What's your go-to for cutting 4"X4" posts?

[Gary G™]

Building a low deck; I have a number of posts to cut off level to the top of the joists.
I usually use a circular saw but these have limited access.
I don't own a sawzall -- never had need for one.
Is the sawzall the right tool? Easy to get a straight line cutting horizontal?

[RobertJ25]

!'ve been known use a chainsaw.  A sawmill's blade wanders and flexes too much for me.

[Arlin Eastman]

Building a low deck; I have a number of posts to cut off level to the top of the joists.
I usually use a circular saw but these have limited access.
I don't own a sawzall -- never had need for one.
Is the sawzall the right tool? Easy to get a straight line cutting horizontal?

Do you have a table saw?  Even if you only had a circular saw use a with a guide on all four sides it will cut all the way thru.  Kind of like a track saw.

[SteveS]

Building a low deck; I have a number of posts to cut off level to the top of the joists.
I usually use a circular saw but these have limited access.
I don't own a sawzall -- never had need for one.
Is the sawzall the right tool? Easy to get a straight line cutting horizontal?

Sawzall is probably the right tool for difficult access.

[Gary G™]

My chainsaw is at the farm about 3 hours northwest.
I'm usually not in such a tight spot and normally do these with a circular saw.

[goaliedad]

Go to Harbor Freight or Menard's ( assuming these are options) and buy a cheap sawsall. You will use it more than you think

[badwhiskey]

Sawsalls are great. But I'd use a hand saw with an aggressive tooth design. They cut faster and easier than you would think. I've cut many 4x4s with mine.

[Admiral]

Sawsalls are great. But I'd use a hand saw with an aggressive tooth design. They cut faster and easier than you would think. I've cut many 4x4s with mine.

+1. Stanley Fatmax, at the Borg, if you pay attention and mark it out you can make it square.

[Gary G™]

I use a Vaughn Bear saw and can cut square but it feels like 105 outside. It's not just the heat; it's about 70 percent humidity.
I worked for about 6 hours and I'm done for the day. It's brutal out there.

[Eurekan]

Last time I had to do this I used the circular saw set to deepest cut then finished off with the hand saw. Worked great for me. Didn't take much time either.