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Overview

Subtitle Readability & Compliance Auditor

Validate subtitle files for character-per-second (CPS) limits, line length, and timing overlaps to ensure readability.

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#subtitle #srt #ass #cps #readability

Subtitle Readability Auditor

Validate .srt and .ass files for CPS limits, overlaps, and duration compliance.

Drop your subtitle file here

Supports SubRip (.srt) and Advanced Substation Alpha (.ass)

Select File

What you can solve

Why are my long subtitles being flagged even if they stay on screen for a long time?

Subtitle readability depends on the characters-per-second (CPS) density, which measures how fast a viewer must read the text. Even if a subtitle is visible for a long duration, having an excessive amount of text in that timeframe forces a high reading speed that violates professional accessibility standards.

How can I prevent timing overlaps in my subtitles?

Timing overlaps often occur when one cue ends after the next one begins, causing text to flicker or disappear prematurely. This tool flags these occurrences by checking the end time of one cue against the start time of the next to ensure a clean transition between lines.

What is the ideal line length for web-based subtitles?

Professional standards typically cap lines at 42 characters to prevent eyes from scanning too far across the screen. Lines exceeding this limit are harder to read while watching the video, and this auditor helps enforce this limit to maintain consistent visual comfort.

Why does my subtitle file report an error for short duration cues?

Cues that appear for less than 0.8 seconds are often too fast for the human eye to process comfortably. The auditor highlights these short intervals so you can extend the duration or merge them with adjacent cues for smoother viewing.

Is there a way to handle subtitles with multiple lines?

High-quality subtitles rarely exceed two lines to avoid blocking too much of the screen area. This tool checks for lines-per-cue violations, alerting you whenever a caption block contains three or more lines of text.

Typical workflow

WebVTT to SRT Converter ASS to SRT Subtitle ConverterSubtitle Readability & Compliance AuditorSubtitle Timing Shifter & FPS Converter

Guides for this workflow

Supporting guides that connect this tool to the broader category workflow.

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What is

What is Subtitle Readability & Compliance Auditor?

Ensuring subtitles are readable is critical for viewer accessibility, requiring precise control over character-per-second (CPS) density and display duration. This auditor automatically validates subtitle files against industry-standard benchmarks, flagging issues that hinder viewer comprehension. By enforcing strict constraints on line length and timing, content creators can deliver professional-grade localized subtitles that are easy to follow.

How to use

How to use Subtitle Readability & Compliance Auditor

Upload your SRT or ASS subtitle file to begin the automated compliance analysis. The tool parses the text and displays a summary of findings, highlighting specific cues that violate your chosen CPS, duration, or line length settings. You can adjust these parameters in the settings panel to match specific delivery requirements and then export a full text report of all detected issues.

Example

1
00:00:01,000 --> 00:00:02,000
This subtitle line is far too long for a standard display.

Output:
[ERROR] Cue #1 @ 00:00:01.000: Characters per second (CPS) too high (Limit: 20) (55.0)
[WARNING] Cue #1 @ 00:00:01.000: Line 1 exceeds max length (42) (55)

Common use cases

1. Validating localized subtitle files against broadcast network delivery specifications.

2. Checking caption files for compliance with international accessibility standards.

3. Identifying high-density text sequences that require splitting for better readability.

4. Detecting timing overlaps between consecutive cues that cause screen flickering.

Frequently asked questions

What file formats are supported for the compliance check?v

This auditor primarily supports standard SRT and ASS subtitle formats. It extracts the timing and text data from these files to perform the calculation against your configured constraints.

Can I adjust the character-per-second (CPS) threshold?v

Yes, the configuration settings allow you to define custom thresholds for CPS, line length, and cue duration. This ensures you can meet specific client requirements rather than relying on one-size-fits-all defaults.

Does this tool fix the subtitle errors automatically?v

No, this tool focuses on identification and reporting to ensure manual quality control over the final content. It highlights the exact cues needing attention so you can adjust them in your preferred text or subtitle editor.