I'm all for that vs I'm with you

When to use each in English, with meaning, register, and examples.

I'm all for that

Beyond 10,000 (less common)

I'm with you

Top 2,000 (common)
Most common: I'm with you
 I'm all for thatI'm with you
Pronunciation🇬🇧 //aɪm ɔːl fɔː ðæt//🇺🇸 //aɪm ɔl fɔr ðæt//🇬🇧 //aɪm wɪð juː//🇺🇸 //aɪm wɪð ju//
MeaningI completely support that.I support you or agree with you.
ExampleWhen they suggested going hiking this weekend, I said, 'I'm all for that!'Whatever happens, just know that I'm with you.
RegisterNeutralNeutral
How commonBeyond 10,000 (less common)Top 2,000 (common)
Collocationsall for a cause, I'm all for it, all for changestand by someone, support someone, agree with someone
Antonyms-I'm against you, I disagree
Common mistakesConfused with 'I'm not for that', which means disagreement., Using in overly formal situations, which may feel out of place.Confuse with 'I'm against you' for opposite meaning., Use in inappropriate formal situations., Misinterpret as romantic when not intended.
Usage notesUse in conversations to express agreement or enthusiasm. It's informal but can fit in casual work discussions.Commonly used to show support. Appropriate in most casual, social, and informal contexts. Not typically used in formal writing.

See it in real clips

I'm all for that
I'm with you

Frequently asked questions: I'm all for that vs I'm with you

What's the difference between I'm all for that and I'm with you?

I'm all for that: I completely support that. I'm with you: I support you or agree with you.

Which is more common: I'm all for that and I'm with you?

I'm with you is the most common in everyday English.

Can you show an example of each?

I'm all for that: When they suggested going hiking this weekend, I said, 'I'm all for that!' I'm with you: Whatever happens, just know that I'm with you.

Can I use I'm all for that and I'm with you interchangeably?

Not always. I'm all for that and I'm with you are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.