Adorable Under the Sea Birthday Invitation Templates (Editable + Free Demos!)

Planning an under the sea birthday party for your little one? You’re in the right place! Whether your kiddo is turning one, two, three, or beyond, these adorable under the sea birthday invitation templates are the perfect way to kick off the celebration. In this post, we’ll dive into six of our charming under the sea themes, each featuring two unique invitation styles.

💖 Why You’ll Love These Invitations:

• ✏️ Fully Editable: Change text, fonts, and colors right in your web browser. No software needed!
• 📄 Free Demo: Try before you buy to make sure it’s the perfect fit.
• 🎉 Any Age: Easily customize for a 1st, 2nd, 3rd, or ANY birthday year!
• 🌊 Theme Matching: Each design fits beautifully with under the sea decor and party printables.

1. 🐬 Classic Ocean Friends Theme

These invitations are all about soft pastels and gentle watercolor illustrations of cheerful sea creatures. From smiling dolphins and turtles to a cuddly whale and jellyfish, this set is lighthearted and sweet—perfect for a whimsical ocean party.

• Style 1:  Features playful watercolor sea animals like dolphins, jellyfish, and a turtle with coral details and bubbly accents. (Available Here)
• Style 2: Includes a cute pun with “Oneder the Sea” for a 1st birthday, but since the text is editable, you can personalize it for any age or phrase! (Available Here)

These designs work beautifully for toddlers and young kids, and the peaceful ocean vibes are sure to set the tone for a magical day.

2. 🐳 Deep Sea Adventure Theme

Ready for a bolder dive? This theme includes orcas, sharks, whales, and bright ocean coral for a more adventurous under the sea experience. Perfect for kids who love marine animals and want a splashier celebration.

• Style 1: “Oneder the Sea” layout surrounded by fish, sharks, and jellyfish. Great for a first birthday or customized for any age! (Available Here)
• Style 2: A vibrant “Splish Splash” headline with deep blue tones and energetic marine creatures like an orca and turtle. (Available Here)

This set adds a fun, bold twist to the undersea theme with lively colors and ocean movement.

3. 🧜‍♀️ Magical Mermaid Tail Theme

This stunning set puts a sparkly twist on the underwater celebration with a dazzling mermaid tail and shimmering pastel accents. It blends the charm of the sea with mermaid magic—perfect for kids who love a little glitter and glam!

• Style 1: “Splish Splash, It’s a Mermaid Bash” invitation with a sequined mermaid tail and dreamy sea elements like shells, starfish, and sea plants. (Available Here)
• Style 2: “Under the Sea” layout featuring the same beautiful tail design, paired with elegant typography in aqua and lavender tones. (Available Here)

It’s the ultimate under-the-sea-meets-mermaid party vibe that older kids especially love!

4. 🦦 Playful Ocean Pals Theme

This one brings in the cutest little underwater buddies! Featuring blushing seals, giggling dolphins, floating jellyfish, and pastel coral, it’s soft, sweet, and absolutely precious.

• Style 1: A dreamy “Oneder the Sea” layout with a whale, turtle, seal, and crab, perfect for a baby’s first birthday bash. (Available Here)
• Style 2: “Two the Sea” version with delicate script, allowing you to swap the age or name in seconds with the browser-based editor. (Available Here)

If you’re planning a gentle, pastel ocean party, this is your go-to set!

5. 💞 Pink Ocean Friends Theme

If you’re looking for something a little more girly and pastel-pretty, this theme is perfect! Featuring a pink whale, purple octopus, soft jellyfish, and coral-toned crab, it brings a fresh and colorful twist to the under the sea theme.

• Style 1: A cheerful “Oneder the Sea” layout in shades of pink, purple, and seafoam, with friendly ocean animals swimming around the text. (Available Here)
• Style 2: A nearly identical variation with a slightly different layout, giving you two equally adorable options to choose from. (Available Here)

This theme is great for baby girls and little ones who love bright colors and sweet sea critters!

6. 🐟 Starfish & Smiles Theme

This theme is filled with soft corals, friendly fish, happy whales, and even a few dancing starfish. It’s light, bright, and full of charm—a lovely option for birthdays during warmer months.

• Style 1: “Two the Sea” invitation with underwater cuties like a pufferfish, octopus, seahorse, and whale. (Available Here)
• Style 2: A classic “Under the Sea” headline with fun coral details, perfect for customizing with your party info. (Available Here)

This set blends playfulness and sweetness, making it a top pick for a joyful birthday bash.

🐳 Matching Under the Sea Printables

Want to keep your party theme matching? Be sure to check out our matching under the sea birthday printables! We have sets with matching banners, welcome signs, favor tags and much more:

1. 🐬 Classic Ocean Friends Theme
2. 🐳 Deep Sea Adventure Theme
3. 🧜‍♀️ Magical Mermaid Tail Theme
4. 🦦 Playful Ocean Pals Theme
5. 💞 Pink Ocean Friends Theme
6. 🐟 Starfish & Smiles Theme