Is my video uploaded anywhere?

No. Whisper (transcription) and FFmpeg (subtitle burning) both run in WebAssembly inside your browser. Nothing leaves your device.

What does "Burn & Download MP4" do?

FFmpeg re-encodes the video with subtitles permanently drawn into the pixels. The output MP4 shows subtitles on any player or device without needing a .srt file.

What fonts are available?

Six presets: Classic (Arial/white), Bold (yellow Impact-style), Neon (cyan glow), Cinema (italic serif), Handwritten (Caveat cursive), and Retro (orange monospace).

How long does burning take?

FFmpeg runs in single-threaded WASM at roughly 1–4× real-time. A 1-minute 720p video takes 1–4 minutes. Progress is shown throughout.

Can I import an SRT file?

Yes — click Import SRT to load subtitles from a file, then choose a style and burn into your video.

All ToolsPricingBlog

All ToolsAI Subtitle Generator

AI Subtitle Generator

Generate subtitles with Whisper AI, choose your font style, then burn into MP4 or export SRT/VTT — entirely in your browser.

FREE

Loading…

Go Pro ↑

Drop your video here

MP4, WebM, MOV, AVI — click to browse

Spoken Language

🎬

100% Private

Video never leaves your device

🌍

99+ Languages

Auto-detect or pick your language

🔥

Burn into MP4

Hard subs via FFmpeg WASM

Your files never leave your device. All processing happens locally in your browser — nothing is uploaded to our servers.Files are never stored on our servers · No tracking of your file contentsPrivacy Policy

What is AI Subtitle Generator?

Generate subtitles from any video with Whisper AI running entirely in your browser — no upload, no API key. Choose your font style, edit the subtitles, then download a clean SRT/VTT file or permanently burn the subtitles into an MP4 with FFmpeg WASM.

How It Works

Upload a video. The browser extracts audio and sends it through the Whisper ASR model (WebAssembly). Timestamped subtitles are generated locally. Choose a font style (Classic, Bold, Neon, Cinema, Handwritten, Retro), set the position, edit any lines, then export — either as a subtitle file or as a new MP4 with subtitles baked in.

How to Use

1
Upload your video
Drop an MP4 or WebM file onto the upload area, or click to browse.
2
Generate subtitles
Select the spoken language and click Generate. Whisper AI transcribes the audio in your browser.
3
Choose a font style
Pick from Classic, Bold, Neon, Cinema, Handwritten, or Retro. See the live preview on the video.
4
Edit
Click any subtitle line to correct errors. Click a timestamp to seek to that point.
5
Download
Export SRT/VTT for soft subs, or click Burn & Download MP4 to permanently embed them.

Also Try

Trim Video Compress Video Extract Audio Scan to Text

Key Benefits

100% private — video never leaves your device
OpenAI Whisper AI — 99+ languages, auto-detection
Burn into MP4 via FFmpeg WASM — works on any player
6 font styles: Classic, Bold, Neon, Cinema, Handwritten, Retro
Live subtitle overlay preview while video plays
Interactive timeline — click to seek
Edit subtitles before downloading
Import existing SRT files and re-style or re-burn

Frequently Asked Questions

Related Tools

Background Remover

Remove image backgrounds instantly using AI. Free, private, and 100% browser-based.

AI Trend Intelligence

Discover viral trends across 8 platforms — Google, YouTube, Reddit, Twitter & more. AI generates top 15 hooks, reel scripts, and content ideas instantly.

PDF Summarizer

Upload a PDF and get an AI-generated summary or ask questions about the content — like ChatGPT for your documents.

AI Resume Builder

Build or improve your resume with AI. Get ATS score, fix keyword gaps, implement all improvements in one click, or generate a tailored CV from a job description.

AI Keyword Research

Enter any topic and get AI-powered keyword research: search volumes, difficulty scores, long-tail keywords, questions, content ideas, and topic clusters.

Trusted Worldwide

Free Online Document Tools for Everyone

iLoveDocsTools is used by students, professionals, and businesses across the United States, Canada, United Kingdom, Australia, India, and more than 100 other countries. All tools are browser-based and process files privately — your files never leave your device. Free to use, with Pro plans for unlimited access.

No Upload Required

All processing happens directly in your browser. Your documents are never sent to any server — complete privacy guaranteed for users in the USA, Canada, UK, and worldwide.

Free to Use — Pro Plans Available

Every tool on iLoveDocsTools is free to use. Need more? Upgrade to Pro for unlimited usage, priority access, and no daily limits. Trusted by students, freelancers, and teams across North America and Europe.

Works on Any Device

Whether you are on a Mac, Windows PC, iPhone, or Android in New York, Toronto, London, or Sydney — our tools work instantly in any modern browser.

Looking for free PDF tools in the USA? Free document converters in Canada? Online PDF editors in the UK or Australia? iLoveDocsTools offers 70+ free tools — merge PDF, split PDF, compress PDF, convert Word to PDF, Excel to PDF, JPG to PDF, and many more — all free, all instant, all private. No watermarks. No file size limits. Just free tools that work.