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hussa edited this page Nov 2, 2026
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AutoSync is a Windows program that takes the audio from one version of a video and fits it to the picture of another version, even when the two releases are edited differently. It can also sync subtitles.
No coding is needed: download the Windows portable release, unzip it and run AutoSync.exe.
| Page | Read it when |
|---|---|
| Getting started | You are new: download, add two videos, choose tracks, sync, find the result. |
| Preview & Edit | You want to check a result, listen across joins and fix anything by hand. |
| Censored and edited dubs | Your source is an old dub that removed or re-cut scenes. |
| How syncing works | You want to know what AutoSync does, how accurate it is and where it can go wrong. |
| AI-assisted matching | Optional extra models. Not needed for normal use. |
| Troubleshooting | Something did not work. |
| Subtitle syncing | A separate workflow for subtitles. |
| Term | Meaning |
|---|---|
| Source | The video with the audio you want (for example an old DVD with your language). |
| Target | The video whose picture you want to keep (for example a newer Blu-ray). |
| Output | A new synced audio file (FLAC), and in some modes an edited video. Your original files are never changed. |
Keep your videos wherever you like; you do not need special folders.
- Much more accurate. AutoSync now matches the source audio to the target's picture. Earlier versions followed the target's own dub track, which is often 90–250 ms off its own picture. Checked on 8 real episode pairs in every mode: typical error 9–17 ms, 64 of 64 runs pass. See How syncing works.
- Handles messy edits: re-cut and reordered shots, added or removed scenes, frozen shots held longer, slow picture drift, different playback speeds.
- Censored or edited dubs: restore or cut every scene a dub removed, scene by scene. See Censored and edited dubs.
- Redesigned Preview & Edit: everything on one screen with a review list of every join. See Preview & Edit.
- Cleaner main window: your files on the left, the job settings on the right, one bar at the bottom that tells you the next step.
| Output | Use it when |
|---|---|
| Full target audio | Best first try. Syncs audio to the whole target; exports FLAC. |
| Main episode only | The releases have different openings/endings and you want only the episode; exports video + FLAC. |
| Keep opening & ending | Keep the target's own opening/ending audio and sync the episode in between. |
Matching method is a separate choice. Standard is the default and needs nothing extra; AI-assisted is optional (see its page).
Always listen across flagged joins before using a result. AutoSync marks anything it is unsure about.
AutoSync by EVA0111 · Download · Report a problem