Logo not crisp after resizing

[EarlGrey]

Sup ma homies

I had a logo done and it looked really crisp in the big format.
When I resized it and put it here https://www.rehabaffiliates.com it kinda lost something.

But I put the logo icon or whatever it's called here https://twitter.com/rehabaffiliates and it looks very crisp and clean.
Was resized in fireworks and optimized with tinypng

Any ideas what I have done wrong?

 

[Theo]

Do you have any hi-res source files? I would not call the twitter image crisp, the aliasing is obvious.

If you need the logo recreated in vector, send me a message, I can do it for a nominal fee.

 

[Jeroen]

Did you resize these images before you published them? That explains the aliasing like Theo pointed out.

If you have the source file (.ai, .svg for example) resize it to the required dimensions and then export to png.

 

[EarlGrey]

Yes I did resize.

I do have the source files.
For the last few years I had a team with a designer in it but I am changing the focus of my business so I am learning to do more myself at the moment.

Some things are a bit tricky and I g stuck on graphics.

I wil do what you said and try and do it from the .ai file instead of just resizing.

Thanks

 

[Jeroen]

If it doesn't work somehow...let me know.

 

[EarlGrey]

Thanks for all your help.
Much appreciates

 

[RyderSkerst]

Some image files are not correct in your image source, check at seositecheckup web tools @Discoverwebdesignperth