字幕AIをプロのように使いこなす方法（2026年版ガイド）

執筆者ファヒム・ジョハルダー | Last updated Aug 21, 2026

クイックスタート

このガイドでは、キャプションAIのすべての機能について説明します。

はじめる — アカウントを作成してアプリを設定する
AIクリエイターの使い方 — Turn a script into a talking-head video in minutes
AI Shortsの使い方 — Slice long videos into ready-to-post short clips
AI編集の使い方 — Edit video by editing the transcript text
AIツインズの使い方 — Clone your face and voice for hands-free filming
動画カスタマイズの使い方 — Match caption fonts and colors to your brand
AIアバタージェネレーターの使い方 — Build a custom presenter from a text prompt
AIアイコンタクトの使い方 — Correct your gaze when you read from a script
背景ノイズ除去ツールの使い方 — Clean up messy audio without re-recording
自動字幕の使い方 — Add captions automatically and translate them

所要時間： 各作品につき5分

このガイドには以下の内容も含まれています。 プロのヒント | よくある間違い | トラブルシューティング | 価格 | 代替案

このガイドを信頼する理由

I’ve used Captions AI for eight months and tested every feature covered here.

This tutorial comes from real projects — not marketing copy or vendor screenshots.

Captions AI is one of the most popular AI video editing apps available today.

But most people only ever touch auto-captions and stop there.

Captions make videos more engaging for viewers watching with the sound off.

Creating a finished clip here takes minutes, not an afternoon.

This guide shows you how to use Captions AI end to end.

スクリーンショットとプロのアドバイスを交えながら、手順を一つずつ解説します。

キャプションAIチュートリアル

This How to Use Captions AI tutorial walks through every feature in order.

It starts at your first upload and ends at export.

キャプションAI

Record, edit, and caption video in one app. Captions AI writes your subtitles, cuts the filler words, and translates clips into multiple languages. Start free — no editing experience needed.

今すぐキャプションAIを試してみよう →

レビュー全文を読む →

字幕AIの代替案 →

キャプションAI入門

機能を使用する前に、この初回設定を完了してください。

約3分かかります。

Here’s what the app looked like on my first project:

それでは、各ステップを順を追って見ていきましょう。

ステップ1：アカウントを作成する

Go to the Captions AI Webサイト and click サインアップ.

メールアドレスを入力し、パスワードを選択してください。

✓ チェックポイント: A confirmation message lands in your 受信トレイ.

ステップ2：アプリをダウンロードまたはアクセスする

Captions AI runs on iOS, Android, and any desktop browser.

Install the mobile app if you film on your phone.

✓ チェックポイント: You can see the 作成する button on screen.

ステップ3：初期設定を完了する

Pick your main language and your usual video format.

Then set your default caption style in settings.

✅ 完了: これで、以下のすべての機能をご利用いただけます。

今すぐCaptions AIを試す

How to Use Captions AI Creators

AIクリエイター lets you turn a script into a finished video using a stock presenter.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the Creators tab

クリック AIクリエイター on the left of the dashboard.

You will see a grid of licensed presenters on screen.

Step 2: Pick a creator and paste your script

Choose a face that fits your audience and your business.

Paste your script into the text box, then select a language.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

ステップ3：生成とレビュー

クリック 生成する and wait while the audio is processed.

Watch the draft, then trim any line that runs long.

✅ 結果: A finished talking-head video with auto-captions burned in.

💡 プロのヒント: Write in short sentences. The AI handles pacing better, and the captions stay under 40 characters per line.

今すぐCaptions AIを試す

How to Use Captions AI Shorts

AIショート lets you cut one long recording into several short clips ready to post.

以下に、その使用方法をステップごとに説明します。

Step 1: Upload your long video

クリック Upload and select a file from your computer.

A podcast, ウェビナー, or interview recording all work here.

Step 2: Let the AI find the hooks

The tool scans your audio and ranks the strongest moments.

Each suggested clip gets a score and a draft caption.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Export the clips you want

Select your favourites, then export each one as a separate file.

✅ 結果: Five to ten vertical clips sized for a YouTube channel or feed.

💡 プロのヒント: Check the first three seconds of every clip. A clean hook matters more than the rest of the edit.

今すぐCaptions AIを試す

How to Use Captions AI Editor

AI編集 lets you edit video by deleting words from the transcript.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the transcript panel

クリック 文字起こし icon beside your project.

Every spoken word appears as editable text.

Step 2: Delete the words you do not want

Clicking a word selects it 即座に議事録に記載されています。

Highlight a filler word, press delete, and the matching frames disappear.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Fix the wording

Correct any name or jargon the AI misheard.

