Merge subtitles into one file

How it works

1. 1

   Add your subtitle files

   Upload or paste two SRT files, and add up to four. They stay on your device.

2. 2

   Style and preview

   Give each track its own color, size, and weight, then scrub the preview to see the merged result.

3. 3

   Download the merged file

   Export one file as SRT, WebVTT, or ASS, ready for any player or to burn into a video.

Bilingual subtitles without a subtitle editor

Dual-language captions are one of the most requested things you cannot do with a plain subtitle file, and they are surprisingly fiddly to make by hand: two files, overlapping timings, and the constant risk of the wrong line landing at the wrong moment. Language learners want the original and a translation on screen together; creators posting to a second market want both audiences reading at once. This tool does the timing work for you, laying every track over a shared timeline and folding overlapping cues into single lines so the result is one clean file, not two fighting for the same seconds.

Because the two languages share the screen, they have to be told apart at a glance, which is what the per-track color and size are for. Put the language you are learning on top in white and the translation below in a smaller, warmer color, and the eye separates them without effort. The live preview renders exactly that arrangement, at the real proportions, so you can settle the design before you export rather than discovering it in a media player afterwards.

Merge subtitle files privately, in your browser

A subtitle file is a full transcript of everything said in a video, so it is worth being careful about where it goes. Here the files are read from your disk and merged on your own machine; nothing is uploaded, nothing is kept, and the output has no watermark. That also makes it fast, since there is no round trip to a server, and it keeps working with the tab offline once the page has loaded.

Export in the format that fits where the file is going. SRT is the universal default and every player understands it. WebVTT is the web's format and preserves size and color faithfully in browsers and HTML5 players. ASS is the choice when exact font sizes, colors, and line stacking have to survive, which is why editors and desktop players prefer it. And when you are merging the captions of clips you joined end to end rather than overlaying languages, switch to sequential mode and use each track's shift to slide it to the point where its clip begins.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

What does merging subtitles do?

It combines several subtitle files into one. Overlay mode shows every track at the same time, the usual way to make bilingual, dual-language captions. Sequential mode places one track after another, which is what you want when you have joined two clips and need their captions back to back.

Can I make bilingual, dual-language subtitles?

Yes. Load one language into the first track and the other into the second, keep the mode on Show together, and give each its own color and size so viewers can tell them apart. The preview shows exactly how the two lines stack.

Which format should I export?

SRT is the universal choice and carries color plus bold and italic. WebVTT is best for the web and keeps size and color precisely. ASS is the one to pick when exact font sizes and stacking matter, for players and editors that support it.

My two files are out of sync. Can I fix that?

Each track has a shift control. Nudge one track forward or back in seconds until the lines line up in the preview, and the shift is applied when you export.

Do my subtitle files get uploaded?

No. The files are read and merged in your browser. Nothing is uploaded, nothing is stored, and there is no watermark.

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