SRT vs VTT: Which Subtitle Format Should You Use?

SRT vs VTT: Which Subtitle Format Should You Use?

SRT and VTT are both timed text files. They store caption text plus timestamps. The difference is where they are strongest: SRT is the simple upload workhorse, while VTT is the web-native format for HTML5 video tracks.

If you only need one answer: export SRT for broad platform upload, export VTT for web video players, and keep both when your tool can generate them from the same transcript.

Key Takeaways

• SRT is the safest basic subtitle file for broad platform upload.
• WebVTT starts with WEBVTT and is designed for HTML5 media tracks.
• YouTube supports many caption files and recommends basic formats like .srt for beginners.
• Velocaption exports SRT, VTT, TXT, and JSON from the same local transcript.

What Is an SRT File?

SRT is the plain, boring subtitle format that works almost everywhere. Each cue has a number, a start and end timestamp, and one or more lines of text.

An SRT cue looks like this:

1
00:00:01,229 --> 00:00:02,500
Hello world

The comma before milliseconds is the detail people miss. SRT uses HH:MM:SS,mmm. If you accidentally use dots, some players will reject the file or read it incorrectly.

SRT is good for:

• YouTube uploads,
• simple closed captions,
• social platform subtitle uploads,
• handoff to editors and clients,
• accessibility captions where styling is not required.

YouTube’s supported caption file documentation says SubRip .srt is one of the basic formats it recommends for creators who are new to caption files.

What Is a VTT File?

VTT, usually called WebVTT, is a plain-text timed track format for HTML5 video and audio. MDN describes WebVTT as a format for timed text tracks synchronized with <video> and <audio> content.

A minimal VTT file looks like this:

WEBVTT

00:00:01.229 --> 00:00:02.500
Hello world

Two differences show up immediately:

• the file starts with WEBVTT,
• timestamps use a dot before milliseconds.

VTT is good for:

• HTML5 <track> elements,
• custom web video players,
• web captions with cue metadata,
• player-side caption styling,
• chapter or metadata tracks.

MDN also documents WebVTT cue styling through the WebVTT API and CSS ::cue, but support depends on the destination player. Test before promising styled captions to a client.

Which Format Should You Export for YouTube?

For YouTube, SRT is usually the first file to export. YouTube supports many caption formats and specifically lists SubRip .srt as a basic format for creators who are new to caption files.

That does not mean VTT is wrong. It means SRT is the least surprising upload file when all you need is text plus timing.

Use this decision table:

Velocaption’s caption export flow supports burned-in video and sidecar files, so you do not need to pick only one format while editing.

Why Do Timestamp Separators Break Files?

SRT and VTT look similar enough that people copy one into the other. That is where files break. SRT uses commas for milliseconds. VTT uses dots and requires the WEBVTT header.

Compare:

00:00:03,400 --> 00:00:05,100

00:00:03.400 --> 00:00:05.100

That tiny separator matters. It is also why validators are useful. A file can look fine in a text editor and still fail in the destination player.

Use the SRT validator when you are checking numbered SubRip captions. Use the VTT validator when you are checking WebVTT headers, cue timing, and web-player compatibility.

Should You Burn Captions In Instead?

Burned-in captions are not a subtitle file. They are pixels rendered into the video. Use them when the viewer should always see the text, especially on short-form social platforms where style, position, and retention matter.

Sidecar files are better when captions should be toggleable, searchable, translatable, or reused in multiple languages.

The split is simple:

• Burned-in MP4 for TikTok, Reels, Shorts, paid social, and branded clips.
• SRT or VTT for accessibility, YouTube metadata, course platforms, and web players.
• TXT for notes.
• JSON for custom automation.

If you are making both vertical social clips and accessible course videos, export both. The transcript is already there.

How Velocaption Handles Subtitle Export

Velocaption generates subtitle files from the same word-level transcript used by the visual caption editor. That keeps the sidecar files connected to the edit you actually reviewed.

The export utilities produce:

• SRT with numbered cues and comma timestamps,
• VTT with a WEBVTT header and dot timestamps,
• TXT with plain transcript text,
• JSON with the segment data.

That means one local caption pass can feed YouTube, your website, your LMS, and your archive. Pair it with auto captions without uploading when privacy matters.

Frequently Asked Questions