The caption on screen updates as you type.

✅ 結果: An edited cut with no gaps, silences, or stray “um” moments.

💡 プロのヒント: Run a search for “um” and “like” first. Removing those two words alone tightens most recordings by 10%.

今すぐCaptions AIを試す

How to Use Captions AI Twins

AI双子 lets you clone your own face and voice so you can post without filming.

以下に、その使用方法をステップごとに説明します。

Step 1: Record your training clip

Start by following the on-screen prompts and reading the sample text aloud.

Good lighting and clean audio decide how real the twin looks.

Step 2: Wait for training

Your clip is processed in the background, usually within a few hours.

You get a message when the twin is ready.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Type a script and generate

Paste new text and your twin says it in your own voice.

✅ 結果: A reusable digital twin that can create videos from text alone.

💡 プロのヒント: Record your training clip in the same location and lighting you normally film in. The twin blends into your other content.

今すぐCaptions AIを試す

How to Use Captions AI Video Customizer

ビデオのカスタマイズ lets you control how every caption looks so your videos match your brand.

以下に、その使用方法をステップごとに説明します。

Step 1: Open caption settings

Click any caption on the preview to open the style panel.

All the styling elements sit in one place: font, size, and position.

Step 2: Set font, color, and position

Pick a font, then choose high-contrast colors so text stays readable.

Drag the caption box away from platform graphics.

Check how captions display on a phone before you move on.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Save it as a preset

Name the style and save it for your next project.

✅ 結果: A saved caption preset you can apply to every future upload.

💡 プロのヒント: Keep captions to one or two lines. Anything longer forces viewers to read instead of watch.

今すぐCaptions AIを試す

How to Use Captions AI Avatar Generator

AIアバタージェネレータ lets you build a presenter from a prompt and stay off camera.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the avatar generator

クリック 作成する, then choose the avatar option.

Step 2: Describe the presenter you want

Write the age, style, and setting in one line of detail.

The AI returns several options in about a minute.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Attach a voice and script

Select a voice, paste your script, and generate the video.

✅ 結果: An original presenter you can reuse across an entire content series.

💡 プロのヒント: Generate three avatars and test each on one post. Engagement tells you which face your audience trusts.

今すぐCaptions AIを試す

How to Use Captions AI Eye Contact

AIアイコンタクト lets you fix your gaze so you appear to face the camera.

以下に、その使用方法をステップごとに説明します。

Step 1: Upload the clip you read from notes

Any recording where your eyes drift off camera works.

Step 2: Turn on Eye Contact

Find the toggle in the effects panel and switch it on.

The preview shows the corrected gaze straight away.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Adjust the strength

Lower the slider if the effect looks too intense.

✅ 結果: A clip where you appear to hold eye contact with viewers throughout.

💡 プロのヒント: Keep your head still while reading. The effect corrects your eyes, not large head movement.

今すぐCaptions AIを試す

キャプションAI背景ノイズ除去ツールの使い方

背景ノイズ除去 lets you remove hum, traffic, and room echo in one click.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the audio panel

Select your clip, then click the audio tab.

Step 2: Enable noise removal

Toggle it on and let the file process for a few seconds.

Try playing the before and after to compare.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Set the level

Dial it back if your voice starts to sound thin.

✅ 結果: Clean audio that also lifts caption accuracy on the next pass.

💡 プロのヒント: Clean the audio before generating captions. The AI mishears far fewer words when the room noise is gone.

今すぐCaptions AIを試す

字幕AI自動字幕の使い方

自動字幕 lets you add captions to any video automatically and translate them into other languages.

以下に、その使用方法をステップごとに説明します。

Step 1: Import the video

Drop your file into a new project and wait for the transcript.

Adding captions this way takes seconds instead of an hour.

Step 2: Review the caption text

Read every line and fix spelling, names, and punctuation.

Check that each caption appears and leaves in time with the audio.

これがその様子です。

✓ チェックポイント: The preview updates with your changes.

Step 3: Translate and export

Pick extra languages, then export burned-in captions or an SRT file.

Extra languages expand your reach to viewers who never speak English.

✅ 結果: Captions in multiple languages, plus a subtitle file for your YouTube channel.

💡 プロのヒント: Export an SRT alongside the burned-in version. YouTube reads that file as closed captions and indexes the text.

今すぐCaptions AIを試す

キャプションAIのプロ向けヒントとショートカット

After eight months with Captions AI, these are the habits that saved me the most time.

They help you work far more efficiently on every project.

キーボードショートカット

アクション	ショートカット
Play or pause the preview	空間
Split the clip at the playhead	Cmd / Ctrl + B
Undo the last edit	Cmd / Ctrl + Z
Export the current project	Cmd / Ctrl + E

These shortcuts alone cut my editing time roughly in half.

