What subtitle formats does the auditor support?

The tool supports SRT, WebVTT, and ASS subtitle formats, which can be auto-detected or manually selected.

What is CPS and why does it matter?

CPS stands for Characters Per Second. It measures reading speed to ensure viewers have enough time to read each subtitle cue before it disappears.

How does the translation expansion risk calculation work?

It simulates how much the text length might grow when translated (e.g., by 20%) and flags cues that would exceed CPS limits after expansion.

Are the Netflix and EBU presets official certifications?

No, they are practical QA profiles modeled after industry guidelines to help you align with their workflows, not official certifications.

Can I set custom limits for my subtitle audit?

Yes, you can select the 'Custom' preset to manually define your own maximum CPS, line length, line count, and expansion risk percentage.

Elysia Tools

Navigation

Media

Subtitle Reading Speed & Localization Auditor

Audit SRT, WebVTT, and ASS subtitles for CPS, duration, line length, overlaps, and translation expansion risk.

Details

What this tool helps you do

Reports per-cue characters per second, line limits, line count, and a projected reading-speed risk when translated text expands. Netflix-style presets are practical QA profiles; the EBU preset is an EBU-oriented workflow profile, not a certification.

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

1 examples

Audit a two-cue SRT before localization

Checks a short SRT against a Netflix adult profile and projects a 20% translation expansion.

<article><h2>2 cues audited</h2><p>Per-cue CPS, line limits, and projected localization risk.</p></article>

Inputs

Set the required fields, then run the tool.

8 options

FilesUpload source files for this workflow.1

Subtitle filefileOptional

Single file max size: 20 MBSupported types: text/*, application/x-subrip, .srt, .vtt, .ass

ContentPaste or type the main input values.1

Subtitle texttextareaOptional

SettingsAdjust formats, ranges, numbers, and modes.6

Input formatselectOptionalPresetselectOptionalMaximum CPSnumberOptionalMaximum line lengthnumberOptionalMaximum linesnumberOptionalTranslation expansion risk (%)numberOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

Subtitle Reading Speed & Localization Auditor

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

Continue with connected tools and hubs

Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Netflix Compliance Check for English SRT

2. Localization Risk Assessment for German Translation

FAQ

SRT Subtitle Samples

ASS Subtitle Samples

VTT Subtitle Samples

Copyright-Free MP3 Audio Samples

Audio Read-Along Cue Generator

Stream Probe Report

Video Subtitle Translator

Audio Caption Sync Checker

Text Extraction Tools

Text Case, Encoding, and Normalization Conversion Tools

Text Tools

Text Analysis, Readability, and Content Inspection Tools