About SubtitleLens

We build translation software — including a Chrome extension for bilingual subtitles used on YouTube, X and Netflix — and we test every tool we review with real subtitle files.

SubtitleLens exists because most "best subtitle tool" lists are written by the tool vendors themselves. We publish two things instead: free tools that run entirely in your browser, and comparisons based on running the same real subtitle files through every tool.

How we test

• Same three test files for every tool: clean tutorial speech, a two-person podcast with crosstalk, and a slang-heavy short.
• We check translation quality, timing fidelity, export formats, real cost per finished minute, and what the free tier actually allows.
• Claims we have not verified ourselves are labeled as vendor claims.
• Every comparison page shows its last-updated date.

Affiliate disclosure

Some outbound links are affiliate links: if you buy through them, the vendor pays us a commission at no extra cost to you. Programs never influence rankings — several tools we recommend most strongly pay us nothing, and our top recommendation for most readers is our own free tool, which earns us nothing at all.

Privacy

The free tools on this site process files entirely in your browser. Your subtitle files are never uploaded to our servers. Translation requests go directly from your browser to the translation engine.

Questions or corrections: contact — The SubLens Team.