format — The WebVTT cue structure and the period-separated millisecond timestamps this site emits. https://www.w3.org/TR/webvtt1/
- MDN: WebVTT API — Reading WebVTT tracks in a browser, which is what the local converter previews against. https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API
- SubRip subtitle format — The `HH:MM:SS,mmm --> HH:MM:SS,mmm` cue timing and comma-separated milliseconds the parser accepts. https://en.wikipedia.org/wiki/SubRip
- RFC 4180: Common Format and MIME Type for CSV Files — The comma-separated `manifest.csv` written into every export ZIP, including its quoting and CRLF rules. https://www.rfc-editor.org/rfc/rfc4180
- RFC 5646: Tags for Identifying Languages (BCP 47) — The `en-US` and `zh-CN` language tags declared in the hreflang alternates of every page. https://www.rfc-editor.org/rfc/rfc5646

上述格式主张所依据的规范：

- W3C WebVTT：Web 视频文本轨道格式 — WebVTT 的 cue 结构，以及本站输出所用的点号毫秒时间码。 https://www.w3.org/TR/webvtt1/
- MDN：WebVTT API — 在浏览器中读取 WebVTT 轨道，本地转换器即以此为预览基准。 https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API
- SubRip 字幕格式 — 解析器所接受的 `HH:MM:SS,mmm --> HH:MM:SS,mmm` cue 时间轴与逗号毫秒格式。 https://en.wikipedia.org/wiki/SubRip
- RFC 4180：CSV 通用格式与 MIME 类型 — 每个导出 ZIP 中的逗号分隔 manifest.csv，含其引号与 CRLF 规则。 https://www.rfc-editor.org/rfc/rfc4180
- RFC 5646：语言标识标签（BCP 47） — 每个页面 hreflang 备选链接中声明的 `en-US` 与 `zh-CN` 语言标签。 https://www.rfc-editor.org/rfc/rfc5646