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SubAlign

Private subtitle toolkit

Fix your subtitles, right in the browser.

Convert, re-time, repair and clean up subtitles in seconds. Free, private and entirely in your browser. Nothing is ever uploaded.

Convert a file 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.

Questions, answered

Are SubAlign’s subtitle tools free?

Yes. Every tool is completely free with no sign-up, no usage limits and no ads.

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.