Add your SSA file
Drop one or more .ssa files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
SSA to JSON
Converting a .ssa file to .json extracts the document's content from its office package into a portable form. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop SSA files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting SubStation Alpha subtitles to JSON data
Converting a .ssa file to .json extracts the document's content from its office package into a portable form. An .ssa file is a SubStation Alpha subtitle script — the v4.00 predecessor of Advanced SubStation Alpha. It uses the same [Script Info] / styles / [Events] layout and the same Dialogue timing, with a smaller style table and no v4+ extensions.
A .json file holds JavaScript Object Notation: nested objects, arrays, strings, numbers, booleans, and null written in a strict text syntax. It is the default data language of the web — most APIs speak nothing else. For this route the practical draw is parsers ship in the standard library of essentially every language and readable by humans and machines alike — balanced against no comments — a perpetual annoyance for configuration files, which is worth knowing before you commit a large batch.
Why convert SSA to JSON?
The practical trigger for this conversion is usually a mismatch: with .ssa, superseded by .ass, which every current authoring tool writes instead. Switching to .json buys you parsers ship in the standard library of essentially every language, which is why it is the better fit for rEST and HTTP API request and response payloads. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
SSA vs JSON at a glance
| Aspect | SubStation Alpha subtitles (.ssa) | JSON data (.json) |
|---|---|---|
| Format type | Text-based — characters and structure, so there is no visual quality loss | Text-based — characters and structure, so there is no visual quality loss |
| How it stores data | the [V4 Styles] section uses TertiaryColour and AlphaLevel fields that the later [V4+ Styles] table replaced | exactly six value types; no dates, no comments, no trailing commas — the strictness is deliberate |
| Strongest at | reading subtitle scripts from late-1990s and early-2000s releases | rEST and HTTP API request and response payloads |
| Weak spot | superseded by .ass, which every current authoring tool writes instead | no comments — a perpetual annoyance for configuration files |
Pick JSON as the output
Select .json in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if JSON is selectable, the route is real and validated.
Convert on your device
Press Convert. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid JSON file. Outputs keep the original filename with the .json extension.
SSA to JSON questions, answered
Will converting SSA to JSON lose quality?
There is no visual quality to lose — ssa is text-oriented and json is text-oriented, so the question is structural fidelity. Text, ordering, and basic structure are preserved; complex layout, embedded objects, and styling beyond the target's model are simplified.
Is it private to convert SSA files here?
Yes — the .ssa file is processed inside your browser tab and never uploaded. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded. Close the tab and the file is gone from memory.
Where will the JSON file work?
Browsers parse it natively through JSON.parse, every mainstream language bundles support, and most editors validate and highlight it out of the box. Viewing a raw .json file is possible in any text editor or browser tab.
Will the JSON file be bigger or smaller than my SSA?
It depends on the content: exactly six value types; no dates, no comments, no trailing commas — the strictness is deliberate. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my SSA file?
In .ssa, the v4 style table and script headers describe presentation only; timing and text survive conversion, styling does not. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.