Timecode Converter

Convert between HH:MM:SS.mmm, total seconds, and frame numbers. Supports drop-frame timecodes.

Frame Rate: Drop Frame

Timecode (HH:MM:SS.mmm)

e.g. 01:23:45.678

Total Seconds

e.g. 90.5

Frame Number

e.g. 2715

Timecode

—

Total Seconds

—

Frame Number

—

Popular uses

Match subtitles and edit pointsConvert frame numbersCheck drop-frame timing

Next tools

Video Trim Tool Subtitle Burn-in Tool Video Merger

What this tool does

Bidirectional conversion
NTSC drop-frame support
Shareable URL with parameters

How to use

1
Pick input format
HH:MM:SS / seconds / frames.
2
Pick FPS
23.976 / 24 / 29.97 / 30 / 59.94 / 60.
3
Read result
Both other formats appear automatically.

What each setting means

FPS

Frames per second. NTSC fractional rates (23.976 / 29.97 / 59.94) need drop-frame attention.

Drop-frame

Keeps NTSC timecode aligned with wall clock — used in broadcast.

Recommended settings

YouTube / SNS

30 or 60 fps, NDF

Typical web video.

Movies / drama

24 / 23.976 fps, NDF

Cinematic standards.

NTSC broadcast

29.97 fps, DF

Aligns timecode to clock time.

Common pitfalls

Symptom: Timecode drifts

Cause: Drop-frame mismatch.

Fix: Match the source DF / NDF setting.

Equivalent FFmpeg commands

Reference commands you can run on the desktop FFmpeg CLI.

Pass timecodes to FFmpeg

ffmpeg -i input.mp4 -ss 00:01:30.500 -to 00:02:00.000 -c copy output.mp4

Browser support & limits

Calculator only.

Privacy

This tool only does math in your browser. Inputs stay on your device — nothing is uploaded. Read the privacy policy →

Frequently asked questions

What is drop-frame?

A correction for NTSC 29.97fps that periodically skips frame numbers (not actual frames) to keep wall-clock alignment.

23.976 vs 24?

23.976 is the NTSC-friendly variant — they drift apart over long durations.