Convert, clean, retime and validate SRT, WebVTT, ASS/SSA, SBV and TTML subtitles. 8 tools.
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Audit subtitle readability and produce a report: reading speed (CPS), cue durations that are too short or too long, lines that are too wide, more than two lines, and overlapping cues. Returns a formatted report listing every flagged cue.
The full subtitle file text.
Max characters per second. Default 20.
Max characters per line. Default 42.
Maximum cue duration in seconds. Default 7.
Minimum cue duration in seconds. Default 0.833 (Netflix 5/6s).
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Audit subtitle readability and produce a report: reading speed (CPS), cue durations that are too short or too long, lines that are too wide, more than two lines, and overlapping cues. Returns a formatted report listing every flagged cue.
| Argument | Type | Description |
|---|---|---|
| content* | string | The full subtitle file text. |
| max_cps | number | Max characters per second. Default 20. |
| max_line_length | number | Max characters per line. Default 42. |
| max_duration_seconds | number | Maximum cue duration in seconds. Default 7. |
| min_duration_seconds | number | Minimum cue duration in seconds. Default 0.833 (Netflix 5/6s). |
{
"type": "object",
"required": [
"content"
],
"properties": {
"content": {
"type": "string",
"description": "The full subtitle file text."
},
"max_cps": {
"type": "number",
"description": "Max characters per second. Default 20."
},
"max_line_length": {
"type": "number",
"description": "Max characters per line. Default 42."
},
"max_duration_seconds": {
"type": "number",
"description": "Maximum cue duration in seconds. Default 7."
},
"min_duration_seconds": {
"type": "number",
"description": "Minimum cue duration in seconds. Default 0.833 (Netflix 5/6s)."
}
}
}Strip noise from auto-generated subtitles: HTML/WebVTT tags, ASS override codes, music and sound-effect cues, speaker labels, empty cues and duplicate lines. Returns the subtitle file in SRT or WebVTT.
| Argument | Type | Description |
|---|---|---|
| to | string | Output format. Default: same as the input. |
| content* | string | The full subtitle file text. |
| drop_empty | boolean | Drop cues that become empty after cleaning. Default true. |
| remove_tags | boolean | Strip HTML/WebVTT tags and ASS override codes. Default true. |
| drop_duplicates | boolean | Drop cues whose text was already seen. Default false. |
| remove_sound_cues | boolean | Strip [Music], [Applause], ♪ ... ♪ and similar. Default true. |
| remove_speaker_labels | boolean | Strip leading "SPEAKER:" prefixes. Default false — enable only if you want them gone. |
{
"type": "object",
"required": [
"content"
],
"properties": {
"to": {
"enum": [
"srt",
"vtt"
],
"type": "string",
"description": "Output format. Default: same as the input."
},
"content": {
"type": "string",
"description": "The full subtitle file text."
},
"drop_empty": {
"type": "boolean",
"description": "Drop cues that become empty after cleaning. Default true."
},
"remove_tags": {
"type": "boolean",
"description": "Strip HTML/WebVTT tags and ASS override codes. Default true."
},
"drop_duplicates": {
"type": "boolean",
"description": "Drop cues whose text was already seen. Default false."
},
"remove_sound_cues": {
"type": "boolean",
"description": "Strip [Music], [Applause], ♪ ... ♪ and similar. Default true."
},
"remove_speaker_labels": {
"type": "boolean",
"description": "Strip leading \"SPEAKER:\" prefixes. Default false — enable only if you want them gone."
}
}
}Convert subtitle text between formats. Reads SRT, WebVTT, ASS/SSA, YouTube SBV and TTML/DFXP; writes SRT, WebVTT, ASS, CSV or plain text. Format is auto-detected unless `from` is given.
| Argument | Type | Description |
|---|---|---|
| to* | string | Target format. `text` = plain transcript, one line per cue, no timecodes. |
| from | string | Source format (default "auto" = detect). |
| dedupe | boolean | Only for to="text": collapse consecutive identical lines (rolling-caption transcripts repeat lines). Default false. |
| content* | string | The full subtitle file text. |
{
"type": "object",
"required": [
"content",
"to"
],
"properties": {
"to": {
"enum": [
"srt",
"vtt",
"ass",
"csv",
"text"
],
"type": "string",
"description": "Target format. `text` = plain transcript, one line per cue, no timecodes."
},
"from": {
"enum": [
"auto",
"srt",
"vtt",
"ass",
"sbv",
"ttml"
],
"type": "string",
"description": "Source format (default \"auto\" = detect)."
},
"dedupe": {
"type": "boolean",
"description": "Only for to=\"text\": collapse consecutive identical lines (rolling-caption transcripts repeat lines). Default false."
},
"content": {
"type": "string",
"description": "The full subtitle file text."
