Subtitle Quality Check
Upload your subtitle file to analyze reading speed, timing, and detect quality issues instantly.
Drop your subtitle file here or click to browse
Supported formats: SRT, VTT, ASS/SSA
Want automated QC in your workflow?
Hello8 validates reading speed, timing, segmentation and more, automatically, in 90+ languages.
Book a CallNot sure which subtitle format to use? Read our SRT vs VTT guide.
Exporting captions from Premiere Pro? Read how to proofread them.
Further reading
What is CPS in Subtitles? A Complete Guide to Characters Per Second
CPS determines whether viewers can actually read your subtitles. Learn the standards Netflix, BBC, and broadcasters enforce, and how to check your files before delivery.
Read articleProofread Premiere Pro's Auto-Generated Captions
Captions generated by Premiere Pro are a first draft. See the mistakes they leave behind, and how to fix them without touching your timings.
Read articleUsing ChatGPT to review your subtitles. The trap.
ChatGPT, Claude, and Gemini can't check timing, reading speed, or translation accuracy. Here's what AI chatbots actually miss when you paste subtitles into a chat window.
Read article