Tennis Stroke Analyzer (Video)
Forehand, backhand and serve: speed, rotation, knee bend, compare strokes · free, no signup
See Tennis Stroke Analyzer (Video) in action
Tennis Stroke Analyzer (Video)
Load or record a tennis forehand, backhand or serve and the analyzer detects the stroke. It shows preparation and swing time, peak hitting-hand speed, shoulder and hip rotation, knee bend, head stability and contact height, with coaching notes about what to fix.
Step through the stroke in slow motion, view speed and rotation charts, and compare two strokes aligned at the moment of contact.
Key features
Detects the stroke automatically
Preparation, swing and contact.
Speed and rotation
Hand speed, shoulder–hip separation.
Knee bend and contact height
Serve and groundstrokes.
Slow-motion viewer
Skeleton overlay.
Compare two clips
Side by side.
Private
No upload.
How to use it
- Film from behind the baseline or from the side.
- Load clip A or press Record.
- Add clip B to compare.
- Review the charts and coaching notes.
Worked example
Example
Serve A: swing time 0.8 s, contact height 42 cm above shoulder. Serve B (better): 0.7 s and 55 cm.
Who uses this tool
Club and junior players
Technique feedback.
Coaches
Review lessons.
Self-taught players
Objective numbers.
Tips for the best results
- Film at hip height with the full body in view.
- Use a tripod or lean the phone on a bag.
Common mistakes to avoid
- Filming from too far away.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
Does it measure racket speed?
No. It measures your hand and arm speed; the racket head is faster.
Does it work from any camera angle?
Yes. Joint angles are measured in 3D, so front, side and diagonal views give the same readings. Keep the camera upright and your whole body in the picture.
Is my video uploaded?
No. The pose detection runs inside your browser. Nothing is recorded, uploaded or stored unless you choose to save a replay on your own device.
Is it free and private?
Yes. It is free with no signup. Everything runs in your browser and anything saved stays on your own device.