}
}
}Repair mojibake — text where UTF-8 bytes were decoded as a single-byte encoding (cp1252/Latin-1 or cp1251). Symptoms: "é", "’", "привет". Returns the repaired text and how many passes were applied.
| Argument | Type | Description |
|---|---|---|
| twice | boolean | Set true when the text was mis-decoded twice (nested mojibake). Default false. |
| content* | string | The garbled subtitle text. |
| read_as | string | Which encoding the file was wrongly read as. Default "auto" (tries cp1252 then cp1251). |
{
"type": "object",
"required": [
"content"
],
"properties": {
"twice": {
"type": "boolean",
"description": "Set true when the text was mis-decoded twice (nested mojibake). Default false."
},
"content": {
"type": "string",
"description": "The garbled subtitle text."
},
"read_as": {
"enum": [
"auto",
"cp1252",
"cp1251"
],
"type": "string",
"description": "Which encoding the file was wrongly read as. Default \"auto\" (tries cp1252 then cp1251)."
}
}
}Append one subtitle track after another (CD1 + CD2, or a second language track). The second track is offset so it starts after the last cue of the first, plus an optional gap.
| Argument | Type | Description |
|---|---|---|
| to | string | Output format. Default: same as the input. |
| content* | string | The first subtitle file text. |
| gap_seconds | number | Extra gap between the two tracks, in seconds. Default 0. |
| append_content* | string | The subtitle file text to append. |
{
"type": "object",
"required": [
"content",
"append_content"
],
"properties": {
"to": {
"enum": [
"srt",
"vtt"
],
"type": "string",
"description": "Output format. Default: same as the input."
},
"content": {
"type": "string",
"description": "The first subtitle file text."
},
"gap_seconds": {
"type": "number",
"description": "Extra gap between the two tracks, in seconds. Default 0."
},
"append_content": {
"type": "string",
"description": "The subtitle file text to append."
}
}
}Fix subtitle timing. Use offset_seconds for a uniform shift (whole track early/late). Use ratio, or from_fps/to_fps, for progressive drift caused by a frame-rate mismatch. Pass exactly one of the three.
| Argument | Type | Description |
|---|---|---|
| ratio | number | Scale all timings by this factor (new = old x ratio). e.g. 1.0427 for a 25→23.976 fps fix. |
| to_fps | number | The frame rate of the actual video (used with from_fps). |
| content* | string | The full subtitle file text. |
| from_fps | number | The frame rate the subtitles were authored for (used with to_fps). |
| offset_seconds | number | Shift every cue by this many seconds. Negative = earlier. e.g. -2.5 |
{
"type": "object",
"required": [
"content"
],
"properties": {
"ratio": {
"type": "number",
"description": "Scale all timings by this factor (new = old x ratio). e.g. 1.0427 for a 25→23.976 fps fix."
},
"to_fps": {
"type": "number",
"description": "The frame rate of the actual video (used with from_fps)."
},
"content": {
"type": "string",
"description": "The full subtitle file text."
},
"from_fps": {
"type": "number",
"description": "The frame rate the subtitles were authored for (used with to_fps)."
},
"offset_seconds": {
"type": "number",
"description": "Shift every cue by this many seconds. Negative = earlier. e.g. -2.5"
}
}
}Split one subtitle track into two parts at a given timecode, keeping original timecodes. Use the `at` argument plus `part` to fetch either half.
| Argument | Type | Description |
|---|---|---|
| at* | string | Split point. Accepts "45:00", "1:02:03", "90" (seconds) or "1:02:03.500". |
| to | string | Output format. Default: same as the input. |
| part | string | Which half to return. Default "a" (before the split point). |
| content* | string | The full subtitle file text. |
{
"type": "object",
"required": [
"content",
"at"
],
"properties": {
"at": {
"type": "string",
"description": "Split point. Accepts \"45:00\", \"1:02:03\", \"90\" (seconds) or \"1:02:03.500\"."
},
"to": {
"enum": [
"srt",
"vtt"
],
"type": "string",
"description": "Output format. Default: same as the input."
},
"part": {
"enum": [
"a",
"b"
],
"type": "string",
"description": "Which half to return. Default \"a\" (before the split point)."
},
"content": {
"type": "string",
"description": "The full subtitle file text."
}
}
}Turn a plain transcript (one line per caption) into an SRT file with evenly spaced timecodes. Timing is a starting point, not a real transcription — say so when you present the result.
| Argument | Type | Description |
|---|---|---|
| content* | string | Plain text, one caption per line. Blank lines are skipped. |
| start_seconds | number | Timecode of the first cue, in seconds. Default 0. |
| duration_seconds | number | Seconds each cue stays on screen. Default 2.5. |
| max_chars_per_cue | number | Split longer lines into several cues at word boundaries. Default 0 = never split. |
{
"type": "object",
"required": [
"content"
],
"properties": {
"content": {
"type": "string",
"description": "Plain text, one caption per line. Blank lines are skipped."
},
"start_seconds": {
"type": "number",
"description": "Timecode of the first cue, in seconds. Default 0."
},
"duration_seconds": {
"type": "number",
"description": "Seconds each cue stays on screen. Default 2.5."
},
"max_chars_per_cue": {
"type": "number",
"description": "Split longer lines into several cues at word boundaries. Default 0 = never split."
}
}
}