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SubAlign

Private subtitle toolkit

Sync and fix your subtitles, right in the browser.

Sync out-of-sync subtitles, then convert, rescale, repair and clean them up in seconds. Free, private and entirely in your browser. Nothing is ever uploaded.

Sync subtitles See all tools

Every subtitle tool, in one place

Pick a task. Each tool does one thing well.

Format Converter Convert between SRT, VTT and ASS/SSA in one click. Offset Shifter Move every subtitle earlier or later by a set number of seconds. Framerate Converter Fix PAL/NTSC speed drift by rescaling timings between frame rates. Encoding Repair Repair garbled accents and mojibake by re-decoding to UTF-8. Merge & Split Join multi-part subtitles or split one file in two. Cleanup Tools Strip SDH tags, remove formatting, and check reading speed (CPS).

How it works

1

Drop your file

Drag in an SRT, VTT or ASS/SSA file, or click to browse. It loads instantly.

2

Make the fix

Convert, re-time, rescale, repair encoding or clean up. The result previews as you go.

3

Download

Save the finished subtitles in the format you need. Nothing is ever uploaded.

How to sync subtitles in any player

Step-by-step instructions for fixing out-of-sync subtitles in the apps people use most.

VL VLC How to sync subtitles in VLC Media Player MX MX Player How to sync subtitles in MX Player MP MPC-HC How to sync subtitles in MPC-HC / MPC-BE St Stremio How to sync subtitles in Stremio Po Popcorn Time How to sync subtitles in Popcorn Time Je Jellyfin How to sync subtitles in Jellyfin Wi Windows Media Player How to sync subtitles in Windows Media Player Mo Movies & TV How to sync subtitles in Movies & TV (Windows) Yo YouTube How to sync subtitles in YouTube Pr Prime Video How to sync subtitles in Amazon Prime Video Hu Hulu How to sync subtitles in Hulu

Questions, answered

Are SubAlign’s subtitle tools free?

Yes. Every tool is completely free with no sign-up and no usage limits. The tools are free to run because the processing happens on your own device rather than on a server.

Do my subtitle files get uploaded anywhere?

No. All processing happens locally in your browser. Your files never leave your device, which is also why the tools are free to run.

Which subtitle formats does SubAlign support?

SubAlign reads and writes SubRip (.srt), WebVTT (.vtt) and Advanced SubStation (.ass/.ssa) across every tool.

Do I need to install anything?

No. SubAlign runs in any modern web browser on desktop, tablet or mobile. There is nothing to download or install.