SRT Validator
SRT Input
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Validation Results
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About SRT Validator
Our SRT Validator is a powerful, free online tool that ensures your SRT (SubRip Subtitle) files meet proper format standards and timing requirements. SRT files are the most widely used subtitle format across video players, streaming platforms, and editing software worldwide. Our validator checks syntax, timestamps, sequential numbering, and provides detailed feedback to help you create perfect subtitle files.
What is SRT Format?
SRT (SubRip Subtitle) format is the universal standard for video subtitles. Created by the SubRip software, SRT files contain numbered, timestamped text blocks that display synchronized subtitles during video playback. The format is compatible with virtually all video players including VLC, Windows Media Player, YouTube, Netflix, and professional video editing software like Adobe Premiere Pro and Final Cut Pro.
SRT Format Specification
Standard SRT Structure:
1 00:00:00,000 --> 00:00:03,500 First subtitle text appears here 2 00:00:03,500 --> 00:00:07,200 Second subtitle follows 3 00:00:07,200 --> 00:00:10,800 Third subtitle continues the sequence
SRT Validation Features
- Sequential Numbering: Validates proper subtitle numbering sequence
- Timestamp Format: Checks HH:MM:SS,mmm --> HH:MM:SS,mmm structure
- Time Validation: Verifies chronological order and valid time values
- Block Structure: Ensures proper spacing between subtitle blocks
- Content Validation: Checks for missing or empty subtitle text
- Error Reporting: Provides specific line numbers for issues found
Common SRT Issues
Incorrect Numbering: Non-sequential or missing subtitle numbers.
Invalid Timestamps: Wrong time format or out-of-range values.
Time Order Issues: Subtitles not in chronological sequence.
Missing Text: Timestamp entries without subtitle content.
Format Structure: Incorrect spacing or block formatting.
Character Encoding: Special characters not properly encoded.
SRT Timestamp Format
Time Format
- • Format: HH:MM:SS,mmm
- • Hours: 00-99 (two digits)
- • Minutes: 00-59 (two digits)
- • Seconds: 00-59 (two digits)
- • Milliseconds: 000-999 (three digits)
Time Range
- • Separator: " --> " (space-arrow-space)
- • Start time comes first
- • End time comes second
- • End time must be after start time
- • Example: 00:01:30,500 --> 00:01:33,200
Why Validate SRT Files?
Proper SRT validation ensures your subtitle files work seamlessly across all video players and platforms. Invalid SRT files may cause synchronization issues, display errors, or complete failure to load subtitles. Our validator helps you maintain professional standards and ensures compatibility with popular video software, streaming services, and mobile applications.
Supported Platforms & Applications
Video Players: VLC Media Player, Windows Media Player, QuickTime, PotPlayer, MPC-HC
Streaming Services: YouTube, Vimeo, Twitch, Facebook Video, Netflix
Editing Software: Adobe Premiere Pro, Final Cut Pro, DaVinci Resolve, Camtasia
Mobile Apps: MX Player, VLC for Mobile, Plex, Infuse
Web Browsers: All modern browsers with HTML5 video support
Best Practices for SRT Files
- Keep subtitle lines under 40 characters for optimal readability
- Maintain 2-3 second minimum display time for each subtitle
- Use UTF-8 encoding for international characters
- Ensure proper timing synchronization with video content
- Test subtitles with your target video player before distribution
- Maintain consistent formatting throughout the file