For example, splitting a clip by hand costs three separate clicks.

ほとんどの人が見逃す隠れた機能

ワークスペース: Keep client projects in separate workspaces so brand presets never mix.
Keyword emphasis: Bold one or two words per caption to hold attention on small screens.
Batch translate: Generate the same video in several languages before you publish anything.
講演者ノート： Paste your notes into the script field and the teleprompter reads them back.

Here are the benefits that show up fastest in real work:

今すぐCaptions AIを試す

字幕AIでよくある間違いを避ける方法

Mistake #1: Publishing captions without reading them

❌ 間違い: Trusting the first pass and posting straight to your YouTube channel.

✅ 右: Treat AI captions as a first draft. Fix names, jargon, and punctuation before you publish.

Mistake #2: Cramming too much text on screen

❌ 間違い: Four lines of tiny text sitting over busy graphics.

✅ 右: One or two lines, 37 to 40 characters each, in high-contrast colors.

Mistake #3: Ignoring the accessibility side

❌ 間違い: Burning in captions only, so no subtitle file ever reaches viewers.

✅ 右: Export an SRT too. Closed captions meet WCAG 2.1 and make videos accessible to more people.

今すぐCaptions AIを試す

字幕AIのトラブルシューティング

Problem: Captions are out of sync with the audio

原因： The timeline shifted after you trimmed a clip.

修理： Open the transcript, select the caption, and drag its edge back onto the spoken line.

Problem: Names and technical words come out wrong

原因： The AI misreads jargon, brand names, and strong accents.

修理： Edit the text directly, then add repeat offenders to your custom dictionary.

Problem: Export fails or the file will not upload

原因： The project is too long for your plan, or the render was interrupted.

修理： Trim the video, lower the resolution, and export again on a stable connection.

📌 注記： If none of these help, contact Captions AI support from the settings page.

今すぐCaptions AIを試す

Captions AIとは何ですか？

キャプションAI is an app that records, edits, and captions your video in one place.

Think of it as a studio, an editor, and a subtitle 作家 sharing the same screen.

The team ships a new feature most months, so check the release notes.

こちらの簡単な概要をご覧ください。

主な機能は以下のとおりです。

AIクリエイター： Script-to-video with licensed presenters and voices
AIショート動画： Automatic clip finding for long-form recordings
AI編集： Transcript-based editing that removes filler words
AIツインズ： Face and voice cloning for text-to-video
ビデオのカスタマイズ: Caption styling, presets, and brand controls
AIアバタージェネレーター： Prompt-based custom avatars and voices
AIアイコンタクト： Gaze correction for scripted recordings
背景ノイズ除去ツール： One-click noise and echo removal
自動字幕: Automatic captions, translation, and SRT export

AI captioning works in two passes.

First the app transcribes your audio into text, then it times each caption to the words.

One note on scope: this handles video, not still photos.

Image captioning in AI is a separate job, so use an image tool for that.

詳細なレビューについては、こちらをご覧ください。キャプションAIレビュー.

今すぐCaptions AIを試す

キャプションAIの価格

Here is what Captions AI costs in 2026:

プラン	価格	最適な用途
プロ	月額9.99ドル	Solo creators posting short clips weekly
マックス	月額24.99ドル	Daily posters who need longer exports
規模	月額69.99ドル	Teams running client work in shared workspaces

無料トライアル: Yes — a free tier with watermarked exports and limited credits.

返金保証: No stated refund window, so test on the free tier first.

💰 最もお得な価格: Max at $24.99/month — enough credits to post daily without hitting limits.

今すぐCaptions AIを試す

字幕AIと代替手段の比較

How does Captions AI compare? Here is the competitive landscape:

道具	最適な用途	価格	評価
キャプションAI	Short-form video with captions	月額9.99ドル	⭐ 4.3
ヘイジェン	リアルなAIアバター	月額29ドル	⭐ 4.6
シンセシア	Corporate training video	月額29ドル	⭐ 4.5
ヴィード	Browser video editing	月額12ドル	⭐ 4.4
フリキ	Blog-to-video narration	月額28ドル	⭐ 4.4
スピーチファイ	Voiceover and dubbing	月額24ドル	⭐ 4.3
ヴィドノズ	Free avatar templates	月額17ドル	⭐ 4.2
した	Photo-based presenters	月額5.90ドル	⭐ 4.1

おすすめ商品：

総合ベスト： Captions AI — captions, editing, and export in one app
ベスト予算： D-ID — photo avatars from $5.90 a month
初心者におすすめ： Vidnoz — templates and a generous free tier
ビジネスに最適： Synthesia — training video in 140+ languages

