Pricing

from $20.00 / 1,000 converted subtitle files

Subtitle Converter & Resync — SRT/VTT/ASS

Convert SRT, VTT, ASS/SSA and JSON subtitles, then fix timing with a global offset, framerate conversion or two-point synchronization. Supports batch processing and multiple output formats without third-party APIs.

Pricing

from $20.00 / 1,000 converted subtitle files

Rating

0.0

(0)

Developer

François Fernandez

Actor stats

Bookmarked

Total users

Monthly active users

16 hours ago

Last modified

Categories

Developer tools

Videos

Automation

Paste your subtitles here — easiest option

subtitleText

Optional

Paste the complete contents of one SRT, VTT, ASS/SSA or JSON subtitle file, choose an output format, then run. No upload storage is required.

Type:string

Filename for pasted subtitles

pastedFileName

Optional

Optional output filename stem for Quick input, for example episode-01.srt. Used only when pasted subtitle content is provided.

Type:string

Default:pasted-subtitles.srt

Choose output formats

outputFormats

Optional

One file is written per format. TXT drops all timings and produces a clean transcript.

Type:string[]

Default:

[
  "srt"
]

Select upload storage

subtitleStore

Optional

Required when uploading files: select a Key-Value Store here, then select that exact same store in Step 2. This safely grants read-only access to the uploaded files. Leave empty only when using public direct URLs.

Type:string

Advanced upload — upload files

subtitleFiles

Optional

Upload SRT, VTT, ASS/SSA or JSON files and choose the SAME Key-Value Store as in Step 1. You can upload several files and apply the same conversion and retiming to all of them.

Type:string[]

Max. items:20

Direct subtitle file URLs

subtitleUrls

Optional

Optional direct HTTP(S) download URLs to SRT, VTT, ASS/SSA or JSON files. Not YouTube or TikTok page links. Uploaded files and URLs can be combined in the same run.

Type:string[]

Max. items:20

Global offset (milliseconds)

offsetMs

Optional

Shift every cue. Negative makes subtitles appear EARLIER, positive LATER. Use this when the lag is the same at the start and at the end of the file. If the lag grows over time, it is drift — use the framerate or two-point options instead.

Type:integer

Default:0

Source framerate

sourceFps

Optional

The framerate the subtitles were authored against. Leave empty unless you know it.

Type:string

Default:

Options:

23.976242529.97305059.9460

Target framerate

targetFps

Optional

The framerate of the video you are syncing to. Must be set together with the source framerate.

Type:string

Default:

Options:

23.976242529.97305059.9460

Two-point sync (fixes lag AND drift)

useAnchorSync

Optional

The reliable fix when you do not know the framerates. Give the current and correct timestamps of two lines far apart — ideally the first and the last of the file — and both the constant lag and the progressive drift are solved at once.

Type:boolean

Default:false

First line — current timestamp

anchorObservedA

Optional

As written in the file, e.g. 00:00:04,120. Seconds also accepted.

Type:string

First line — correct timestamp

anchorDesiredA

Optional

When it should actually appear, e.g. 00:00:02,000.

Type:string

Last line — current timestamp

anchorObservedB

Optional

Must be at least 30 seconds after the first anchor, or the computed scale is unreliable.

Type:string

Last line — correct timestamp

anchorDesiredB

Optional

When the last line should actually appear.

Type:string

Drop cues pushed before zero

dropNegativeCues

Optional

Off by default: cues shifted before zero are clamped to 00:00:00, which is what a player does anyway. Turn on when you are trimming a leading section rather than correcting a lag.

Type:boolean

Default:false

Keep line breaks in TXT output

keepLineBreaksInTxt

Optional

Off by default, so each cue becomes one paragraph. Turn on to preserve the original two-line layout.

Type:boolean

Default:false

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