Dobby is free.

Offend Dobby!” choked the elf. “Dobby has never been asked to sit down by a wizard — like an equal —

Oh, no, sir, no,' said Dobby, looking suddenly serious. 'Tis part of the house-elf's enslavement, sir. We keeps their secrets and our silence, sir, we upholds the family's honour, and we never speaks ill of them - though Professor Dumbledore told Dobby he does not insist upon this. Professor Dumbledore said we is free to - to' Dobby looked suddenly nervous, and beckoned Harry closer. Harry bent forwards. Dobby whispered, 'He said we is free to call him a - a barmy old codger if we likes, sir!' Dobby gave a frightened sort of giggle.

Your Wheezy, sir, your Wheezy — Wheezy who is giving Dobby his sweater!

If [Harry Potter] knew what he means to us, to the lowly, the enslaved, we dregs of the magical world! Dobby remembers how i was when He-Who-Must-No-Be-Named was at the height of his powers, sir! We house-elves were treated like vermin, sir! Of course, Dobby is still treated like that, sir, but mostly, sir, life has improved for my kind since you triumphed over He-Who-Must-Not-Be-Named. Harry Potter survived, and the Dark Lord's power was broken, and it was a new dawn, ir, and Harry Pote shone like a beacon of hope for those of us who thought the dark days would never end, sir. . . .And now, at Hogwarts, terrible things are to happen, are perhaps happening already, and Dobby cannot let Harry Potter stay here now that history is to repeat itself, now that the Chamber of Secrets is open once more -

Yes, Harry Potter!” said Dobby at once, his great eyes shining with excitement. “And if Dobby does it wrong, Dobby will throw himself off the topmost tower, Harry Potter!”
“There won’t be any need for that,” said Harry hastily.