🎯 字幕AIの代替案

字幕AIの代替サービスをお探しですか？おすすめのサービスはこちらです。

🚀 ヘイジェン: Studio-grade avatars and voice cloning for polished business videos.
🏢 シンセシア： Enterprise favourite for training content in 140+ languages.
💼 コロシアン： Built for workplace learning, with quizzes baked into videos.
🎨 ヴィード： Full browser editor with subtitles, brand kits, and screen recording.
🔧 エライ： API-first avatar video, handy if you generate clips programmatically.
💰 ヴィドノズ: Generous free tier and hundreds of templates for casual creators.
⚡ ディープブレイン: Fast real time avatar rendering with strong Korean and English voices.
🔊 シンセシス： Voice-led tool where the audio quality outranks the visuals.
📊 1時間目: Data-driven video at scale for product and support teams.
🧠 した： Animates a single photo into a talking presenter cheaply.
📱 ヴィルボ： ワンダーシェア mobile app for quick avatar clips on the go.
💼 ヴィドヤード： Sales-focused hosting with viewer analytics on every video.
🌟 フリキ: Turns blog posts into narrated video with lifelike voices.
🔒 スピーチファイ： Text-to-speech first, with dubbing and voiceover for long content.
⭐ ビデオ内: Template library plus prompt-to-video for social and ads.
🔥 創造する: Ad-focused, pulling product pages into short video creatives.

全リストについては、こちらをご覧ください。キャプションAIの代替ガイド。

⚔️ 字幕AIの比較

Here is how Captions AI stacks up against each competitor:

キャプションAI vs HeyGen: HeyGen wins on avatar realism. Captions AI wins on price and caption editing.
Captions AI vs Synthesia: Synthesia suits corporate training. Captions AI is faster for social clips.
Captions AI vs Colossyan: Colossyan owns e-learning. Captions AI owns short-form editing.
Captions AI vs Veed: Veed offers a deeper timeline. Captions AI needs fewer clicks to publish.
Captions AI vs Elai: Elai fits developers. Captions AI fits creators editing on a phone.
Captions AI vs Vidnoz: Vidnoz is cheaper free. Captions AI gives cleaner captions and cuts.
Captions AI vs Deepbrain: Deepbrain renders faster. Captions AI handles filler-word editing better.
Captions AI vs Synthesys: Synthesys leads on voice. Captions AI leads on the finished video.
Captions AI vs Hour One: Hour One scales enterprise volume. Captions AI scales solo output.
Captions AI vs D-ID: D-ID is cheapest for photo avatars. Captions AI does the full edit.
Captions AI vs Virbo: Virbo is mobile-first. Captions AI covers desktop and mobile workflows.
Captions AI vs Vidyard: Vidyard hosts and tracks. Captions AI creates and captions.
Captions AI vs Fliki: Fliki converts articles well. Captions AI converts raw recordings better.
Captions AI vs Speechify: Speechify wins on narration. Captions AI wins on on-screen captions.
Captions AI vs Invideo: Invideo has more templates. Captions AI has smarter auto-captions.
Captions AI vs Creatify: Creatify targets paid ads. Captions AI targets organic content.

今すぐCaptions AIを試す

今すぐ字幕AIを使い始めましょう

あなたは、キャプションAIの主要な機能をすべて使いこなせるようになりました。

✅ AIクリエイター
✅ AIショート
✅ AI編集
✅ AIツインズ
✅ 動画のカスタマイズ
✅ AIアバタージェネレーター
✅ AIアイコンタクト
✅ 背景ノイズ除去
✅ 自動字幕

次のステップ： どれか一つの機能を選んで、今すぐ試してみてください。

ほとんどの人は自動字幕機能から始めます。

5分もかかりません。

今すぐCaptions AIを試す

よくある質問

字幕作成に最適なAIは何ですか？

Captions AI leads for social video because recording, editing, and captions live in one app. Veed and Fliki suit longer videos that need separate subtitle files.

captions.aiは無料ですか？

You can try Captions AI free with watermarked exports and limited credits. Paid plans start at $9.99/month for Pro, which removes the watermark and unlocks longer clips.

AIを使って字幕を作成する方法は？

Upload your recording and let the AI process the audio. Then edit the wording in the text panel, adjust the timing, and publish.

字幕を作成するAIとは何ですか？

Captions AI generates subtitles from your audio automatically. It supports multiple languages, so one video can reach more people without any manual transcription.

字幕生成AIは機能するのか？

Yes, with review. Accuracy stays high on clear audio. Names, jargon, and heavy accents still need a manual check before you publish.