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Free YouTube Caption Formatter (SRT / VTT)

Fix subtitles before upload. Convert SRT to VTT (or back), wrap long lines, and spot cues that are too fast to read — paste your caption file and get clean output.

YouTube Caption Formatter

Convert, rewrap, and validate SRT/VTT captions for YouTube uploads.

Caption content (SRT or VTT)

Output format

Max characters per line

Max characters per second

Coming soonToolYour API

Use Free YouTube Caption Formatter (SRT / VTT) in your own app

The free Free YouTube Caption Formatter (SRT / VTT) on this page works in your browser today. We're launching a developer API so you can run the same workflow from your website, mobile app, or internal tools — with API keys, monthly usage limits, and full documentation for registered developers.

  • REST APICall Free YouTube Caption Formatter (SRT / VTT) programmatically — ideal for automation and product integrations.
  • API keysCreate keys in your dashboard, track usage, and rotate access when you need to.
  • Same tool, same qualityAPI output will match what you get from the free web version.
  • Digital ToolsPart of ToolYour's Digital Tools collection — one account for many tools as APIs roll out.

Interested in early access or volume limits for Free YouTube Caption Formatter (SRT / VTT)? Create a free developer account — we'll notify you when this tool's API endpoint is available.

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Description

Accurate captions help deaf and hard-of-hearing viewers, improve comprehension in noisy environments, and can support discoverability. But exported subtitles are often messy: lines too long, wrong format for your player, or cues packed with too many characters per second for anyone to read comfortably. Paste your SRT or WebVTT file, choose your output format, set max characters per line and max reading speed (CPS), and get formatted captions plus warnings on cues that may be too fast. Ideal after auto-transcription, translation exports, or editing in another tool — copy the result straight into YouTube Studio or your video editor.

Frequently Asked Questions

Which formats can I use?

Paste SRT or WebVTT as input. Output can be SRT, VTT, or plain text (dialogue only without timestamps).

What is CPS and why should I care?

CPS is characters per second — how fast someone must read each cue. When CPS is too high, viewers miss words. The tool warns on cues above your max CPS setting (default 20), which is a common accessibility guideline.

What is a good max characters per line?

Many broadcast and web guidelines use about 32–42 characters per line. Default here is 42. Shorter lines are easier on mobile; longer lines fit fewer breaks on desktop.

Can this pull captions from YouTube for me?

No. Paste the caption file or text you already have from your editor, transcription service, or YouTube Studio export. This tool formats and validates — it does not download from videos.

How do I upload captions to YouTube?

In YouTube Studio: Subtitles → select video → Upload file → choose SRT or VTT. Use the formatted output from this tool as your upload file.

Auto-captions vs uploaded files — what is the difference?

YouTube's auto-captions are a helpful start but often need timing and spelling fixes. A cleaned SRT or VTT you upload replaces or supplements them and usually gives viewers a better experience.

Key Features

SRT and VTT conversion

Switch between formats for YouTube Studio, HTML5 players, Premiere, DaVinci, or other tools in your pipeline.

Automatic line wrapping

Break long lines to your chosen character limit so text fits on screen without manual retyping.

Reading-speed warnings

Highlights cues where CPS exceeds your threshold so you can split or shorten them before publish.

Plain text export

Get dialogue-only text when you need a script summary or repurpose content without timestamps.

Copy-ready output

Formatted captions appear in the results panel ready to save as a file or paste into Studio.

How it works

Paste your caption file

Copy SRT or VTT from your transcription tool, editor export, or Studio download.

Choose format and limits

Pick SRT, VTT, or plain text output. Adjust max characters per line and max CPS if needed.

Review warnings and copy

Fix any high-CPS cues in your editor if needed, then copy or save the formatted file for upload.

Caption quality checklist before upload

Sync matters: words should appear when spoken. Keep one or two lines on screen at a time. Split long sentences across cues. Fix proper nouns and technical terms auto-transcription gets wrong. Watch the video once with captions on — especially the intro where viewers decide to stay.

Who benefits most from formatted captions

Tutorial creators (steps read clearly on mobile), interview and podcast clips (fast speech split into readable cues), multilingual teams converting VTT between tools, and educators meeting accessibility expectations for students.

SRT vs VTT in practice

SRT is widely supported by YouTube uploads and classic editors. VTT is common on the web and some modern workflows. If one tool rejects your file, convert to the other format here and try again.

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