Subtitle Fixer

A tool for fixing and adjusting .srt and .sub subtitle files. Available as a Windows desktop app and a web app (Docker-ready).

Features

• Shift all subtitles forward or backward by any number of seconds
• Remove entries that become negative after shifting
• Fix timing errors (end time before start time, zero-duration entries)
• Renumber entries sequentially starting from 1
• Preserves original encoding (UTF-8, UTF-16)

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Projects

Project	Description
Prevod	Windows Forms desktop app
PrevodWeb	ASP.NET Core web app
PrevodCore	Shared subtitle processing library

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Getting Started

Prerequisites

• .NET 9 SDK
• Docker (for the web app container)

Run the Windows app

cd Prevod
dotnet run

Run the web app locally

cd PrevodWeb
dotnet run

Then open http://localhost:5388.

Run with Docker

docker compose up -d

Then open http://localhost:5388.

Docker image

https://hub.docker.com/repository/docker/mijalko/subtitle-fixer/general

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Usage

1. Select or drag & drop a .srt or .sub file
2. Enter a time offset in seconds (e.g. -10 to shift 10 seconds earlier, +15 to shift later)
3. Click Fix Subtitles
4. Download the corrected file

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License

This project is licensed under the MIT License. See LICENSE for details.