Media
Subtitle Reading Speed & Localization Auditor
Audit SRT, WebVTT, and ASS subtitles for CPS, duration, line length, overlaps, and translation expansion risk.
html· HTML resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/subtitle-reading-speed-localization-auditor' \
-H 'Content-Type: application/json' \
-d '{"filename":"subtitleFile.ext","contentType":"application/octet-stream","size":12345}'
# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
--data-binary @/path/to/file.ext
# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/subtitle-reading-speed-localization-auditor' \
-F 'subtitleText=1
00:00:00,000 --> 00:00:02,000
Welcome to the lesson
2
00:00:02,000 --> 00:00:03,000
This sentence is intentionally too fast.' \
-F 'subtitleFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
-F 'inputFormat=srt' \
-F 'preset=netflix-adult' \
-F 'maxCps=20' \
-F 'maxLineLength=42' \
-F 'maxLines=2' \
-F 'translationExpansionPercent=20'