Cycling through all six. Tap any point to stop.

Measured on six things

Free browser-based AI auto subtitle and caption generator

Security

HTTPS and HSTS are in place and video stays local, but the header probe found no CSP, no frame protection, no DMARC, and only 5/12 checklist points. No SOC 2 or audit claim published.

Screenshots

1 / 1

Auto Subtitles

About this app

Auto Subtitles is a browser-based caption studio that turns raw video into fully styled, word-synced subtitles in minutes—no installation or account required. You drop in an MP4, MOV, or WebM file, and its AI speech-to-text engine auto-detects over 100 languages, aligning every word to the millisecond. From there, you can edit the transcript inline, drag start and end timestamps, split or merge caption blocks, and strip out awkward silences from a full multi-track timeline. Style-wise, there are 28+ animated presets (Karaoke Pop, Hormozi Bold, Neon Pulse, Pill Box, Wave Bounce, and more) with one-click control over fonts, casing, strokes, shadows, and vertical safe-zone positioning—ideal for 9:16 TikTok, Reels, and Shorts. The standout technical choice is local rendering: using HTML5 Canvas and WebCodecs, the app burns captions into your video right on your device, so you skip cloud upload queues while your full footage stays local (only a lightweight audio stream is sent for transc...

Key features

1Word-level AI transcription in 100+ languages with millisecond alignment.
228+ animated caption presets (Karaoke Pop, Hormozi Bold, Neon Pulse, etc.) with full style control.
3Local browser rendering via Canvas/WebCodecs — no cloud upload queue for the video.
4Multi-track timeline editor with inline transcript editing, split/merge, and silence removal.
5SRT/VTT/TXT export and 30+ language AI translation on paid plans.
6No signup required; free tier up to 10 min and watermarked 720p.

Target customer profile

Drawn from the product itself, not from a survey.

Demographic

Short-form video creators on TikTok, Reels & Shorts (18–34)

Pain points

Spending hours hand-timing captions; losing muted-feed viewers in the first seconds

Primary needs

Fast word-by-word animated captions in 9:16 with trendy viral presets

Demographic

YouTubers, podcasters & long-form producers

Pain points

Manual transcription is slow and costly; YouTube needs accurate SRT/VTT files

Primary needs

Accurate transcription and frame-accurate SRT/VTT/TXT exports

Demographic

Global brands & video marketers localizing content

Pain points

Translating ad creatives is expensive; inconsistent brand styling across languages

Primary needs

AI subtitle translation into 30+ languages with locked brand fonts and layout

Demographic

Educators & online course creators

Pain points

Accessibility compliance is tedious; lecture captions require lots of cleanup

Primary needs

Readable caption templates, inline transcript edits, and quick browser rendering

Scout Review

Written by AI from measured evidence, scored out of 100.

Auto Subtitles is a browser-based caption studio that does the hard part well: word-synced transcription, 28+ animated presets, and local rendering that keeps your footage off someone else's server. The pricing is creator-friendly ($9 Pro, $15 Max) and the free tier is genuinely usable. The problems are polish and trust: the homepage opens on an empty editor, accessibility has real gaps, and the security headers are half-finished. It's a promising tool with a clear wedge, but it needs to look and feel as finished as it actually is.

Measure by measure

Usability

No signup, a demo video, and a repeated Upload button make the first step obvious. But free-tier limits hide in tiny text and the dense timeline/export controls will slow newcomers down.

Design

Cohesive dark theme with one orange accent and genuinely well-crafted caption style tiles. But the homepage opens on an empty black editor canvas with no hero or sample, so first impression is a void.

Speed

Lighthouse mobile 86/100 and desktop 97/100, with CLS 0 and FCP 1.1s. Local Canvas/WebCodecs rendering skips cloud queues, though a 3.5s mobile LCP drags the first paint.

Security

HTTPS and HSTS are in place and video stays local, but the header probe found no CSP, no frame protection, no DMARC, and only 5/12 checklist points. No SOC 2 or audit claim published.

