TL;DR: To add bilingual (dual-language) subtitles to a video on Mac, you do three things — get the subtitles (extract existing hardcoded subtitles with OCR, or transcribe the audio), translate them while keeping the original text, and burn both lines into the video. GeekLink does all three in one Mac app and exports a finished, ready-to-post video with the source language on top and the translation below. Everything runs locally on your Mac — the video is never uploaded.
What are bilingual subtitles, and why burn them in?
Bilingual subtitles (also called dual-language subtitles) show two languages at once — typically the original spoken language on one line and a translation on the other. They are popular for language learning, reaction and commentary videos, and for re-sharing foreign-language content to a new audience that wants both the original and the translation.
There are two ways to attach subtitles to a video:
- Soft subtitles — a separate file (SRT, ASS, VTT) the player overlays. Viewers can toggle them on or off.
- Burned-in (hardcoded) subtitles — the text is rendered directly into the video frames, so it always shows and cannot be turned off.
Most social platforms — TikTok, Instagram Reels, YouTube Shorts, and many others — do not let you upload a separate SRT for short-form video, so the subtitles have to be burned into the picture. That is why "add subtitles to a video" almost always means burning them in for creators who post to these platforms. Bilingual subtitles make this especially important: you want both lines baked in, styled, and aligned.
How to add bilingual subtitles to a video on Mac (step by step)
The following uses GeekLink, a macOS-native subtitle tool that handles the whole pipeline — extraction, transcription, translation, and burn-in — in one app. It has a free tier you can try first (free-tier OCR is limited to the first 5 minutes).
Step 1 — Import the video. Drag your video into GeekLink.
Step 2 — Get the subtitles.
- If the video already has hardcoded subtitles, use OCR to read them into an editable SRT. Select the region where the subtitles sit — GeekLink lets you target the top or bottom portion of the frame, so for vertical videos with captions in the upper or middle area, switch the recognition region accordingly (the default targets the lower portion).
- If the video has no subtitles, use AI speech recognition to generate them from the audio (90+ languages supported).
Step 3 — Translate and keep both languages. Run AI translation (GPT-4o, Claude, or DeepSeek) into your target language, and keep the original text alongside the translation to produce bilingual subtitles.
Step 4 — Burn in and export. Set the font, size, and position for each language line, then burn the bilingual subtitles into the video and export a finished file you can upload directly.
The whole flow stays in one Mac app: extract or transcribe → translate → burn in. No juggling separate tools, and the video never leaves your computer.
Already-subtitled video vs. no subtitles: which path?
| Your source video | First step | Notes |
|---|---|---|
| Has burned-in (hardcoded) subtitles | OCR extraction | Pick the correct region (top/bottom); proofread stylized or outlined text |
| No subtitles at all | AI speech recognition | Review the output when there's heavy background music or strong accents |
| Already has an SRT/ASS file | Import directly | Skip straight to translate + burn-in |
Tips for clean bilingual burn-in
- Set the recognition region first. For vertical videos, captions are often in the middle or top — switch the region from the default lower portion to the upper portion, or OCR may return nothing.
- Proofread stylized text. Decorative or heavily outlined captions trip up OCR; fix errors before translating so they don't carry into the final video.
- Mind line length on two lines. A long translation can wrap and crowd the frame. Adjust font size and position, and render a short test clip first.
- Remember platforms need burn-in. For short-form video, exporting an SRT isn't enough — the subtitles must be burned into the picture.
- Keep sensitive footage local. Local processing means the video never gets uploaded — useful for unreleased or confidential material.
Frequently Asked Questions
How do I show two languages of subtitles at the same time?
Generate subtitles in the source language (by OCR extraction or speech recognition), translate them while keeping the original text, then burn both lines into the video. GeekLink produces bilingual subtitles with the original and the translation shown together, and exports a finished video.
Can I burn subtitles into a video on a Mac?
Yes. GeekLink runs natively on macOS (optimized for Apple Silicon) and burns subtitles directly into the video, exporting a ready-to-post file. You control the font, size, and position for each language line.
Does the video get uploaded anywhere?
No. OCR and speech recognition run locally on your Mac, so the video never leaves your computer. Only AI translation calls a model online.
What if the video has no subtitles to start with?
Use AI speech recognition to generate subtitles from the audio (90+ languages), then translate and burn them in. The bilingual workflow is the same.
Is it free?
GeekLink has a free tier you can try (free-tier OCR is limited to the first 5 minutes). Full features and pricing are on the official site.