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It depends on your upload settings in Google Photos:

1. Original Quality (No Compression)
   - If you choose "Original quality," your photos and videos are uploaded in full resolution without compression.
   - These files count against your Google Drive storage quota.

2. Storage Saver (Previously High Quality) (Compressed)
   - If you choose "Storage saver", Google Photos compresses your images to save space.
   - Photos are resized to 16 MP (if they’re larger), and videos are compressed to 1080p (if they’re higher).
   - This does not count against your storage (for older accounts) but now takes up space in Google Drive for most users.

3. Express Quality (More Compression)
   - Available in some regions, this setting applies even more compression than Storage Saver.
   - Photos are resized to 3 MP, and videos are reduced to standard definition.

How to Check Your Current Setting:
1. Open Google Photos.
2. Tap your profile picture (top right).
3. Select Photos settings > Backup & sync > Upload size.

If you want to keep your images in full resolution without compression, make sure to select "Original quality."