Accessibility

Lighthouse a11y 91/100, but failing audits include unnamed buttons, insufficient contrast, and out-of-order headings. A language switcher exists; no WCAG statement found.

Growth

Real, crowded category (CapCut, Submagic, Veed) with a genuine wedge: local rendering and no signup. Differentiated enough to compete, but the moat is thin and the domain is brand new.

Improvement areas

Homepage opens on an empty editor canvas — add a sample video or poster frame.
Free-tier limits are buried in tiny grey text — surface them clearly.
Missing security headers (CSP, frame protection, DMARC) and no published audit.
Accessibility gaps: unnamed buttons, contrast failures, and heading order.

Design & Usability

The design language is coherent — dark UI, one orange accent, and a style grid that actually shows off the product's value. The caption preset tiles are the best thing on the page. But the homepage opens on the editor itself with a large empty black canvas and no sample content, so a first-time visitor sees a void instead of a pitch. Usability is decent: no signup, a demo video, and a repeated Upload button make the path clear. The friction is in the details — free-tier limits are buried in tiny grey text, and the dense timeline and export controls will slow down anyone who isn't already a video editor.

Speed & Security

Speed is the strongest measured dimension: Lighthouse mobile 86/100 and desktop 97/100, with CLS 0 and FCP 1.1s. The local Canvas/WebCodecs rendering is a real architectural choice that avoids cloud upload queues, and it shows. The 3.5s mobile LCP is the one blemish. Security is the weak spot: HTTPS and HSTS are enforced, but the header probe found no CSP, no frame protection, no X-Content-Type-Options, no Referrer-Policy, and no DMARC — 5/12 checklist points. No SOC 2, ISO, or audit claim is published, and the privacy story rests on the claim that only a lightweight audio stream leaves the device.

Accessibility & Growth

Accessibility scores 91/100 on Lighthouse, but the failing audits are not trivial: buttons without accessible names, insufficient contrast, non-sequential headings, and visible labels that don't match accessible names. There's a language switcher, but no WCAG statement. Growth is a judgement call: the short-form caption category is real and crowded, with CapCut, Submagic, and Veed as the named alternatives. Auto Subtitles' wedge is local rendering and a no-signup free tier — genuinely different from cloud-based competitors, but a thin moat. The domain was registered in November 2026, so this is very early; the idea has room, but the execution needs to earn its place.

Conclusion

If you're a short-form creator who hates upload queues and wants a no-signup caption tool, this is worth a try. If you're evaluating it for a team or brand, wait for the security and accessibility story to mature. The local-rendering approach is the right bet — now the rest of the product needs to catch up to it.

Suggestions for improvement

Add a sample video or poster frame to the homepage editor so first-time visitors see the product working, not an empty canvas.
Move free-tier limits (10 min, watermarked 720p) out of tiny grey text and into a visible comparison or tooltip.
Ship the missing security headers (CSP, frame protection, X-Content-Type-Options, Referrer-Policy, DMARC) — they're cheap wins.
Fix the failing accessibility audits: accessible names on buttons, contrast ratios, and heading order.

How we score

Alternatives comparison

Named competitors, point by point. Nobody paid to appear here or to be left out.

	Auto Subtitles	CapCut	Submagic	Veed.io
Pricing	Free tier; Pro $9/mo; Max $15/mo	Free with paid Pro tiers	Paid subscription, free trial	Free tier; paid plans for subtitles/translation
No signup required	Yes — start free without an account	No — requires install and account	No — account required	No — account required
Local rendering (no cloud upload)	Yes — Canvas/WebCodecs burns captions on-device	No — desktop/mobile app processing	No — cloud-based	No — cloud-based
Animated caption presets	28+ presets with full style control	Yes — animated text presets	Yes — viral templates and emojis	Yes — subtitle styles
AI subtitle translation	30+ languages on Pro/Max	Limited / not core	Yes — translation available	Yes — translation on paid plans
SRT/VTT export	Yes — on Pro/Max	Yes	Yes	Yes — on paid plans