Snap Frames

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Main toolbar > Curve Editor (Open) > Keys menu > Snap Frames

Graph Editor > Track View - Dope Sheet/Track View - Curve Editor > Keys menu > Snap Frames

With Snap Frames, all key and range bar positions that are changed are forced to absolute frame increments. This includes selection sets of multiple keys. When Snap Frames is on, each key in a selection set will snap to the nearest frame when the selection is moved or scaled. Default=on.

When you use the Time Display format MM:SS:Ticks, which doesn't use frames, Snap Frames snaps to time values that match frame boundaries.

In Dope Sheet > Edit Keys mode, keys are displayed as a box grid. Keys that are snapped to frames are displayed as filled boxes. Keys that have been moved with snap frames off are displayed as narrow rectangles within the grid. When using the Curve Editor, a similar display is available in the track bar.

Subframe keys moved with snap frame off

Warning: Don't turn off Snap Frames unless you have a reason to, such as the need for more precise animation timing. If you do turn off Snap Frames and move keys in Curve Editor you will create sub-frame keys, but they won't be noticeably different in Curve Editor. In some cases, sub-frame keys can lead to animation “popping,” or overly fast changes due to keys being too close together.

Procedure

To use Snap Frames:

Snap Frames is on by default, so the following procedure only applies if you have turned off snap frames previously.

On the Track View Dope Sheet toolbar, click Edit Keys.

Note: This isn't an absolute necessity, but it makes it easier to see the snapping action. You can also view the snapping in the track bar in either Dope Sheet or Curve Editor mode.
On the Track View toolbar, turn on Snap Frames.
In the Track View Key window, select one or more keys.
Use Move Keys or Scale Keys to move keys.

With Snap Frames on, each key in a selection set snaps to the nearest frame when the selection is moved or scaled.