JSON to SRT Subtitle Converter

Quickly convert Structured JSON subtitles to SubRip Subtitle locally in your browser. Timelines and subtitle content are never uploaded.

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What happens when converting JSON to SRT?

Structured JSON content is parsed into a unified millisecond timeline before being exported as SubRip Subtitle. Valid timing and subtitle text are preserved.

SRT output creates numbered subtitle blocks and uses comma-separated millisecond timestamps.

JSON input supports an array of subtitles or an object containing a cues or subtitles array.

Format overview

About JSON and SRT subtitle formats

Learn what each file format is, how it is structured, where it is commonly used, and what to consider during conversion.

Source file format

JSON · Structured JSON

JSON, or JavaScript Object Notation, is a structured data-interchange format rather than one industry-standard subtitle specification. Explicit fields can represent timing, text, and extensible metadata.

File structure: This tool uses a JSON object containing a cues array. Each cue has start_ms, end_ms, and text fields representing the start time, end time, and subtitle text.
Common uses: JSON is useful for subtitle software development, API exchange, batch processing, data analysis, automation, and preserving structured subtitle data for later programmatic or AI processing.
Conversion notes: Subtitle JSON schemas vary between applications. This tool can read subtitle arrays and objects containing cues or subtitles arrays, and it exports a consistent cues structure.

Target file format

SRT · SubRip Subtitle

SRT, short for SubRip Subtitle, is a simple, open, and highly compatible text subtitle format. It is one of the most common interchange formats used by video players, editors, and online video platforms.

File structure: An SRT file contains sequentially numbered cue blocks. Each block has an index, a start and end timestamp separated by an arrow, and one or more lines of subtitle text. Milliseconds normally use a comma separator.
Common uses: SRT is commonly used for movies, video editing imports and exports, online video uploads, and exchanging subtitle timing and text between applications.
Conversion notes: SRT primarily stores text and timing. It is not designed for complex positioning, typography, or animation, so advanced ASS or SSA styling is normally lost when converting to SRT.